<PAGE>   1
                                                                   EXHIBIT 10.1
===============================================================================


                                  [CHASE LOGO]

                                CREDIT AGREEMENT

                                   dated as of

                                November 17, 1998

                                      among

                            PENNZOIL PRODUCTS COMPANY
                                   as Borrower

                            The Lenders Party Hereto

                                       and

                    CHASE BANK OF TEXAS, NATIONAL ASSOCIATION
                             as Administrative Agent

                                 CITIBANK, N.A.
                                       and
                    MORGAN GUARANTY TRUST COMPANY OF NEW YORK
                              as Syndication Agents

                                NATIONSBANK, N.A.
                             as Documentation Agent

                                       and

                        The Managing Agents and Co-Agents
                        Set Forth On Schedule 2.01 Hereto

                           ---------------------------

                             CHASE SECURITIES INC.,
                                   as Arranger

       $1,000,000,000 Revolving Credit, Term and Competitive Bid Facility

===============================================================================


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                                                                               1

                                TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                                                               Page
                                                                                                               ----
<S>                                                                                                           <C>
ARTICLE I

         Definitions..............................................................................................1
         SECTION 1.01.  Defined Terms.............................................................................1
         SECTION 1.02.  Classification of Loans and Borrowings...................................................13
         SECTION 1.03.  Terms Generally..........................................................................13
         SECTION 1.04.  Accounting Terms; GAAP...................................................................14

ARTICLE II

         The Credits.............................................................................................14
         SECTION 2.01.  Commitments..............................................................................14
         SECTION 2.02.  Loans and Borrowings.....................................................................14
         SECTION 2.03.  Requests for Revolving Borrowings........................................................15
         SECTION 2.04.  Competitive Bid Procedure................................................................16
         SECTION 2.05.  Letters of Credit........................................................................18
         SECTION 2.06.  Funding of Borrowings....................................................................21
         SECTION 2.07.  Interest Elections.......................................................................22
         SECTION 2.08.  Termination and Reduction of Commitments.................................................23
         SECTION 2.09.  Repayment of Loans; Evidence of Debt.....................................................24
         SECTION 2.10.  Prepayment of Loans......................................................................25
         SECTION 2.11.  Fees.....................................................................................26
         SECTION 2.12.  Interest.................................................................................27
         SECTION 2.13.  Alternate Rate of Interest...............................................................28
         SECTION 2.14.  Increased Costs..........................................................................28
         SECTION 2.15.  Break Funding Payments...................................................................29
         SECTION 2.16.  Taxes....................................................................................30
         SECTION 2.17.  Payments Generally; Pro Rata Treatment; Sharing of Set-offs..............................31
         SECTION 2.18.  Mitigation Obligations...................................................................33
         SECTION 2.19.  Limitation of Compensation if Applicable Lending Office is Changed.......................33

ARTICLE III

         Representations and Warranties..........................................................................33
         SECTION 3.01.  Organization; Powers.....................................................................33
         SECTION 3.02.  Authorization; Enforceability............................................................34
         SECTION 3.03.  Governmental Approvals; No Conflicts.....................................................34
         SECTION 3.04.  No Material Adverse Change...............................................................34
         SECTION 3.05.  Litigation and Environmental Matters.....................................................34
         SECTION 3.06.  Compliance with Laws and Agreements......................................................34
         SECTION 3.07.  Investment and Holding Company Status....................................................35
</TABLE>


<PAGE>   3



                                                                               2
<TABLE>
<CAPTION>
<S>                                                                                                           <C>
         SECTION 3.08.  Taxes....................................................................................35
         SECTION 3.09.  ERISA....................................................................................35
         SECTION 3.10.  Financial Information....................................................................35
         SECTION 3.11.  Year 2000................................................................................36
         SECTION 3.12.  Credit Utilization.......................................................................36

ARTICLE IV

         Conditions..............................................................................................36
         SECTION 4.01.  Effective Date...........................................................................36
         SECTION 4.02.  Each Credit Event........................................................................37

ARTICLE V

         Affirmative Covenants...................................................................................38
         SECTION 5.01.  Financial Statements and Other Information...............................................38
         SECTION 5.02.  Notices of Material Events...............................................................38
         SECTION 5.03.  Existence; Conduct of Business...........................................................39
         SECTION 5.04.  Payment of Obligations...................................................................39
         SECTION 5.05.  Maintenance of Properties; Insurance.....................................................39
         SECTION 5.06.  Books and Records; Inspection Rights.....................................................40
         SECTION 5.07.  Compliance with Laws.....................................................................40
         SECTION 5.08.  Use of Proceeds and Letters of Credit....................................................40
         SECTION 5.09.  Covenant Cross-Default...................................................................40

ARTICLE VI

         Negative Covenants......................................................................................41
         SECTION 6.01.  Liens....................................................................................41
         SECTION 6.02.  Fundamental Changes......................................................................42
         SECTION 6.03.  Investments, Loans, Advances, Guarantees and Acquisitions................................43

ARTICLE VII

         Events of Default.......................................................................................43

ARTICLE VIII

         The Administrative Agent................................................................................45

ARTICLE IX

         Miscellaneous...........................................................................................47
         SECTION 9.01.  Notices..................................................................................47
         SECTION 9.02.  Waivers; Amendments......................................................................48
         SECTION 9.03.  Expenses; Indemnity; Damage Waiver.......................................................48
</TABLE>

 

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                                                                               3
<TABLE>
<CAPTION>
<S>                                                                                                           <C>
         SECTION 9.04.  Successors and Assigns...................................................................50
         SECTION 9.05.  Survival.................................................................................52
         SECTION 9.06.  Counterparts; Integration; Effectiveness.................................................52
         SECTION 9.07.  Severability.............................................................................52
         SECTION 9.08.  Right of Setoff..........................................................................53
         SECTION 9.09.  Governing Law; Jurisdiction; Consent to Service of Process...............................53
         SECTION 9.10.  WAIVER OF JURY TRIAL.....................................................................53
         SECTION 9.11.  Headings.................................................................................54
         SECTION 9.12.  Confidentiality..........................................................................54
         SECTION 9.13.  Interest Rate Limitation.................................................................54
</TABLE>

SCHEDULES:

Schedule 2.01 -- Commitments

EXHIBITS:

Exhibit A -- Form of Assignment and Acceptance
Exhibit B -- Form of Opinion of Borrower's Counsel

 

<PAGE>   5



                                                                               1

         CREDIT AGREEMENT dated as of November 17, 1998, among PENNZOIL PRODUCTS
COMPANY (to be renamed Pennzoil - Quaker State Company), a Delaware corporation,
the LENDERS party hereto (the "Lenders"), and CHASE BANK OF TEXAS, NATIONAL
ASSOCIATION, as Administrative Agent (the "Administrative Agent").

                  The parties hereto agree as follows:


                                    ARTICLE I

                                   Definitions

                  SECTION 1.01. Defined Terms. As used in this Agreement, the
following terms have the meanings specified below:

                  "ABR", when used in reference to any Loan or Borrowing, refers
to whether such Loan, or the Loans comprising such Borrowing, are bearing
interest at a rate determined by reference to the Alternate Base Rate.

                  "Adjusted LIBO Rate" means, with respect to any Eurodollar
Borrowing of Committed Loans for any Interest Period, an interest rate per annum
(rounded upwards, if necessary, to the next 1/100 of 1%) equal to (a) the LIBO
Rate for such Interest Period multiplied by (b) the Statutory Reserve Adjustment
Factor.

                  "Administrative Agent" means Chase Bank of Texas, National
Association, in its capacity as administrative agent for the Lenders hereunder.

                  "Administrative Questionnaire" means an Administrative
Questionnaire in a form supplied by the Administrative Agent.

                  "Affiliate" means, with respect to a specified Person, another
Person that directly, or indirectly through one or more intermediaries, Controls
or is Controlled by or is under common Control with the Person specified.

                  "Agreement " means this Credit Agreement, as the same may,
from time to time be amended or supplemented.

                  "Alternate Base Rate" means, for any day, a rate per annum
equal to the greater of (a) the Prime Rate in effect on such day, and (b) the
Federal Funds Effective Rate in effect on such day plus 1/2 of 1%. Any change in
the Alternate Base Rate due to a change in the Prime Rate or the Federal Funds
Effective Rate shall be effective from and including the effective date of such
change in the Prime Rate or the Federal Funds Effective Rate, respectively.

                  "Applicable Percentage" means, with respect to any Lender, the
percentage of the total Commitments represented by such Lender's Commitment. If
the Commitments have terminated or expired, the Applicable Percentage for any
Lender shall be the percentage of the total Committed Credit

 

<PAGE>   6



                                                                               2

Exposure of all Lenders represented by such Lender's Committed Credit Exposure,
in each case as of the date of determination.

                  "Applicable Rate" means, for any day, with respect to (a) the
facility fees payable hereunder, a rate per annum equal to 0.1%, (b) any
Eurodollar Revolving Loan, the applicable rate per annum set forth below under
the caption "Eurodollar Spread" based upon the Utilization Factor as of such
date, and (c) any Eurodollar Term Loan, the applicable rate per annum set forth
below under the caption "Eurodollar Spread" based upon the Utilization Factor in
effect immediately prior to conversion of the Revolving Loans to Term Loans
pursuant to Section 2.02(e):


<TABLE>
<CAPTION>

              ====================================================
                                                   Eurodollar
                     Utilization Factor:             Spread
              ----------------------------------------------------
<S>                  <C>                           <C>

                       less than 0.5                  0.325%

              ----------------------------------------------------

                     equal to or greater              0.4%
                          than 0.5
              ====================================================
</TABLE>

The term "Utilization Factor" means, for any day, the quotient of (i) the
aggregate amount of the Lenders' Revolving Credit Exposure on such day divided
by (ii) the aggregate amount of the Lenders' Commitments on such day

                  "Assignment and Acceptance" means an assignment and acceptance
entered into by a Lender and an assignee (with the consent of any party whose
consent is required by Section 9.04), and accepted by the Administrative Agent,
in the form of Exhibit A or any other form approved by the Administrative Agent.

                  "Availability Period"means the period from and including the
Effective Date to but excluding the earlier of the Revolving Loan Maturity Date
and the date of termination of the Commitments.

                  "Board" means the Board of Governors of the Federal Reserve
System of the United States of America.

                  "Borrower" means Pennzoil Products Company, a Delaware
corporation, which shall be renamed Pennzoil - Quaker State Company.

                  "Borrowing" means (a) Committed Loans of the same Type, made,
converted or continued on the same date and, in the case of Eurodollar Loans, as
to which a single Interest Period is in effect, or (b) a Competitive Loan or
group of Competitive Loans of the same Type made on the same date and as to
which a single Interest Period is in effect.


 

<PAGE>   7



                                                                               3

                  "Borrowing Request" means a request by the Borrower for a
Revolving Borrowing in accordance with Section 2.03.

                  "Business Day" means any day that is not a Saturday, Sunday or
other day on which commercial banks in New York City or Houston, Texas are
authorized or required by law to remain closed; provided that, when used in
connection with a Eurodollar Loan, the term "Business Day" shall also exclude
any day on which banks are not open for dealings in dollar deposits in the
London interbank market.

                  "Capital Lease Obligations" of any Person means the
obligations of such Person to pay rent or other amounts under any lease of (or
other arrangement conveying the right to use) real or personal property, or a
combination thereof, which obligations are required to be classified and
accounted for as capital leases on a balance sheet of such Person under GAAP,
and the amount of such obligations shall be the capitalized amount thereof
determined in accordance with GAAP.

                  "Change in Law" means (a) the adoption of any law, rule or
regulation after the date of this Agreement, (b) any change in any law, rule or
regulation or in the interpretation or application thereof by any Governmental
Authority after the date of this Agreement or (c) compliance by any Lender or
the Issuing Bank (or, for purposes of Section 2.14(b), by any lending office of
such Lender or by such Lender's or the Issuing Bank's holding company, if any)
with any request, guideline or directive (whether or not having the force of
law) of any Governmental Authority made or issued after the date of this
Agreement; excluding, in any event, Changes in Law resulting in any increase in
Excluded Taxes.

                  "Charges" has the meaning assigned to such term in Section
9.13.

                  "Class", when used in reference to any Loan or Borrowing,
refers to whether such Loan, or the Loans comprising such Borrowing, are
Committed Loans or Competitive Loans.

                  "Code" means the Internal Revenue Code of 1986, as amended
from time to time.

                  "Committed Credit Exposure" means, with respect to any Lender
at any time, the sum of the outstanding principal amount of such Lender's
Committed Loans and its LC Exposure at such time.

                  "Committed Loan" means a Revolving Loan or a Term Loan.

                  "Commitment" means, with respect to each Lender, the
commitment of such Lender to make Revolving Loans, to acquire participations in
Letters of Credit hereunder and to convert the Revolving Loans outstanding on
the Revolving Loan Maturity Date to Term Loans, expressed as an amount
representing the maximum aggregate amount of such Lender's Revolving Credit
Exposure hereunder, as such commitment may be (a) reduced from time to time
pursuant to Section 2.08, (b) reduced or increased from time to time pursuant to
assignments by or to such Lender pursuant to Section 9.04, and (c) limited
pursuant to Section 2.20 prior to termination of the Quaker State Credit
Facility and the merger of Quaker State Corporation and a Wholly Owned
Subsidiary of the Borrower. The initial amount of each Lender's Commitment is
set forth on Schedule 2.01, or in the Assignment and

 

<PAGE>   8



                                                                               4

Acceptance pursuant to which such Lender shall have assumed its Commitment, as
applicable. The initial aggregate amount of the Lenders' Commitments is
$1,000,000,000.

                  "Competitive Bid" means an offer by a Lender to make a
Competitive Loan in accordance with Section 2.04.

                  "Competitive Bid Rate" means, with respect to any Competitive
Bid, the Margin or the Fixed Rate, as applicable, offered by the Lender making
such Competitive Bid.

                  "Competitive Bid Request" means a request by the Borrower for
Competitive Bids in accordance with Section 2.04.

                  "Competitive Loan" means a Loan made pursuant to Section 2.04.

                  "Consolidated Net Tangible Assets" means the total amount of
assets, including all cash received from asset sales during the 12 months prior
to the date of determination to the extent that such cash has not been
reinvested, of the Borrower and its Subsidiaries on a consolidated basis (less
applicable reserves and other properly deductible items) after deducting
therefrom (a) all current liabilities (excluding any which are, by their terms,
extendable or renewable at the option of the obligor thereon to a time more than
12 months after the time as of which the amount thereof is being computed) and
(b) all goodwill, trade names, trademarks, patents, unamortized debt premium or
discount and expense and other like intangible assets, determined in accordance
with GAAP.

                  "Control" means the possession, directly or indirectly, of the
power to direct or cause the direction of the management or policies of a
Person, whether through the ability to exercise voting power, by contract or
otherwise. "Controlling" and "Controlled" have meanings correlative thereto.

                  "Debt Securities Offering" means either a public offering of
debt securities registered pursuant to the Securities Act, or a private
placement of debt securities (other than commercial paper) exempted from
registration under the Securities Act and issued pursuant to Rule 144A
promulgated by the Securities and Exchange Commission.

                  "Default" means any event or condition which constitutes an
Event of Default or which upon notice, lapse of time or both would, unless cured
or waived, become an Event of Default.

                  "De Minimis Subsidiary" means any Subsidiary of the Borrower
whose percentage of Consolidated Net Tangible Assets represented by such
Subsidiary's portion of Consolidated Net Tangible Assets (before intercompany
eliminations) is less than 1% as of the end of the most recently-completed
fiscal quarter.

                  "dollars" or "$" refers to lawful money of the United States
of America.

                  "Duff & Phelps" means Duff & Phelps Credit Rating Company.



<PAGE>   9


                                                                               5

                  "Early Termination Date" means the fourth Business Day after
the first to occur of the initial Borrowing and the initial issuance of
commercial paper supported by the availability of Loan proceeds.

                  "Effective Date" means the date on which the conditions
specified in Section 4.01 are satisfied (or waived in accordance with Section
9.02).

                  "Environmental Laws" means all laws, rules, regulations,
codes, ordinances, orders, decrees, judgments, injunctions, notices or binding
agreements issued, promulgated or entered into by any Governmental Authority,
relating in any way to the environment, preservation or reclamation of natural
resources, the management, release or threatened release of any Hazardous
Material or to health and safety matters.

                  "Environmental Liability" means any liability, contingent or
otherwise (including any liability for damages, costs of environmental
remediation, fines, penalties or indemnities), of the Borrower or any Subsidiary
directly or indirectly resulting from or based upon (a) violation of any
Environmental Law, (b) the generation, use, handling, transportation, storage,
treatment or disposal of any Hazardous Materials, (c) exposure to any Hazardous
Materials, (d) the release or threatened release of any Hazardous Materials into
the environment or (e) any contract, agreement or other consensual arrangement
pursuant to which liability is assumed or imposed with respect to any of the
foregoing.

                  "ERISA" means the Employee Retirement Income Security Act of
1974, as amended from time to time.

                  "ERISA Affiliate" means any trade or business (whether or not
incorporated) that, together with the Borrower, is treated as a single employer
under Section 414(b) or (c) of the Code or, solely for purposes of Section 302
of ERISA and Section 412 of the Code, is treated as a single employer under
Section 414 of the Code.

                  "ERISA Event" means (a) any "reportable event", as defined in
Section 4043 of ERISA or the regulations issued thereunder with respect to a
Plan (other than an event for which the 30-day notice period is waived); (b) the
existence with respect to any Plan of an "accumulated funding deficiency" (as
defined in Section 412 of the Code or Section 302 of ERISA), whether or not
waived; (c) the filing pursuant to Section 412(d) of the Code or Section 303(d)
of ERISA of an application for a waiver of the minimum funding standard with
respect to any Plan; (d) the incurrence by the Borrower or any of its ERISA
Affiliates of any liability under Title IV of ERISA with respect to the
termination of any Plan; (e) the receipt by the Borrower or any ERISA Affiliate
from the PBGC or a plan administrator of any notice relating to an intention to
terminate any Plan or Plans or to appoint a trustee to administer any Plan; (f)
the incurrence by the Borrower or any of its ERISA Affiliates of any liability
with respect to the withdrawal or partial withdrawal from any Plan or
Multiemployer Plan; or (g) the receipt by the Borrower or any ERISA Affiliate of
any notice, or the receipt by any Multiemployer Plan from the Borrower or any
ERISA Affiliate of any notice, concerning the imposition of Withdrawal Liability
or a determination that a Multiemployer Plan is, or is expected to be, insolvent
or in reorganization, within the meaning of Title IV of ERISA.


 

<PAGE>   10



                                                                               6

                  "Eurodollar", when used in reference to any Loan or Borrowing,
refers to whether such Loan, or the Loans comprising such Borrowing, are bearing
interest at a rate determined by reference to the Adjusted LIBO Rate (or, in the
case of a Competitive Loan, the LIBO Rate).

                  "Event of Default" has the meaning assigned to such term in
Article VII.

                  "Exchange Act" means the Securities Exchange Act of 1934, as
amended

                  "Excluded Taxes" means, with respect to the Administrative
Agent, any Lender, the Issuing Bank or any other recipient of any payment to be
made by or on account of any obligation of the Borrower hereunder, (a) income or
franchise taxes (including penalties and interest payable in respect thereof)
imposed on (or measured by) its net income by the United States of America, or
by the jurisdiction under the laws of which such recipient is organized or in
which its principal office is located or, in the case of any Lender, in which
its applicable lending office is located, (b) any branch profits taxes imposed
by the United States of America or any similar tax imposed by any other
jurisdiction in which the Borrower is located and (c) in the case of a Foreign
Lender (other than an assignee pursuant to a request by the Borrower under
Section 2.08(e)), any withholding tax that is imposed on amounts payable to such
Foreign Lender at the time such Foreign Lender becomes a party to this Agreement
(or designates a new lending office) or is attributable to such Foreign Lender's
failure to comply with Section 2.16(e), except to the extent that such Foreign
Lender (or its assignor, if any) was entitled, at the time of designation of a
new lending office (or assignment), to receive additional amounts from the
Borrower with respect to such withholding tax pursuant to Section 2.16(a).

                  "Federal Funds Effective Rate" means, for any day, the
weighted average (rounded upwards, if necessary, to the next 1/100 of 1%) of the
rates on overnight Federal funds transactions with members of the Federal
Reserve System arranged by Federal funds brokers, as published on the next
succeeding Business Day by the Federal Reserve Bank of New York, or, if such
rate is not so published for any day that is a Business Day, the average
(rounded upwards, if necessary, to the next 1/100 of 1%) of the quotations for
such day for such transactions received by the Administrative Agent from three
Federal funds brokers of recognized standing selected by it.

                  "Final Maturity Date" means November 16, 2000.

                  "Financial Officer" means the chief financial officer,
treasurer, any assistant treasurer or controller of the Borrower.

                  "Fixed Rate" means, with respect to any Competitive Loan
(other than a Eurodollar Competitive Loan), the fixed rate of interest per annum
specified by the Lender making such Competitive Loan in its related Competitive
Bid.

                  "Fixed Rate Loan" means a Competitive Loan bearing interest at
a Fixed Rate.

                  "Foreign Lender" means any Lender that is organized under the
laws of a jurisdiction other than that in which the Borrower is located. For
purposes of this definition, the United States of America, each State thereof
and the District of Columbia shall be deemed to constitute a single
jurisdiction.

 

<PAGE>   11



                                                                               7


                  "GAAP" means generally accepted accounting principles in the
United States of America.

                  "Governmental Authority" means the government of the United
States of America, any other nation or any political subdivision thereof,
whether state or local, and any agency, authority, instrumentality, regulatory
body, court, central bank or other entity exercising executive, legislative,
judicial, taxing, regulatory or administrative powers or functions of or
pertaining to government.

                  "Guarantee" of or by any Person (the "guarantor") means any
obligation, contingent or otherwise, of the guarantor guaranteeing or having the
economic effect of guaranteeing any Indebtedness or other obligation of any
other Person (the "primary obligor") in any manner, whether directly or
indirectly, and including any obligation of the guarantor, direct or indirect,
(a) to purchase or pay (or advance or supply funds for the purchase or payment
of) such Indebtedness or other obligation or to purchase (or to advance or
supply funds for the purchase of) any security for the payment thereof, (b) to
purchase or lease property, securities or services for the purpose of assuring
the owner of such Indebtedness or other obligation of the payment thereof, (c)
to maintain working capital, equity capital or any other financial statement
condition or liquidity of the primary obligor so as to enable the primary
obligor to pay such Indebtedness or other obligation or (d) as an account party
in respect of any letter of credit or letter of guaranty issued to support such
Indebtedness or obligation; provided, that the term Guarantee shall not include
endorsements for collection or deposit in the ordinary course of business.

                  "Hazardous Materials" means all explosive or radioactive
substances or wastes and all hazardous or toxic substances, wastes or other
pollutants, including petroleum or petroleum distillates, asbestos or asbestos
containing materials, polychlorinated biphenyls, radon gas, infectious or
medical wastes and all other substances or wastes of any nature regulated
pursuant to any Environmental Law.

                  "Indebtedness" of any Person means, without duplication, (a)
all obligations of such Person for borrowed money or with respect to deposits or
advances of any kind, (b) all obligations of such Person evidenced by bonds,
debentures, notes or similar instruments, (c) all obligations of such Person
upon which interest charges are customarily paid, (d) all obligations of such
Person under conditional sale or other title retention agreements relating to
property acquired by such Person, (e) all obligations of such Person in respect
of the deferred purchase price of property or services (excluding current
accounts payable incurred in the ordinary course of business), (f) all
Indebtedness of others secured by (or for which the holder of such Indebtedness
has an existing right, contingent or otherwise, to be secured by) any Lien on
property owned or acquired by such Person, whether or not the Indebtedness
secured thereby has been assumed, (g) all Guarantees by such Person of
Indebtedness of others, (h) all Capital Lease Obligations of such Person, (i)
all obligations, contingent or otherwise, of such Person as an account party in
respect of letters of credit and letters of guaranty and (j) all obligations,
contingent or otherwise, of such Person in respect of bankers' acceptances. The
Indebtedness of any Person shall include the Indebtedness of any other entity
(including any partnership in which such Person is a general partner) to the
extent such Person is liable therefor as a result of such Person's ownership
interest in or other relationship with such entity, except to the extent the
terms of such Indebtedness provide that such Person is not liable therefor.

                  "Indemnified Taxes" means Taxes other than Excluded Taxes.


 

<PAGE>   12



                                                                               8

                  "Index Debt" means senior, unsecured, long-term indebtedness
for borrowed money of the Borrower that is not guaranteed by any other Person or
subject to any other credit enhancement.

                  "Information Memorandum" means the Confidential Information
Memorandum dated August 1998 relating to the Borrower and the Transactions.

                  "Interest Election Request" means a request by the Borrower to
convert or continue a Committed Borrowing in accordance with Section 2.08.

                  "Interest Payment Date" means (a) with respect to any ABR
Loan, the last day of each March, June, September and December, (b) with respect
to any Eurodollar Loan, the last day of the Interest Period applicable to the
Borrowing of which such Loan is a part and, in the case of a Eurodollar
Borrowing with an Interest Period of more than three months' duration, each day
prior to the last day of such Interest Period that occurs at intervals of three
months' duration after the first day of such Interest Period, and (c) with
respect to any Fixed Rate Loan, the last day of the Interest Period applicable
to the Borrowing of which such Loan is a part and, in the case of a Fixed Rate
Borrowing with an Interest Period of more than 90 days' duration (unless
otherwise specified in the applicable Competitive Bid Request), each day prior
to the last day of such Interest Period that occurs at intervals of 90 days'
duration after the first day of such Interest Period, and any other dates that
are specified in the applicable Competitive Bid Request as Interest Payment
Dates with respect to such Borrowing.

                  "Interest Period" means (a) with respect to any Eurodollar
Borrowing, the period commencing on the date of such Borrowing and ending on the
numerically corresponding day in the calendar month that is one, two, three or
six months (or, with the consent of each Lender, nine or twelve months)
thereafter, as the Borrower may elect, (b) with respect to any Fixed Rate
Borrowing, the period (which shall not be less than 1 day or more than 360 days)
commencing on the date of such Borrowing and ending on the date specified in the
applicable Competitive Bid Request; provided, that (i) if any Interest Period
would end on a day other than a Business Day, such Interest Period shall be
extended to the next succeeding Business Day unless, in the case of a Eurodollar
Borrowing only, such next succeeding Business Day would fall in the next
calendar month, in which case such Interest Period shall end on the next
preceding Business Day and (ii) any Interest Period pertaining to a Eurodollar
Borrowing that commences on the last Business Day of a calendar month (or on a
day for which there is no numerically corresponding day in the last calendar
month of such Interest Period) shall end on the last Business Day of the last
calendar month of such Interest Period. For purposes hereof, the date of a
Borrowing initially shall be the date on which such Borrowing is made and, in
the case of a Committed Borrowing, thereafter shall be the effective date of the
most recent conversion or continuation of such Borrowing.

                  "Issuing Bank" means either Chase Bank of Texas, National
Association or The Chase Manhattan Bank, in its capacity as the issuer of
Letters of Credit hereunder, and its successors in such capacity as provided in
Section 2.05(i).

                  "LC Disbursement" means a payment made by the Issuing Bank
pursuant to a Letter of Credit.


 

<PAGE>   13



                                                                               9

                  "LC Exposure" means, at any time, the sum of (a) the aggregate
undrawn amount of all outstanding Letters of Credit at such time plus (b) the
aggregate amount of all LC Disbursements that have not yet been reimbursed by or
on behalf of the Borrower at such time. The LC Exposure of any Lender at any
time shall be its Applicable Percentage of the total LC Exposure at such time.

                  "Lenders" means the Persons listed on Schedule 2.01 and any
other Person that shall have become a party hereto pursuant to an Assignment and
Acceptance, other than any such Person that ceases to be a party hereto pursuant
to an Assignment and Acceptance.

                  "Letter of Credit" means any letter of credit issued pursuant
to this Agreement.

                  "LIBO Rate" means, with respect to any Eurodollar Borrowing
for any Interest Period, the rate appearing on Page 3750 of the Telerate Service
(or on any successor or substitute page of such Service, or any successor to or
substitute for such Service, providing rate quotations comparable to those
currently provided on such page of such Service, as determined by the
Administrative Agent from time to time for purposes of providing quotations of
interest rates applicable to dollar deposits in the London interbank market) at
approximately 11:00 a.m., London time, two Business Days prior to the
commencement of such Interest Period, as the rate for dollar deposits with a
maturity comparable to such Interest Period. In the event that such rate is not
available at such time for any reason, then the "LIBO Rate" with respect to such
Eurodollar Borrowing for such Interest Period shall be the rate at which dollar
deposits of $5,000,000 and for a maturity comparable to such Interest Period are
offered by the principal London office of the Administrative Agent in
immediately available funds in the London interbank market at approximately
11:00 a.m., London time, two Business Days prior to the commencement of such
Interest Period.

                  "Lien" means, with respect to any asset, (a) any mortgage,
deed of trust, lien, pledge, hypothecation, encumbrance, charge or security
interest in, on or of such asset and (b) the interest of a vendor or a lessor
under any conditional sale agreement, capital lease or title retention agreement
(or any financing lease having substantially the same economic effect as any of
the foregoing) relating to such asset.

                  "Loans" means the loans made by the Lenders to the Borrower
pursuant to this Agreement.

                  "Margin" means, with respect to any Competitive Loan bearing
interest at a rate based on the LIBO Rate, the marginal rate of interest, if
any, to be added to or subtracted from the LIBO Rate to determine the rate of
interest applicable to such Loan, as specified by the Lender making such Loan in
its related Competitive Bid.

                  "Material Adverse Effect" means a material adverse effect on
(a) the business, assets, operations or condition, financial or otherwise, of
the Borrower and the Subsidiaries taken as a whole, (b) the ability of the
Borrower to perform any of its obligations under this Agreement or (c) the
rights of or benefits available to the Lenders under this Agreement.

                  "Material Indebtedness" means Indebtedness of any one or more
of the Borrower and its Subsidiaries in an aggregate principal amount exceeding
$50,000,000 of the type described in (i)

 

<PAGE>   14



                                                                              10

clauses (a) and (b) of the definition of Indebtedness and (ii) clause (g) of the
definition of Indebtedness (to the extent that clause (g) relates to
Indebtedness described in clauses (a) or (b) of such definition), but excluding
the Loans and Letters of Credit.

                  "Material Subsidiary" means each of (a) any Subsidiary of the
Borrower whose percentage of the Consolidated Net Tangible Assets represented by
such Subsidiary's portion of such Consolidated Net Tangible Assets (after
intercompany eliminations) exceeds 10% as of the end of the most
recently-completed fiscal quarter, and (b) any other Subsidiary which at the
time shall have been designated by the Borrower as a Material Subsidiary in an
officers' certificate delivered to the Administrative Agent for such purpose. As
of the Closing Date, the only Subsidiary of the Borrower that qualifies as a
Material Subsidiary under clause (a) above is Jiffy Lube International, Inc., a
Delaware corporation. As of the date of the merger of Quaker State Corporation
and a Wholly Owned Subsidiary of the Borrower, Quaker State Corporation will
also qualify as a Material Subsidiary under clause (a) above. On or about
January 1, 1999, the Borrower intends to cause Quaker State Corporation to
distribute all or substantially all of its assets to the Borrower and, after
such distribution has been consummated, it is anticipated that Quaker State
Corporation will no longer qualify as a Material Subsidiary.

                  "Maximum Rate" has the meaning assigned to such term in
Section 9.13.

                  "Moody's" means Moody's Investors Service, Inc.

                  "Multiemployer Plan" means a multiemployer plan as defined in
Section 4001(a)(3) of ERISA.

                  "Other Taxes" means any and all present or future stamp or
documentary taxes or any other excise or property taxes, charges or similar
levies arising from any payment made hereunder or from the execution, delivery
or enforcement of, or otherwise with respect to, this Agreement.

                  "PBGC" means the Pension Benefit Guaranty Corporation referred
to and defined in ERISA and any successor entity performing similar functions.

                  "PennzEnergy Credit Facility" means that certain Credit
Agreement dated as of November 17, 1998, among Pennzoil Company, the lenders
parties thereto, Chase Bank of Texas, National Association, as Administrative
Agent and the other agents and co-agents referenced therein.

                  "PennzEnergy Effective Date" has the meaning assigned to the
term "Effective Date" in the PennzEnergy Credit Facility.

                  "Permitted Investments" means:

                  (a) direct obligations of, or obligations on which the
         principal of and interest are unconditionally guaranteed by, the United
         States of America (or by any agency thereof to the extent such
         obligations are backed by the full faith and credit of the United
         States of America), in each case maturing within one year from the date
         of acquisition thereof;


 

<PAGE>   15



                                                                              11

                  (b) investments in commercial paper maturing within 270 days
         from the date of acquisition thereof and having, at such date of
         acquisition, the highest credit rating obtainable from S&P, from
         Moody's or from Duff & Phelps;

                  (c) investments in certificates of deposit, banker's
         acceptances and time deposits maturing within 180 days from the date of
         acquisition thereof issued or guaranteed by or placed with, and money
         market deposit accounts issued or offered by, any domestic office of
         any commercial bank organized under the laws of the United States of
         America or any State thereof which has a combined capital and surplus
         and undivided profits of not less than $1,000,000,000; and

                  (d) fully collateralized repurchase agreements with a term of
         not more than 30 days for securities described in clause (a) above and
         entered into with a financial institution satisfying the criteria
         described in clause (c) above.

                  "Person" means any natural person, corporation, limited
liability company, trust, joint venture, association, company, partnership,
Governmental Authority or other entity.

                  "Plan" means any employee pension benefit plan (other than a
Multiemployer Plan) subject to the provisions of Title IV of ERISA or Section
412 of the Code or Section 302 of ERISA, and in respect of which the Borrower or
any ERISA Affiliate is (or, if such plan were terminated, would under Section
4069 of ERISA be deemed to be) an "employer" as defined in Section 3(5) of
ERISA.

                  "Prime Rate" means the rate of interest per annum publicly
announced from time to time by Chase Bank of Texas, National Association as its
prime rate in effect at its principal office in Houston, Texas; each change in
the Prime Rate shall be effective from and including the date such change is
publicly announced as being effective.

                  "Prior Credit Facility" means that certain Amended and
Restated Revolving Credit Agreement dated as of August 20, 1993 by and among
Pennzoil Company, the banking institutions party thereto and Chase Bank of
Texas, National Association (f/k/a Texas Commerce Bank National Association), as
Administrative Agent, as amended from time to time.

                  "Prior Credit Facility Termination" shall have occurred at
such time as the Prior Credit Facility has been terminated, all Indebtedness
owing thereunder has been repaid in full, and all "Commitments" thereunder (as
defined therein) have been irrevocably terminated.

                  "Quaker State Credit Facility" means that certain Credit
Agreement dated as of June 12, 1997, among Quaker State Corporation, the banks
parties thereto and Morgan Guaranty Trust Company of New York, as Agent, as
amended from time to time.

                  "Quaker State Credit Facility Termination" shall have occurred
at such time as the Quaker State Credit Facility has been terminated, all
Indebtedness owing thereunder has been repaid in full, and all "Commitments"
thereunder (as defined therein) have been irrevocably terminated.


 

<PAGE>   16



                                                                              12

                  "Quaker State Cross Defaults" means the cross default
provisions contained in Section 501(4) of the Indenture dated October 23, 1995
between Quaker State Corporation and Chemical Bank, as Trustee, relating to
$100,000,000 6 5/8% Notes due 2005 and Sections 6.01(e), (f), (i) and (j) of the
Quaker State Credit Facility.

                  "Register" has the meaning set forth in Section 9.04.

                  "Related Parties" means, with respect to any specified Person,
such Person's Affiliates and the respective directors, officers, employees,
agents and advisors of such Person and such Person's Affiliates.

                  "Required Lenders" means, at any time, Lenders having
Committed Credit Exposures and unused Commitments representing 66-2/3% or more
of the sum of the total Committed Credit Exposures and unused Commitments at
such time; provided that, for purposes of declaring the Loans to be due and
payable pursuant to Article VII, and for all purposes after the Loans become due
and payable pursuant to Article VII or the Commitments expire or terminate, the
outstanding Competitive Loans of the Lenders shall be added to their respective
Committed Credit Exposures and to the total Committed Credit Exposures in
determining the Required Lenders.

                  "Revolving Credit Exposure" means, with respect to any Lender
at any time, the sum of the outstanding principal amount of such Lender's
Revolving Loans and its LC Exposure at such time.

                  "Revolving Loan" means a Loan made pursuant to Section 2.03.

                  "Revolving Loan Maturity Date" means November 16, 1999.

                  "S&P" means Standard & Poor's Ratings Group, a division of The
McGraw Hill Companies, Inc.

                  "Securities Act" means the Securities Act of 1933, as amended

                  "Statutory Reserve Adjustment Factor" means a fraction
(expressed as a decimal), the numerator of which is the number one and the
denominator of which is the number one minus the aggregate of the maximum
reserve percentages (including any marginal, special, emergency or supplemental
reserves) expressed as a decimal established by the Board to which the
Administrative Agent is subject with respect to the Adjusted LIBO Rate, for
eurocurrency funding (currently referred to as "Eurocurrency Liabilities" in
Regulation D of the Board). Such reserve percentages shall include those imposed
pursuant to such Regulation D. Eurodollar Loans shall be deemed to constitute
eurocurrency funding and to be subject to such reserve requirements without
benefit of or credit for proration, exemptions or offsets that may be available
from time to time to any Lender under such Regulation D or any comparable
regulation. The Statutory Reserve Adjustment Factor shall be adjusted
automatically on and as of the effective date of any change in any reserve
percentage.

                  "subsidiary" means, with respect to any Person (the "parent")
at any date, any corporation, limited liability company, partnership,
association or other entity the accounts of which would be consolidated with
those of the parent in the parent's consolidated financial statements if such

 

<PAGE>   17



                                                                              13

financial statements were prepared in accordance with GAAP as of such date, as
well as any other corporation, limited liability company, partnership,
association or other entity (a) of which securities or other ownership interests
representing more than 50% of the equity or more than 50% of the ordinary voting
power or, in the case of a partnership, more than 50% of the general partnership
interests are, as of such date, owned, controlled or held, or (b) that is, as of
such date, otherwise Controlled, by the parent or one or more subsidiaries of
the parent or by the parent and one or more subsidiaries of the parent.

                  "Subsidiary" means any subsidiary of the Borrower.

                  "Taxes" means any and all present or future taxes, levies,
imposts, duties, deductions, charges or withholdings imposed by any Governmental
Authority.

                  "Term Loan" means a Revolving Loan that is converted to a term
Loan with a maturity of not greater than one year pursuant to Section 2.02(e).

                  "Transactions" means the execution, delivery and performance
by the Borrower of this Agreement, the borrowing of Loans, the use of the
proceeds thereof and the issuance of Letters of Credit hereunder.

                  "Type", when used in reference to any Loan or Borrowing,
refers to whether the rate of interest on such Loan, or on the Loans comprising
such Borrowing, is determined by reference to the Adjusted LIBO Rate, the
Alternate Base Rate or, in the case of a Competitive Loan or Borrowing, the LIBO
Rate or a Fixed Rate.

                  "Wholly Owned Subsidiary" means a corporation all the
outstanding voting stock (other than any directors' qualifying shares) of which
is owned, directly or indirectly, by the Borrower or by one or more other Wholly
Owned Subsidiaries, or by the Borrower and one or more other Wholly Owned
Subsidiaries. For the purposes of this definition, "voting stock" means stock
which ordinarily has voting power for the election of directors, whether at all
times or only so long as no senior class of stock has such voting power by
reason of any contingency.

                  "Withdrawal Liability" means liability to a Multiemployer Plan
as a result of a complete or partial withdrawal from such Multiemployer Plan, as
such terms are defined in Part I of Subtitle E of Title IV of ERISA.

                  SECTION 1.02. Classification of Loans and Borrowings. For
purposes of this Agreement, Loans may be classified and referred to by Class
(e.g., a "Revolving Loan") or by Type (e.g., a "Eurodollar Loan") or by Class
and Type (e.g., a "Eurodollar Revolving Loan"). Borrowings also may be
classified and referred to by Class (e.g., a "Revolving Borrowing") or by Type
(e.g., a "Eurodollar Borrowing") or by Class and Type (e.g., a "Eurodollar
Revolving Borrowing").

                  SECTION 1.03. Terms Generally. The definitions of terms herein
shall apply equally to the singular and plural forms of the terms defined.
Whenever the context may require, any pronoun shall include the corresponding
masculine, feminine and neuter forms. The words "include", "includes" and
"including" shall be deemed to be followed by the phrase "without limitation".
The word "will" shall be construed to have the same meaning and effect as the
word "shall". Unless the context requires

 

<PAGE>   18



                                                                              14

otherwise (a) any definition of or reference to any agreement, instrument or
other document herein shall be construed as referring to such agreement,
instrument or other document as from time to time amended, supplemented or
otherwise modified (subject to any restrictions on such amendments, supplements
or modifications set forth herein), (b) any reference herein to any Person shall
be construed to include such Person's successors and assigns, (c) the words
"herein", "hereof" and "hereunder", and words of similar import, shall be
construed to refer to this Agreement in its entirety and not to any particular
provision hereof, (d) all references herein to Articles, Sections, Exhibits and
Schedules shall be construed to refer to Articles and Sections of, and Exhibits
and Schedules to, this Agreement and (e) the words "asset" and "property" shall
be construed to have the same meaning and effect and to refer to any and all
tangible and intangible assets and properties, including cash, securities,
accounts and contract rights.

                  SECTION 1.04. Accounting Terms; GAAP. Except as otherwise
expressly provided herein, all terms of an accounting or financial nature shall
be construed in accordance with GAAP, as in effect from time to time; provided
that, if the Borrower notifies the Administrative Agent that the Borrower
requests an amendment to any provision hereof to eliminate the effect of any
change occurring after the date hereof in GAAP or in the application thereof on
the operation of such provision (or if the Administrative Agent notifies the
Borrower that the Required Lenders request an amendment to any provision hereof
for such purpose), regardless of whether any such notice is given before or
after such change in GAAP or in the application thereof, then such provision
shall be interpreted on the basis of GAAP as in effect and applied immediately
before such change shall have become effective until such notice shall have been
withdrawn or such provision amended in accordance herewith.


                                   ARTICLE II

                                   The Credits

                  SECTION 2.01. Commitments. Subject to the terms and conditions
set forth herein, each Lender agrees to (i) make Revolving Loans to the Borrower
from time to time during the Availability Period in an aggregate principal
amount that will not result in (a) such Lender's Revolving Credit Exposure
exceeding such Lender's Commitment or (b) the sum of the total Revolving Credit
Exposures plus the aggregate principal amount of outstanding Competitive Loans
exceeding the total Commitments; and (ii) at the election of the Borrower, to
convert the principal amount of any Revolving Loans remaining outstanding on the
Revolving Loan Maturity Date to a Term Loan. Within the foregoing limits and
subject to the terms and conditions set forth herein, the Borrower may borrow,
prepay and reborrow Revolving Loans.

                  SECTION 2.02. Loans and Borrowings. (a) Each Committed Loan
shall be made as part of a Borrowing consisting of Committed Loans made by the
Lenders ratably in accordance with their respective Commitments. Each
Competitive Loan shall be made in accordance with the procedures set forth in
Section 2.04. The failure of any Lender to make any Loan required to be made by
it shall not relieve any other Lender of its obligations hereunder; provided
that the Commitments and Competitive Bids of the Lenders are several and no
Lender shall be responsible for any other Lender's failure to make Loans as
required.

 

<PAGE>   19



                                                                              15

                  (b) Subject to Section 2.13, (i) each Committed Borrowing
shall be comprised entirely of ABR Loans or Eurodollar Loans as the Borrower may
request in accordance herewith, and (ii) each Competitive Borrowing shall be
comprised entirely of Eurodollar Loans or Fixed Rate Loans as the Borrower may
request in accordance herewith. Each Lender at its option may make any
Eurodollar Loan by causing any domestic or foreign branch or Affiliate of such
Lender to make such Loan; provided that any exercise of such option shall not
affect the obligation of the Borrower to repay such Loan in accordance with the
terms of this Agreement.

                  (c) At the commencement of each Interest Period for any
Eurodollar Committed Borrowing, such Borrowing shall be in an aggregate amount
that is an integral multiple of $1,000,000 and not less than $10,000,000;
provided that a Eurodollar Committed Borrowing may be in an aggregate amount
that is less than $10,000,000, but greater than $5,000,000, and that is equal to
the entire unused balance of the total Commitments. At the time that each ABR
Committed Borrowing is made, such Borrowing shall be in an aggregate amount that
is an integral multiple of $1,000,000 and not less than $5,000,000; provided
that an ABR Committed Borrowing may be in an aggregate amount that is equal to
the entire unused balance of the total Commitments or that is required to
finance the reimbursement of an LC Disbursement as contemplated by Section
2.05(e). Each Competitive Borrowing shall be in an aggregate amount that is an
integral multiple of $1,000,000 and not less than $15,000,000. Borrowings of
more than one Type and Class may be outstanding at the same time; provided that
there shall not at any time be more than a total of ten Eurodollar Committed
Borrowings outstanding.

                  (d) Notwithstanding any other provision of this Agreement, (i)
the Borrower shall not be entitled to request, or to elect to convert (except
for a conversion to a Term Loan pursuant to Section 2.02(e))or continue, any
Borrowing containing Revolving Loans if the Interest Period requested with
respect thereto would end after the Revolving Loan Maturity Date and (ii) the
Borrower shall not be entitled to request, or to elect to convert or continue,
any Borrowing containing Term Loans if the Interest Period requested with
respect thereto would end after the Final Maturity Date.

                  (e) At the option of the Borrower, upon written notice
delivered to the Administrative Agent no later than 10 Business Days prior to
the Revolving Loan Maturity Date, so long as no Default has occurred and is
continuing, the aggregate principal amount of any Revolving Loans remaining
outstanding at the close of the Administrative Agent's business on the Revolving
Loan Maturity Date shall automatically convert to Term Loans with a maturity of
no greater than one year. Any portion of each Lender's Commitment not utilized
on or before the Revolving Loan Maturity Date shall be permanently canceled. Any
Term Loans that are prepaid may not be reborrowed.

                  SECTION 2.03. Requests for Revolving Borrowings. To request a
Revolving Borrowing, the Borrower shall notify the Administrative Agent of such
request by telephone (a) in the case of a Eurodollar Borrowing, not later than
11:00 a.m., Houston, Texas time, three Business Days before the date of the
proposed Borrowing, or (b) in the case of an ABR Borrowing, not later than 11:00
a.m., Houston, Texas time, on the date of the proposed Borrowing; provided that
any such notice of an ABR Revolving Borrowing to finance the reimbursement of an
LC Disbursement as contemplated by Section 2.05(e) may be given not later than
10:00 a.m., Houston, Texas time, on the date of the proposed Borrowing. Each
such telephonic Borrowing Request shall be irrevocable and shall be confirmed
promptly by hand delivery or telecopy to the Administrative Agent of a written
Borrowing Request in

 

<PAGE>   20



                                                                              16

a form approved by the Administrative Agent and signed by the Borrower. Each
such telephonic and written Borrowing Request shall specify the following
information in compliance with Section 2.02:

                  (i)  the aggregate amount of the requested Borrowing;

                  (ii) the date of such Borrowing, which shall be a Business
Day;

                  (iii) whether such Borrowing is to be an ABR Borrowing or a
Eurodollar Borrowing;

                  (iv) in the case of a Eurodollar Borrowing, the initial
Interest Period to be applicable thereto, which shall be a period contemplated
by the definition of the term "Interest Period"; and

                  (v) the location and number of the Borrower's account to which
funds are to be disbursed, which shall comply with the requirements of Section
2.06.

If no election as to the Type of Revolving Borrowing is specified, then the
requested Revolving Borrowing shall be an ABR Borrowing. If no Interest Period
is specified with respect to any requested Eurodollar Revolving Borrowing, then
the Borrower shall be deemed to have selected an Interest Period of one month's
duration. Promptly following receipt of a Borrowing Request in accordance with
this Section, the Administrative Agent shall advise each Lender of the details
thereof and of the amount of such Lender's Loan to be made as part of the
requested Borrowing.

                  SECTION 2.04. Competitive Bid Procedure. (a) Subject to the
terms and conditions set forth herein, from time to time during the Availability
Period the Borrower may request Competitive Bids and may (but shall not have any
obligation to) accept Competitive Bids and borrow Competitive Loans; provided
that the sum of the total Committed Credit Exposures plus the aggregate
principal amount of outstanding Competitive Loans at any time shall not exceed
the total Commitments. To request Competitive Bids, the Borrower shall notify
the Administrative Agent of such request by telephone, in the case of a
Eurodollar Borrowing, not later than 11:00 a.m., Houston, Texas time, four
Business Days before the date of the proposed Borrowing and, in the case of a
Fixed Rate Borrowing, not later than 10:00 a.m., Houston, Texas time, one
Business Day before the date of the proposed Borrowing. Each such telephonic
Competitive Bid Request shall be confirmed promptly by hand delivery or telecopy
to the Administrative Agent of a written Competitive Bid Request in a form
approved by the Administrative Agent and signed by the Borrower. Each such
telephonic and written Competitive Bid Request shall specify the following
information in compliance with Section 2.02:

                  (i)  the aggregate amount of the requested Borrowing;

                  (ii) the date of such Borrowing, which shall be a Business
Day;

                  (iii) whether such Borrowing is to be a Eurodollar Borrowing
or a Fixed Rate Borrowing;

                  (iv) the Interest Period to be applicable to such Borrowing,
which shall be a period contemplated by the definition of the term "Interest
Period"; and


 

<PAGE>   21



                                                                              17

                  (v) the location and number of the Borrower's account to which
funds are to be disbursed, which shall comply with the requirements of Section
2.07.

Promptly following receipt of a Competitive Bid Request in accordance with this
Section, the Administrative Agent shall notify the Lenders of the details
thereof by telecopy, inviting the Lenders to submit Competitive Bids.

                  (b) Each Lender may (but shall not have any obligation to)
make one or more Competitive Bids to the Borrower in response to a Competitive
Bid Request. Each Competitive Bid by a Lender must be in a form approved by the
Administrative Agent and must be received by the Administrative Agent by
telecopy, in the case of a Eurodollar Competitive Borrowing, not later than 9:30
a.m., Houston, Texas time, three Business Days before the proposed date of such
Competitive Borrowing, and in the case of a Fixed Rate Borrowing, not later than
9:30 a.m., Houston, Texas time, on the proposed date of such Competitive
Borrowing. Competitive Bids that do not conform substantially to the form
approved by the Administrative Agent may be rejected by the Administrative
Agent, and the Administrative Agent shall notify the applicable Lender as
promptly as practicable. Each Competitive Bid shall specify (i) the principal
amount (which shall be a minimum of $15,000,000 and an integral multiple of
$1,000,000 and which may equal the entire principal amount of the Competitive
Borrowing requested by the Borrower) of the Competitive Loan or Loans that the
Lender is willing to make, (ii) the Competitive Bid Rate or Rates at which the
Lender is prepared to make such Loan or Loans (expressed as a percentage rate
per annum in the form of a decimal to no more than four decimal places) and
(iii) the Interest Period applicable to each such Loan and the last day thereof.

                  (c) The Administrative Agent shall promptly notify the
Borrower by telecopy of the Competitive Bid Rate and the principal amount
specified in each Competitive Bid and the identity of the Lender that shall have
made such Competitive Bid.

                  (d) Subject only to the provisions of this paragraph, the
Borrower may accept or reject any Competitive Bid. The Borrower shall notify the
Administrative Agent by telephone, confirmed by telecopy in a form approved by
the Administrative Agent, whether and to what extent it has decided to accept or
reject each Competitive Bid, in the case of a Eurodollar Competitive Borrowing,
not later than 10:30 a.m., Houston, Texas time, three Business Days before the
date of the proposed Competitive Borrowing, and in the case of a Fixed Rate
Borrowing, not later than 10:30 a.m., Houston, Texas time, on the proposed date
of the Competitive Borrowing; provided that (i) the failure of the Borrower to
give such notice by such required time shall be deemed to be a rejection of each
Competitive Bid, (ii) the Borrower shall not accept a Competitive Bid made at a
particular Competitive Bid Rate if the Borrower rejects a Competitive Bid made
at a lower Competitive Bid Rate, (iii) the aggregate amount of the Competitive
Bids accepted by the Borrower shall not exceed the aggregate amount of the
requested Competitive Borrowing specified in the related Competitive Bid
Request, (iv) to the extent necessary to comply with clause (iii) above, the
Borrower may accept Competitive Bids at the same Competitive Bid Rate in part,
which acceptance, in the case of multiple Competitive Bids at such Competitive
Bid Rate, shall be made pro rata in accordance with the amount of each such
Competitive Bid, and (v) except pursuant to clause (iv) above, no Competitive
Bid shall be accepted for a Competitive Loan unless such Competitive Loan is in
a minimum principal amount of $15,000,000 and an integral multiple of
$1,000,000; provided further that if a Competitive Loan must be in an amount
less than $15,000,000 because of the provisions of clause (iv) above, such
Competitive Loan may be for a minimum of

 

<PAGE>   22



                                                                              18

$1,000,000 or any integral multiple thereof, and in calculating the pro rata
allocation of acceptances of portions of multiple Competitive Bids at a
particular Competitive Bid Rate pursuant to clause (iv) the amounts shall be
rounded to integral multiples of $1,000,000 in a manner determined by the
Borrower. A notice given by the Borrower pursuant to this paragraph shall be
irrevocable.

                  (e) The Administrative Agent shall promptly notify each
bidding Lender by telecopy whether or not its Competitive Bid has been accepted
(and, if so, the amount and Competitive Bid Rate so accepted), and each
successful bidder will thereupon become bound, subject to the terms and
conditions hereof, to make the Competitive Loan in respect of which its
Competitive Bid has been accepted.

                  (f) If the Administrative Agent shall elect to submit a
Competitive Bid in its capacity as a Lender, it shall submit such Competitive
Bid directly to the Borrower at least one quarter of an hour earlier than the
time by which the other Lenders are required to submit their Competitive Bids to
the Administrative Agent pursuant to paragraph (b) of this Section.

                  SECTION 2.05. Letters of Credit. (a) General. Subject to the
terms and conditions set forth herein, the Borrower may request the issuance of
Letters of Credit for its own account, in a form reasonably acceptable to the
Administrative Agent and the Issuing Bank, at any time and from time to time
during the Availability Period. In the event of any inconsistency between the
terms and conditions of this Agreement and the terms and conditions of any form
of letter of credit application or other agreement submitted by the Borrower to,
or entered into by the Borrower with, the Issuing Bank relating to any Letter of
Credit, the terms and conditions of this Agreement shall control.

                  (b) Notice of Issuance, Amendment, Renewal, Extension; Certain
Conditions. To request the issuance of a Letter of Credit (or the amendment,
renewal or extension of an outstanding Letter of Credit), the Borrower shall
hand deliver or telecopy (or transmit by electronic communication, if
arrangements for doing so have been approved by the Issuing Bank) to the Issuing
Bank and the Administrative Agent (reasonably in advance of the requested date
of issuance, amendment, renewal or extension) a notice requesting the issuance
of a Letter of Credit, or identifying the Letter of Credit to be amended,
renewed or extended, and specifying the date of issuance, amendment, renewal or
extension (which shall be a Business Day), the date on which such Letter of
Credit is to expire (which shall comply with paragraph (c) of this Section), the
amount of such Letter of Credit, the name and address of the beneficiary thereof
and such other information as shall be necessary to prepare, amend, renew or
extend such Letter of Credit. If requested by the Issuing Bank, the Borrower
also shall submit a letter of credit application on the Issuing Bank's standard
form in connection with any request for a Letter of Credit. A Letter of Credit
shall be issued, amended, renewed or extended only if (and upon issuance,
amendment, renewal or extension of each Letter of Credit the Borrower shall be
deemed to represent and warrant that), after giving effect to such issuance,
amendment, renewal or extension (i) the LC Exposure shall not exceed
$100,000,000 and (ii) the sum of the total Revolving Credit Exposures plus the
aggregate principal amount of outstanding Competitive Loans shall not exceed the
total Commitments.

                  (c) Expiration Date. Each Letter of Credit shall expire at or
prior to the close of business on the date that is five Business Days prior to
the Revolving Loan Maturity Date.


 

<PAGE>   23



                                                                              19

                  (d) Participations. By the issuance of a Letter of Credit (or
an amendment to a Letter of Credit increasing the amount thereof) and without
any further action on the part of the Issuing Bank or the Lenders, the Issuing
Bank hereby grants to each Lender, and each Lender hereby acquires from the
Issuing Bank, a participation in such Letter of Credit equal to such Lender's
Applicable Percentage of the aggregate amount available to be drawn under such
Letter of Credit. In consideration and in furtherance of the foregoing, each
Lender hereby absolutely and unconditionally agrees to pay to the Administrative
Agent, for the account of the Issuing Bank, such Lender's Applicable Percentage
of each LC Disbursement made by the Issuing Bank and not reimbursed by the
Borrower on the date due as provided in paragraph (e) of this Section, or of any
reimbursement payment required to be refunded to the Borrower for any reason.
Each Lender acknowledges and agrees that its obligation to acquire
participations pursuant to this paragraph in respect of Letters of Credit is
absolute and unconditional and shall not be affected by any circumstance
whatsoever, including any amendment, renewal or extension of any Letter of
Credit or the occurrence and continuance of a Default or reduction or
termination of the Commitments, and that each such payment shall be made without
any offset, abatement, withholding or reduction whatsoever.

                  (e) Reimbursement. If the Issuing Bank shall make any LC
Disbursement in respect of a Letter of Credit, the Borrower shall reimburse such
LC Disbursement by paying to the Administrative Agent an amount equal to such LC
Disbursement not later than 12:00 noon, Houston, Texas time, on the date that
such LC Disbursement is made, if the Borrower shall have received notice of such
LC Disbursement prior to 10:00 a.m., Houston, Texas time, on such date, or, if
such notice has not been received by the Borrower prior to such time on such
date, then not later than 12:00 noon, Houston, Texas time, on (i) the Business
Day that the Borrower receives such notice, if such notice is received prior to
10:00 a.m., Houston, Texas time, on the day of receipt, or (ii) the Business Day
immediately following the day that the Borrower receives such notice, if such
notice is not received prior to such time on the day of receipt; provided that
the Borrower may, subject to the conditions to borrowing set forth herein,
request in accordance with Section 2.03 that such payment be financed with an
ABR Revolving Borrowing in an equivalent amount and, to the extent so financed,
the Borrower's obligation to make such payment shall be discharged and replaced
by the resulting ABR Revolving Borrowing. If the Borrower fails to make such
payment when due, the Administrative Agent shall notify each Lender of the
applicable LC Disbursement, the payment then due from the Borrower in respect
thereof and such Lender's Applicable Percentage thereof. Promptly following
receipt of such notice, each Lender shall pay to the Administrative Agent its
Applicable Percentage of the payment then due from the Borrower, in the same
manner as provided in Section 2.06 with respect to Loans made by such Lender
(and Section 2.06 shall apply, mutatis mutandis, to the payment obligations of
the Lenders), and the Administrative Agent shall promptly pay to the Issuing
Bank the amounts so received by it from the Lenders. Promptly following receipt
by the Administrative Agent of any payment from the Borrower pursuant to this
paragraph, the Administrative Agent shall distribute such payment to the Issuing
Bank or, to the extent that Lenders have made payments pursuant to this
paragraph to reimburse the Issuing Bank, then to such Lenders and the Issuing
Bank as their interests may appear. Any payment made by a Lender pursuant to
this paragraph to reimburse the Issuing Bank for any LC Disbursement (other than
the funding of ABR Revolving Loans as contemplated above) shall not constitute a
Loan and shall not relieve the Borrower of its obligation to reimburse such LC
Disbursement.

                  (f) Obligations Absolute. The Borrower's obligation to
reimburse LC Disbursements as provided in paragraph (e) of this Section shall be
absolute, unconditional and irrevocable, and shall

 

<PAGE>   24



                                                                              20

be performed strictly in accordance with the terms of this Agreement under any
and all circumstances whatsoever and irrespective of (i) any lack of validity or
enforceability of any Letter of Credit or this Agreement, or any term or
provision therein, (ii) any draft or other document presented under a Letter of
Credit proving to be forged, fraudulent or invalid in any respect or any
statement therein being untrue or inaccurate in any respect, (iii) payment by
the Issuing Bank under a Letter of Credit against presentation of a draft or
other document that does not comply with the terms of such Letter of Credit, or
(iv) any other event or circumstance whatsoever, whether or not similar to any
of the foregoing, that might, but for the provisions of this Section, constitute
a legal or equitable discharge of, or provide a right of setoff against, the
Borrower's obligations hereunder. Neither the Administrative Agent, the Lenders
nor the Issuing Bank, nor any of their Related Parties, shall have any liability
or responsibility by reason of or in connection with the issuance or transfer of
any Letter of Credit or any payment or failure to make any payment thereunder
(irrespective of any of the circumstances referred to in the preceding
sentence), or any error, omission, interruption, loss or delay in transmission
or delivery of any draft, notice or other communication under or relating to any
Letter of Credit (including any document required to make a drawing thereunder),
any error in interpretation of technical terms or any consequence arising from
causes beyond the control of the Issuing Bank; provided that the foregoing shall
not be construed to excuse the Issuing Bank from liability to the Borrower to
the extent of any direct damages (as opposed to consequential damages, claims in
respect of which are hereby waived by the Borrower to the extent permitted by
applicable law) suffered by the Borrower that are caused by the Issuing Bank's
failure to exercise care when determining whether drafts and other documents
presented under a Letter of Credit comply with the terms thereof. The parties
hereto expressly agree that, in the absence of gross negligence or wilful
misconduct on the part of the Issuing Bank (as finally determined by a court of
competent jurisdiction), the Issuing Bank shall be deemed to have exercised care
in each such determination. In furtherance of the foregoing and without limiting
the generality thereof, the parties agree that, with respect to documents
presented which appear on their face to be in substantial compliance with the
terms of a Letter of Credit, the Issuing Bank may, in its sole discretion,
either accept and make payment upon such documents without responsibility for
further investigation, regardless of any notice or information to the contrary,
or refuse to accept and make payment upon such documents if such documents are
not in strict compliance with the terms of such Letter of Credit.

                  (g) Disbursement Procedures. The Issuing Bank shall, promptly
following its receipt thereof, examine all documents purporting to represent a
demand for payment under a Letter of Credit. The Issuing Bank shall promptly
notify the Administrative Agent and the Borrower by telephone (confirmed by
telecopy) of such demand for payment and whether the Issuing Bank has made or
will make an LC Disbursement thereunder; provided that any failure to give or
delay in giving such notice shall not relieve the Borrower of its obligation to
reimburse the Issuing Bank and the Lenders with respect to any such LC
Disbursement.

                  (h) Interim Interest. If the Issuing Bank shall make any LC
Disbursement, then, unless the Borrower shall reimburse such LC Disbursement in
full on the date such LC Disbursement is made, the unpaid amount thereof shall
bear interest, for each day from and including the date such LC Disbursement is
made to but excluding the date that the Borrower reimburses such LC
Disbursement, at the rate per annum then applicable to ABR Committed Loans;
provided that, if the Borrower fails to reimburse such LC Disbursement when due
pursuant to paragraph (e) of this Section, then Section 2.12(d) shall apply.
Interest accrued pursuant to this paragraph shall be for the account of the
Issuing Bank, except that interest accrued on and after the date of payment by
any Lender pursuant

 

<PAGE>   25



                                                                              21

to paragraph (e) of this Section to reimburse the Issuing Bank shall be for the
account of such Lender to the extent of such payment.

                  (i) Replacement of the Issuing Bank. The Issuing Bank may be
replaced at any time by written agreement among the Borrower, the Administrative
Agent, the replaced Issuing Bank and the successor Issuing Bank. The
Administrative Agent shall notify the Lenders of any such replacement of the
Issuing Bank. At the time any such replacement shall become effective, the
Borrower shall pay all unpaid fees accrued for the account of the replaced
Issuing Bank pursuant to Section 2.11(b). From and after the effective date of
any such replacement, (i) the successor Issuing Bank shall have all the rights
and obligations of the Issuing Bank under this Agreement with respect to Letters
of Credit to be issued thereafter and (ii) references herein to the term
"Issuing Bank" shall be deemed to refer to such successor or to any previous
Issuing Bank, or to such successor and all previous Issuing Banks, as the
context shall require. After the replacement of an Issuing Bank hereunder, the
replaced Issuing Bank shall remain a party hereto and shall continue to have all
the rights and obligations of an Issuing Bank under this Agreement with respect
to Letters of Credit issued by it prior to such replacement, but shall not be
required to issue additional Letters of Credit.

                  (j) Cash Collateralization. If any Event of Default shall
occur and be continuing, on the Business Day that the Borrower receives notice
from the Administrative Agent or the Required Lenders (or, if the maturity of
the Loans has been accelerated, Lenders with LC Exposure representing at least
51% of the total LC Exposure) demanding the deposit of cash collateral pursuant
to this paragraph, the Borrower shall deposit in an account with the
Administrative Agent, in the name of the Administrative Agent and for the
benefit of the Lenders, an amount in cash equal to the LC Exposure as of such
date plus any accrued and unpaid interest thereon; provided that the obligation
to deposit such cash collateral shall become effective immediately, and such
deposit shall become immediately due and payable, without demand or other notice
of any kind, upon the occurrence of any Event of Default with respect to the
Borrower described in clause (h) or (i) of Article VII. Such deposit shall be
held by the Administrative Agent as collateral for the payment and performance
of the obligations of the Borrower under this Agreement. The Administrative
Agent shall have exclusive dominion and control, including the exclusive right
of withdrawal, over such account. Other than any interest earned on the
investment of such deposits, which investments shall be Permitted Investments
and shall be made at the Borrower's risk and expense, such deposits shall not
bear interest. Interest or profits, if any, on such investments shall accumulate
in such account. Moneys in such account shall be applied by the Administrative
Agent to reimburse the Issuing Bank for LC Disbursements for which it has not
been reimbursed and, to the extent not so applied, shall be held for the
satisfaction of the reimbursement obligations of the Borrower for the LC
Exposure at such time or, if the maturity of the Loans has been accelerated (but
subject to the consent of Lenders with LC Exposure representing at least 51% of
the total LC Exposure), be applied to satisfy other obligations of the Borrower
under this Agreement. If the Borrower is required to provide an amount of cash
collateral hereunder as a result of the occurrence of an Event of Default, such
amount (to the extent not applied as aforesaid) shall be returned to the
Borrower within three Business Days after all Events of Default have been cured
or waived.

                  SECTION 2.06. Funding of Borrowings. (a) Each Lender shall
make each Loan to be made by it hereunder on the proposed date thereof by wire
transfer of immediately available funds by 12:00 noon, Houston, Texas time, to
the account of the Administrative Agent most recently designated by it for such
purpose by notice to the Lenders. The Administrative Agent will make such Loans

 

<PAGE>   26



                                                                              22

available to the Borrower by promptly crediting the amounts so received, in like
funds, to an account of the Borrower maintained with the Administrative Agent in
Houston, Texas and designated by the Borrower in the applicable Borrowing
Request or Competitive Bid Request; provided that ABR Revolving Loans made to
finance the reimbursement of an LC Disbursement as provided in Section 2.05(e)
shall be remitted by the Administrative Agent to the Issuing Bank.

                  (b) Unless the Administrative Agent shall have received notice
from a Lender prior to the proposed date of any Borrowing that such Lender will
not make available to the Administrative Agent such Lender's share of such
Borrowing, the Administrative Agent may assume that such Lender has made such
share available on such date in accordance with paragraph (a) of this Section
and may, in reliance upon such assumption, make available to the Borrower a
corresponding amount. In such event, if a Lender has not in fact made its share
of the applicable Borrowing available to the Administrative Agent, then the
applicable Lender and the Borrower severally agree to pay to the Administrative
Agent forthwith on demand such corresponding amount with interest thereon, for
each day from and including the date such amount is made available to the
Borrower to but excluding the date of payment to the Administrative Agent, at
(i) in the case of such Lender, the greater of the Federal Funds Effective Rate
and a rate determined by the Administrative Agent in accordance with banking
industry rules on interbank compensation or (ii) in the case of the Borrower,
the interest rate applicable to ABR Loans. If such Lender pays such amount to
the Administrative Agent, then such amount shall constitute such Lender's Loan
included in such Borrowing.

                  SECTION 2.07. Interest Elections. (a) Each Revolving Borrowing
initially shall be of the Type specified in the applicable Borrowing Request
and, in the case of a Eurodollar Committed Borrowing, shall have an initial
Interest Period as specified in such Borrowing Request. Thereafter, the Borrower
may elect to convert such Borrowing to a different Type or to continue such
Borrowing and, in the case of a Eurodollar Committed Borrowing, may elect
Interest Periods therefor, all as provided in this Section. The Borrower may
elect different options with respect to different portions of the affected
Borrowing, in which case each such portion shall be allocated ratably among the
Lenders holding the Loans comprising such Borrowing, and the Loans comprising
each such portion shall be considered a separate Borrowing. This Section shall
not apply to Competitive Borrowings which may not be converted or continued.

                  (b) To make an election pursuant to this Section, the Borrower
shall notify the Administrative Agent of such election by telephone by the time
that a Borrowing Request would be required under Section 2.03 if the Borrower
were requesting a Revolving Borrowing of the Type resulting from such election
to be made on the effective date of such election. Each such telephonic Interest
Election Request shall be irrevocable and shall be confirmed promptly by hand
delivery or telecopy to the Administrative Agent of a written Interest Election
Request in a form approved by the Administrative Agent and signed by the
Borrower.

                  (c) Each telephonic and written Interest Election Request
shall specify the following information in compliance with Section 2.02:

                  (i) the Borrowing to which such Interest Election Request
applies and, if different options are being elected with respect to different
portions thereof, the portions thereof to be allocated

 

<PAGE>   27



                                                                              23

to each resulting Borrowing (in which case the information to be specified
pursuant to clauses (iii) and (iv) below shall be specified for each resulting
Borrowing);

                  (ii) the effective date of the election made pursuant to such
Interest Election Request, which shall be a Business Day;

                  (iii) whether the resulting Borrowing is to be an ABR
Borrowing or a Eurodollar Borrowing; and

                  (iv) if the resulting Borrowing is a Eurodollar Borrowing, the
Interest Period to be applicable thereto after giving effect to such election,
which shall be a period contemplated by the definition of the term "Interest
Period".

If any such Interest Election Request requests a Eurodollar Borrowing but does
not specify an Interest Period, then the Borrower shall be deemed to have
selected an Interest Period of one month's duration.

                  (d) Promptly following receipt of an Interest Election
Request, the Administrative Agent shall advise each Lender of the details
thereof and of such Lender's portion of each resulting Borrowing.

                  (e) If the Borrower fails to deliver a timely Interest
Election Request with respect to a Eurodollar Committed Borrowing prior to the
end of the Interest Period applicable thereto, then, unless such Borrowing is
repaid as provided herein, at the end of such Interest Period such Borrowing
shall be converted to an ABR Borrowing. Notwithstanding any contrary provision
hereof, if an Event of Default has occurred and is continuing and the
Administrative Agent, at the request of the Required Lenders, so notifies the
Borrower, then, so long as an Event of Default is continuing (i) no outstanding
Committed Borrowing may be converted to or continued as a Eurodollar Borrowing
and (ii) unless repaid, each Eurodollar Committed Borrowing shall be converted
to an ABR Borrowing at the end of the Interest Period applicable thereto.

                  SECTION 2.08. Termination and Reduction of Commitments. (a)
Unless previously terminated, the Commitments shall terminate on the Revolving
Loan Maturity Date as provided in Section 2.02(e).

                  (b) The Borrower may at any time terminate, or from time to
time reduce, the Commitments; provided that (i) each reduction of the
Commitments shall be in an amount that is an integral multiple of $10,000,000
and (ii) the Borrower shall not terminate or reduce the Commitments if, after
giving effect to any concurrent prepayment of the Loans in accordance with
Section 2.10, the sum of the Revolving Credit Exposures plus the aggregate
principal amount of outstanding Competitive Loans would exceed the total
Commitments.

                  (c) The Borrower shall notify the Administrative Agent of any
election to terminate or reduce the Commitments under paragraph (b) of this
Section at least three Business Days prior to the effective date of such
termination or reduction, specifying such election and the effective date
thereof. Promptly following receipt of any notice, the Administrative Agent
shall advise the Lenders of the contents thereof. Each notice delivered by the
Borrower pursuant to this Section shall be irrevocable; provided that a notice
of termination of the Commitments delivered by the Borrower may state that such

 

<PAGE>   28



                                                                              24

notice is conditioned upon the effectiveness of other credit facilities, in
which case such notice may be revoked by the Borrower (by notice to the
Administrative Agent on or prior to the specified effective date) if such
condition is not satisfied. Any termination or reduction of the Commitments
shall be permanent. Each reduction of the Commitments shall be made ratably
among the Lenders in accordance with their respective Commitments.

                  (d) (i) The Commitments shall automatically be reduced, if at
any time, or from time to time, the Borrower issues debt through a Debt
Securities Offering; provided that (A) each reduction of the Commitments shall
be in an amount that is equal to the net proceeds that are received by the
Borrower from the sale of such debt, (B) the aggregate of all reductions
required under this Section 2.08(d)(i) shall not exceed $300,000,000, (C) each
reduction of the Commitments required hereunder shall be made ratably among the
Lenders in accordance with their respective Commitments and shall be permanent,
and (D) the Borrower shall provide notice to the Administrative Agent of any
reduction of Commitments required under this Section 2.08(d)(i) in accordance
with Section 2.08(c) above.

                  (ii) Unless the merger of Quaker State Corporation and a
Wholly Owned Subsidiary of the Borrower, occurs on or prior to the Early
Termination Date, the Commitments shall automatically terminate in full at 5:00
p.m. (Houston, Texas time) on the Early Termination Date.

                  (iii) Unless both the Quaker State Credit Facility Termination
and the Prior Credit Facility Termination shall have occurred on or prior to the
Early Termination Date, the Commitments shall automatically terminate in full at
5:00 p.m. (Houston, Texas time) on the Early Termination Date.

                  (e) The Borrower may, at its sole expense and effort, upon
notice to any Lender and the Administrative Agent, require such Lender to assign
and delegate, without recourse (in accordance with and subject to the
restrictions contained in Section 9.04), all its interests, rights and
obligations under this Agreement (other than any outstanding Competitive Loans
held by it) to an assignee that shall assume such obligations (which assignee
may be another Lender, if a Lender accepts such assignment); provided that (i)
for all assignees that are not at the time of such assignment a Lender, the
Borrower shall have received the prior written consent of the Administrative
Agent (and, if a Commitment is being assigned, the Issuing Bank), which consent
shall not unreasonably be withheld and (ii) such assigning Lender shall have
received payment of an amount equal to the outstanding principal of its Loans
(other than Competitive Loans) and participations in LC Disbursements, accrued
interest thereon, accrued fees and all other amounts payable to it hereunder,
from the assignee (to the extent of such outstanding principal and accrued
interest and fees) or the Borrower (in the case of all other amounts).

                  SECTION 2.09. Repayment of Loans; Evidence of Debt. (a) The
Borrower hereby unconditionally promises to pay (i) to the Administrative Agent
for the account of each Lender the then unpaid principal amount of each
Revolving Loan on the Revolving Loan Maturity Date, unless the same are
converted to Term Loans, (ii) to the Administrative Agent for the account of
each Lender the then unpaid principal amount of each Competitive Loan on the
last day of the Interest Period applicable to such Loan, and (iii) to the
Administrative Agent for the account of each Lender the then unpaid principal
amount of each Term Loan on the Final Maturity Date.


 

<PAGE>   29



                                                                              25

                  (b) Each Lender shall maintain in accordance with its usual
practice an account or accounts evidencing the indebtedness of the Borrower to
such Lender resulting from each Loan made by such Lender, including the amounts
of principal and interest payable and paid to such Lender from time to time
hereunder.

                  (c) The Administrative Agent shall maintain accounts in which
it shall record (i) the amount of each Loan made hereunder, the Class and Type
thereof and the Interest Period applicable thereto, (ii) the amount of any
principal or interest due and payable or to become due and payable from the
Borrower to each Lender hereunder and (iii) the amount of any sum received by
the Administrative Agent hereunder for the account of the Lenders and each
Lender's share thereof.

                  (d) The entries made in the accounts maintained pursuant to
paragraph (b) or (c) of this Section shall be prima facie evidence of the
existence and amounts of the obligations recorded therein; provided that the
failure of any Lender or the Administrative Agent to maintain such accounts or
any error therein shall not in any manner affect the obligation of the Borrower
to repay the Loans in accordance with the terms of this Agreement.

                  (e) Any Lender may request that Loans made by it be evidenced
by a promissory note. In such event, the Borrower shall prepare, execute and
deliver to such Lender a promissory note payable to the order of such Lender
(or, if requested by such Lender, to such Lender and its registered assigns) and
in a form approved by the Administrative Agent. Thereafter, the Loans evidenced
by such promissory note and interest thereon shall at all times (including after
assignment pursuant to Section 9.04) be represented by one or more promissory
notes in such form payable to the order of the payee named therein (or, if such
promissory note is a registered note, to such payee and its registered assigns).

                  SECTION 2.10. Prepayment of Loans. (a) The Borrower shall have
the right at any time and from time to time to prepay any Borrowing in whole or
in part, subject to prior notice in accordance with paragraph (b) of this
Section; provided that the Borrower shall not have the right to prepay any
Competitive Loan without the prior consent of the Lender thereof.

                  (b) The Borrower shall notify the Administrative Agent by
telephone (confirmed by telecopy) of any prepayment hereunder (i) in the case of
prepayment of a Eurodollar Committed Borrowing, not later than 11:00 a.m.,
Houston, Texas time, three Business Days before the date of prepayment, or (ii)
in the case of prepayment of an ABR Committed Borrowing, not later than 11:00
a.m., Houston, Texas time, one Business Day before the date of prepayment. Each
such notice shall be irrevocable and shall specify the prepayment date and the
principal amount of each Borrowing or portion thereof to be prepaid; provided
that, if a notice of prepayment is given in connection with a conditional notice
of termination of the Commitments as contemplated by Section 2.08, then such
notice of prepayment may be revoked if such notice of termination is revoked in
accordance with Section 2.08. Promptly following receipt of any such notice
relating to a Committed Borrowing, the Administrative Agent shall advise the
Lenders of the contents thereof. Each partial prepayment of any Committed
Borrowing shall be in an amount that would be permitted in the case of an
advance of a Committed Borrowing of the same Type as provided in Section 2.02.
Each prepayment of a Committed Borrowing shall be applied ratably to the Loans
included in the prepaid Borrowing. Prepayments shall be accompanied by accrued
interest to the extent required by Section 2.12.

 

<PAGE>   30



                                                                              26

                  (c) If at any time the sum of the Revolving Credit Exposures
plus the aggregate principal amount of outstanding Competitive Loans is in
excess of the total Commitments, the Borrower shall immediately pay to the
Administrative Agent, for the account of the Banks, the amount of such excess to
be applied as a prepayment of the Revolving Loans and LC Disbursements
outstanding. Any such prepayment shall be payable in full on the date on which
the applicable reduction or termination of the Commitments pursuant to Section
2.08(d) becomes effective.

                  (d) If at any time after the Revolving Loan Maturity Date, the
Borrower or its Subsidiaries receives net proceeds from any issuance or sale of
debt through a Debt Securities Offering, then to the extent the outstanding
principal balance of the Term Loans at such time exceeds $700,000,000, 100% of
such net proceeds shall be applied on the date received to the Term Loans to the
extent necessary to reduce the outstanding principal balance thereof to
$700,000,000.

                  SECTION 2.11. Fees. (a) The Borrower agrees to pay to the
Administrative Agent for the account of each Lender a facility fee, which shall
accrue at the Applicable Rate on the daily amount of the Commitment of such
Lender (whether used or unused) during the period from and including the date of
this Agreement to but excluding the date on which such Commitment terminates;
provided that, if such Lender continues to have any Committed Credit Exposure
after its Commitment terminates, then such facility fee shall continue to accrue
on the daily amount of such Lender's Committed Credit Exposure from and
including the date on which its Commitment terminates to but excluding the date
on which such Lender ceases to have any Committed Credit Exposure. Accrued
facility fees shall be payable in arrears on the last day of March, June,
September and December of each year and on the date on which the Commitments
terminate, commencing on the first such date to occur after the date hereof;
provided that any facility fees accruing after the date on which the Committed
Loans have matured, whether by acceleration or otherwise, shall be payable on
demand. All facility fees shall be computed on the basis of a year of 360 days
and shall be payable for the actual number of days elapsed (including the first
day but excluding the last day).

                  (b) The Borrower agrees to pay (i) to the Administrative Agent
for the account of each Lender a participation fee with respect to its
participations in Letters of Credit, which shall accrue at the same Applicable
Rate as interest on Eurodollar Committed Loans on the average daily amount of
such Lender's LC Exposure (excluding any portion thereof attributable to
unreimbursed LC Disbursements) during the period from and including the
Effective Date to but excluding the later of the date on which such Lender's
Commitment terminates and the date on which such Lender ceases to have any LC
Exposure, and (ii) to the Issuing Bank a fronting fee, which shall accrue at the
rate of 0.125% per annum on the average daily amount of the LC Exposure
(excluding any portion thereof attributable to unreimbursed LC Disbursements)
during the period from and including the Effective Date to but excluding the
later of the date of termination of the Commitments and the date on which there
ceases to be any LC Exposure, as well as the Issuing Bank's standard fees with
respect to the issuance, amendment, renewal or extension of any Letter of Credit
or processing of drawings thereunder. Participation fees and fronting fees
accrued through and including the last day of March, June, September and
December of each year shall be payable on such day, commencing on the first such
date to occur after the Effective Date; provided that all such fees shall be
payable on the date on which the Commitments terminate and any such fees
accruing after the date on which the Commitments terminate shall be payable on
demand. Any other fees payable to the Issuing Bank pursuant to this paragraph
shall be payable within 10 days after demand. All participation fees and
fronting fees shall be computed on

 

<PAGE>   31



                                                                              27

the basis of a year of 360 days and shall be payable for the actual number of
days elapsed (including the first day but excluding the last day).

                  (c) The Borrower agrees to pay to the Administrative Agent,
for its own account, fees payable in the amounts and at the times separately
agreed upon between the Borrower and the Administrative Agent.

                  (d) All fees payable hereunder shall be paid on the dates due,
in immediately available funds, to the Administrative Agent (or to the Issuing
Bank, in the case of fees payable to it) for distribution, in the case of
facility fees and participation fees, to the Lenders. Fees paid shall not be
refundable under any circumstances.

                  SECTION 2.12. Interest. (a) The Loans comprising each ABR
Borrowing shall bear interest at the Alternate Base Rate.

                  (b) The Loans comprising each Eurodollar Borrowing shall bear
interest (i) in the case of a Eurodollar Committed Loan, at the Adjusted LIBO
Rate for the Interest Period in effect for such Borrowing plus the Applicable
Rate, or (ii) in the case of a Eurodollar Competitive Loan, at the LIBO Rate for
the Interest Period in effect for such Borrowing plus (or minus, as applicable)
the Margin applicable to such Loan.

                  (c) Each Fixed Rate Loan shall bear interest at the Fixed Rate
applicable to such Loan.

                  (d) Notwithstanding the foregoing, if any principal of or
interest on any Loan or any fee or other amount payable by the Borrower
hereunder is not paid when due, whether at stated maturity, upon acceleration or
otherwise, such overdue amount shall bear interest, after as well as before
judgment, at a rate per annum equal to (i) in the case of overdue principal of
any Loan, 2% plus the rate otherwise applicable to such Loan as provided in the
preceding paragraphs of this Section or (ii) in the case of any other amount, 2%
plus the rate applicable to ABR Loans as provided in paragraph (a) of this
Section.

                  (e) Accrued interest on each Loan shall be payable in arrears
on each Interest Payment Date for such Loan and, in the case of Revolving Loans,
upon termination of the Commitments; provided that (i) interest accrued pursuant
to paragraph (d) of this Section shall be payable on demand, (ii) in the event
of any repayment or prepayment of any Loan (other than a prepayment of an ABR
Committed Loan prior to the end of the Availability Period), accrued interest on
the principal amount repaid or prepaid shall be payable on the date of such
repayment or prepayment and (iii) in the event of any conversion of any
Eurodollar Committed Loan prior to the end of the current Interest Period
therefor, accrued interest on such Loan shall be payable on the effective date
of such conversion.

                  (f) All interest hereunder shall be computed on the basis of a
year of 360 days, except that interest computed by reference to the Alternate
Base Rate at times when the Alternate Base Rate is based on the Prime Rate shall
be computed on the basis of a year of 365 days (or 366 days in a leap year), and
in each case shall be payable for the actual number of days elapsed (including
the first day but excluding the last day). The applicable Alternate Base Rate,
Adjusted LIBO Rate or LIBO Rate

 

<PAGE>   32



                                                                              28

shall be determined by the Administrative Agent, and such determination shall be
conclusive absent manifest error.

                  SECTION 2.13. Alternate Rate of Interest. If prior to the
commencement of any Interest Period for a Eurodollar Borrowing:

                  (a) the Administrative Agent determines (which determination
         shall be conclusive absent manifest error) that adequate and reasonable
         means do not exist for ascertaining the Adjusted LIBO Rate or the LIBO
         Rate, as applicable, for such Interest Period; or

                  (b) the Administrative Agent is advised by the Required
         Lenders (or, in the case of a Eurodollar Competitive Loan, the Lender
         that is required to make such Loan) that the Adjusted LIBO Rate or the
         LIBO Rate, as applicable, for such Interest Period will not adequately
         and fairly reflect the cost to such Lenders (or Lender) of making or
         maintaining their Loans (or its Loan) included in such Borrowing for
         such Interest Period;

then the Administrative Agent shall give notice thereof to the Borrower and the
Lenders by telephone or telecopy as promptly as practicable thereafter and,
until the Administrative Agent notifies the Borrower and the Lenders that the
circumstances giving rise to such notice no longer exist, (i) any Interest
Election Request that requests the conversion of any Committed Borrowing to, or
continuation of any Committed Borrowing as, a Eurodollar Borrowing shall be
ineffective, (ii) if any Borrowing Request requests a Eurodollar Revolving
Borrowing, such Borrowing shall be made as an ABR Borrowing and (iii) any
request by the Borrower for a Eurodollar Competitive Borrowing shall be
ineffective; provided that (A) if the circumstances giving rise to such notice
do not affect all the Lenders, then requests by the Borrower for Eurodollar
Competitive Borrowings may be made to Lenders that are not affected thereby and
(B) if the circumstances giving rise to such notice affect only one Type of
Borrowings, then the other Type of Borrowings shall be permitted.

                  SECTION 2.14. Increased Costs. (a) If any Change in Law shall:

                  (i) impose, modify or deem applicable any reserve, special
         deposit or similar requirement against assets of, deposits with or for
         the account of, or credit extended by, any Lender (except any such
         reserve requirement reflected in the Adjusted LIBO Rate) or the Issuing
         Bank; or

                  (ii) impose on any Lender or the Issuing Bank or the London
         interbank market any other condition affecting this Agreement or
         Eurodollar Loans or Fixed Rate Loans made by such Lender or any Letter
         of Credit or participation therein;

and the result of any of the foregoing shall be to increase the cost to such
Lender of making or maintaining any Eurodollar Loan or Fixed Rate Loan (or of
maintaining its obligation to make any such Loan) or to increase the cost to
such Lender or the Issuing Bank of participating in, issuing or maintaining any
Letter of Credit or to reduce the amount of any sum received or receivable by
such Lender or the Issuing Bank hereunder (whether of principal, interest or
otherwise), then the Borrower will pay to such Lender or the Issuing Bank, as
the case may be, such additional amount or amounts as

 

<PAGE>   33



                                                                              29

will compensate such Lender or the Issuing Bank, as the case may be, for such
additional costs incurred or reduction suffered.

                  (b) If any Lender or the Issuing Bank determines that any
Change in Law regarding capital requirements has or would have the effect of
reducing the rate of return on such Lender's or the Issuing Bank's capital or on
the capital of such Lender's or the Issuing Bank's holding company, if any, as a
consequence of this Agreement or the Loans made by, or participations in Letters
of Credit held by, such Lender, or the Letters of Credit issued by the Issuing
Bank, to a level below that which such Lender or the Issuing Bank or such
Lender's or the Issuing Bank's holding company could have achieved but for such
Change in Law (taking into consideration such Lender's or the Issuing Bank's
policies and the policies of such Lender's or the Issuing Bank's holding company
with respect to capital adequacy), then from time to time the Borrower will pay
to such Lender or the Issuing Bank, as the case may be, such additional amount
or amounts as will compensate such Lender or the Issuing Bank or such Lender's
or the Issuing Bank's holding company for any such reduction suffered.

                  (c) A certificate of a Lender or the Issuing Bank setting
forth the amount or amounts necessary to compensate such Lender or the Issuing
Bank or its holding company, as the case may be, as specified in paragraph (a)
or (b) of this Section and setting forth in reasonable detail the calculation
thereof shall be delivered to the Borrower and shall be conclusive absent
manifest error. The Borrower shall pay such Lender or the Issuing Bank, as the
case may be, the amount shown as due on any such certificate within 30 days
after receipt thereof.

                  (d) Failure or delay on the part of any Lender or the Issuing
Bank to demand compensation pursuant to this Section shall not constitute a
waiver of such Lender's or the Issuing Bank's right to demand such compensation;
provided that the Borrower shall not be required to compensate a Lender or the
Issuing Bank pursuant to this Section for any increased costs or reductions
incurred more than 90 days prior to the date that such Lender or the Issuing
Bank, as the case may be, notifies the Borrower of the Change in Law giving rise
to such increased costs or reductions and of such Lender's or the Issuing Bank's
intention to claim compensation therefor; provided further that, if the Change
in Law giving rise to such increased costs or reductions is retroactive, then
the 90-day period referred to above shall be extended to include the period of
retroactive effect thereof.

                  (e) Notwithstanding the foregoing provisions of this Section,
a Lender shall not be entitled to compensation pursuant to this Section in
respect of any Competitive Loan if the Change in Law that would otherwise
entitle it to such compensation shall have been publicly announced prior to
submission of the Competitive Bid pursuant to which such Loan was made.

                  SECTION 2.15. Break Funding Payments. In the event of (a) the
payment of any principal of any Eurodollar Loan or Fixed Rate Loan other than on
the last day of an Interest Period applicable thereto (including as a result of
an Event of Default), (b) the conversion of any Eurodollar Loan other than on
the last day of the Interest Period applicable thereto, (c) the Borrower's
failure to borrow, convert, continue or prepay any Revolving Loan on the date
specified in any notice delivered pursuant hereto (regardless of whether such
notice may be revoked under Section 2.10(b) and is revoked in accordance
therewith), (d) the Borrower's failure to borrow any Competitive Loan after
accepting the Competitive Bid to make such Loan, or (e) the assignment of any
Eurodollar Loan or Fixed Rate Loan other than on the last day of the Interest
Period applicable thereto as a result of a request by the

 

<PAGE>   34



                                                                              30

Borrower pursuant to Section 2.08(e), then, in any such event, the Borrower
shall compensate each Lender for the loss, cost and expense attributable to such
event. In the case of a Eurodollar Loan, such loss, cost or expense to any
Lender shall be deemed to include an amount determined by such Lender to be the
excess, if any, of (i) the amount of interest which would have accrued on the
principal amount of such Loan had such event not occurred, at the Adjusted LIBO
Rate that would have been applicable to such Loan, for the period from the date
of such event to the last day of the then current Interest Period therefor (or,
in the case of a failure to borrow, convert or continue, for the period that
would have been the Interest Period for such Loan), over (ii) the amount of
interest which would accrue on such principal amount for such period at the
interest rate which such Lender would bid were it to bid, at the commencement of
such period, for dollar deposits of a comparable amount and period from other
banks in the eurodollar market. A certificate of any Lender setting forth any
amount or amounts that such Lender is entitled to receive pursuant to this
Section and setting forth in reasonable detail the calculation thereof shall be
delivered to the Borrower and shall be conclusive absent manifest error. The
Borrower shall pay such Lender the amount shown as due on any such certificate
within 30 days after receipt thereof.

                  SECTION 2.16. Taxes. (a) Any and all payments by or on account
of any obligation of the Borrower hereunder shall be made free and clear of and
without deduction for any Indemnified Taxes or Other Taxes; provided that if the
Borrower shall be required to deduct any Indemnified Taxes or Other Taxes from
such payments, then (i) the sum payable shall be increased as necessary so that
after making all required deductions (including deductions applicable to
additional sums payable under this Section) the Administrative Agent, Lender or
Issuing Bank (as the case may be) receives an amount equal to the sum it would
have received had no such deductions been made, (ii) the Borrower shall make
such deductions and (iii) the Borrower shall pay the full amount deducted to the
relevant Governmental Authority in accordance with applicable law.

                  (b) In addition, the Borrower shall pay any Other Taxes
(including, without limitation, any Other Tax which Borrower is required to pay
pursuant to Section 2.16(a)(iii)) to the relevant Governmental Authority in
accordance with applicable law.

                  (c) The Borrower shall indemnify the Administrative Agent,
each Lender and the Issuing Bank, within 20 days after written demand therefor,
for the full amount of any Indemnified Taxes or Other Taxes paid by the
Administrative Agent, such Lender or the Issuing Bank, as the case may be, on or
with respect to any payment by or on account of any obligation of the Borrower
hereunder (including Indemnified Taxes or Other Taxes imposed or asserted on or
attributable to amounts payable under this Section) and any penalties, interest
and reasonable and documented expenses arising therefrom or with respect
thereto, whether or not such Indemnified Taxes or Other Taxes were correctly or
legally imposed or asserted by the relevant Governmental Authority. A
certificate as to the amount of such payment or liability delivered to the
Borrower by a Lender or the Issuing Bank, or by the Administrative Agent on its
own behalf or on behalf of a Lender or the Issuing Bank, shall be conclusive
absent manifest error. To the extent that the Administrative Agent, any Lender,
or the Issuing Bank is reimbursed by a Governmental Authority and such
reimbursement is clearly identified as specifically relating to any Indemnified
Tax or Other Tax that was incorrectly or illegally asserted in connection with
this Agreement, such Person shall return to the Borrower the amount of such
reimbursement, together with any interest that may have been paid by the
Governmental Authority with respect thereto, to the extent the Borrower has
actually paid such Person with respect thereto.

 

<PAGE>   35



                                                                              31

                  (d) As soon as practicable after any payment of Indemnified
Taxes or Other Taxes by the Borrower to a Governmental Authority, the Borrower
shall deliver to the Administrative Agent the original or a certified copy of a
receipt issued by such Governmental Authority evidencing such payment, a copy of
the return reporting such payment or other evidence of such payment reasonably
satisfactory to the Administrative Agent.

                  (e) Each of the Administrative Agent, Lenders, and the Issuing
Bank represents that it is either (i) a corporation organized under the laws of
the United States of America or any state thereof or (ii) it is entitled to
complete exemption from United States withholding tax imposed on or with respect
to any payments, including fees, to be made to it pursuant to this Agreement (A)
under an applicable provision of a tax convention to which the United States of
America is a party or (B) because it is acting through a branch, agency or
office in the United States of America and any payment to be received by it
hereunder is effectively connected with a trade or business in the United States
of America. Each of the Administrative Agent, Lenders, and the Issuing Bank that
is not a corporation organized under the laws of the United States of America or
any state thereof either represents that it has previously furnished to the
Borrower (with a copy to the Administrative Agent) or agrees to provide to the
Borrower (with a copy to the Administrative Agent) on the date of this
Agreement, or on the date which it becomes a party to this Agreement, two
accurate and complete original signed copies of either (1) Internal Revenue
Service Form 4224 (or successor form) certifying that all payments to be made to
it hereunder will be effectively connected to a United States trade or business,
(2) Internal Revenue Service Form 1001 (or successor form) certifying that it is
entitled to the benefit of a tax convention to which the United States of
America is a party which completely exempts from United States withholding tax
all payments to be made to it hereunder, or (3) such properly completed and
executed documentation prescribed by applicable law or reasonably requested by
the Borrower as will permit such payments to be made without withholding; and
each of the Administrative Agent, Lenders and Issuing Bank further agrees to
provide to Borrower, at the time or times prescribed by applicable law, such
properly completed and executed documentation prescribed by applicable law or
reasonably requested by the Borrower as will permit such payments to be made
without withholding. If any of the Administrative Agent, Lenders, or Issuing
Bank determines that it is unable to submit any form or certificate that it is
obligated to submit pursuant to this Section 2.16(e), or that is required to
withdraw or cancel any such form or certificate previously submitted, it shall
promptly notify the Borrower (with copy to the Administrative Agent) of such
fact. In the event that such person fails to deliver any forms required under
this Section 2.16(e) upon its initially becoming a party hereunder, the
Borrower's obligation to pay additional amounts shall be reduced to the amount
that it would have been obligated to pay had such forms been provided.

                  (f) Any Lender claiming any additional amounts payable
pursuant to this Section 2.16 shall use its reasonable efforts to change the
jurisdiction of its lending office so as to avoid the imposition of any
Indemnified Taxes or Other Taxes or to otherwise eliminate the amount of any
such additional amounts which may thereafter accrue.

                  SECTION 2.17. Payments Generally; Pro Rata Treatment; Sharing
of Set-offs. (a) The Borrower shall make each payment required to be made by it
hereunder (whether of principal, interest, fees or reimbursement of LC
Disbursements, or of amounts payable under Sections 2.14, 2.15 or 2.16, or
otherwise) prior to 12:00 noon, Houston, Texas time, on the date when due, in
immediately available funds, without set-off or counterclaim. Any amounts
received after such time on any date may, in the

 

<PAGE>   36



                                                                              32

discretion of the Administrative Agent, be deemed to have been received on the
next succeeding Business Day for purposes of calculating interest thereon. All
such payments shall be made to the Administrative Agent at its offices at 600
Travis Street, Houston, Texas, except payments to be made directly to the
Issuing Bank as expressly provided herein and except that payments pursuant to
Sections 2.14, 2.15, 2.16 and 9.03 shall be made directly to the Persons
entitled thereto. The Administrative Agent shall distribute any such payments
received by it for the account of any other Person to the appropriate recipient
promptly following receipt thereof. If any payment hereunder shall be due on a
day that is not a Business Day, the date for payment shall be extended to the
next succeeding Business Day, and, in the case of any payment accruing interest,
interest thereon shall be payable for the period of such extension. All payments
hereunder shall be made in dollars.

                  (b) If at any time insufficient funds are received by and
available to the Administrative Agent to pay fully all amounts of principal,
unreimbursed LC Disbursements, interest and fees then due hereunder, such funds
shall be applied (i) first, towards payment of interest and fees then due
hereunder, ratably among the parties entitled thereto in accordance with the
amounts of interest and fees then due to such parties, and (ii) second, towards
payment of principal and unreimbursed LC Disbursements then due hereunder,
ratably among the parties entitled thereto in accordance with the amounts of
principal and unreimbursed LC Disbursements then due to such parties.

                  (c) If any Lender shall, by exercising any right of set-off or
counterclaim or otherwise, obtain payment in respect of any principal of or
interest on any of its Committed Loans or participations in LC Disbursements
resulting in such Lender receiving payment of a greater proportion of the
aggregate amount of its Committed Loans and participations in LC Disbursements
and accrued interest thereon than the proportion received by any other Lender,
then the Lender receiving such greater proportion shall purchase (for cash at
face value) participations in the Committed Loans and participations in LC
Disbursements of other Lenders to the extent necessary so that the benefit of
all such payments shall be shared by the Lenders ratably in accordance with the
aggregate amount of principal of and accrued interest on their respective
Committed Loans and participations in LC Disbursements; provided that (i) if any
such participations are purchased and all or any portion of the payment giving
rise thereto is recovered, such participations shall be rescinded and the
purchase price restored to the extent of such recovery, without interest, and
(ii) the provisions of this paragraph shall not be construed to apply to any
payment made by the Borrower pursuant to and in accordance with the express
terms of this Agreement or any payment obtained by a Lender as consideration for
the assignment of or sale of a participation in any of its Loans or
participations in LC Disbursements to any assignee or participant, other than to
the Borrower or any Subsidiary or Affiliate thereof (as to which the provisions
of this paragraph shall apply). The Borrower consents to the foregoing and
agrees, to the extent it may effectively do so under applicable law, that any
Lender acquiring a participation pursuant to the foregoing arrangements may
exercise against the Borrower rights of set-off and counterclaim with respect to
such participation as fully as if such Lender were a direct creditor of the
Borrower in the amount of such participation.

                  (d) Unless the Administrative Agent shall have received notice
from the Borrower prior to the date on which any payment is due to the
Administrative Agent for the account of the Lenders or the Issuing Bank
hereunder that the Borrower will not make such payment, the Administrative Agent
may assume that the Borrower has made such payment on such date in accordance
herewith and may, in reliance upon such assumption, distribute to the Lenders or
the Issuing Bank, as the case may be, the amount due. In such event, if the
Borrower has not in fact made such payment, then each of the Lenders

 

<PAGE>   37



                                                                              33

or the Issuing Bank, as the case may be, severally agrees to repay to the
Administrative Agent forthwith on demand the amount so distributed to such
Lender or Issuing Bank with interest thereon, for each day from and including
the date such amount is distributed to it to but excluding the date of payment
to the Administrative Agent, at the greater of the Federal Funds Effective Rate
and a rate determined by the Administrative Agent in accordance with banking
industry rules on interbank compensation.

                  (e) If any Lender shall fail to make any payment required to
be made by it pursuant to Sections 2.05(d) or (e), 2.06(b) or 2.17(d), then the
Administrative Agent may, in its discretion (notwithstanding any contrary
provision hereof), apply any amounts thereafter received by the Administrative
Agent for the account of such Lender to satisfy such Lender's obligations under
such Sections until all such unsatisfied obligations are fully paid.

                  SECTION 2.18. Mitigation Obligations. Each Lender will notify
the Borrower of any event occurring after the date of this Agreement which will
entitle such Lender to compensation pursuant to Sections 2.14, 2.15 and 2.16 as
promptly as practicable after it obtains knowledge thereof and determines to
request such compensation, provided that such Lender shall not be liable for the
failure to provide such notice. If any Lender requests compensation under
Section 2.14, or if the Borrower is required to pay any additional amount to any
Lender or any Governmental Authority for the account of any Lender pursuant to
Section 2.16, then such Lender shall use reasonable efforts to avoid or minimize
the amounts payable, including, without limitation, the designation of a
different lending office for funding or booking its Loans hereunder or to assign
its rights and obligations hereunder to another of its offices, branches or
affiliates, if, in the judgment of such Lender, such designation or assignment
(i) would eliminate or reduce amounts payable pursuant to Section 2.14 or 2.16,
as the case may be, in the future and (ii) would not subject such Lender to any
unreimbursed cost or expense and would not otherwise be disadvantageous to such
Lender. The Borrower hereby agrees to pay all reasonable and documented costs
and expenses incurred by any Lender in connection with any such designation or
assignment.

                  SECTION 2.19. Limitation of Compensation if Applicable Lending
Office is Changed. Notwithstanding anything herein to the contrary, in the event
that any Lender designates a different lending office other than as set forth on
the signature pages hereof, the Borrower shall not be liable to pay or
compensate such Lender under any provision of Sections 2.14 or 2.16 in an amount
in excess of that for which the Borrower would have been liable had such
designation not been made unless such designation was made (1), so long as no
Default has occurred and is continuing, with the Borrower's prior written
consent or (2) by reason of such Lender's having been required by Section 2.18
to designate a new lending office.


                                   ARTICLE III

                         Representations and Warranties

                  The Borrower represents and warrants to the Lenders that:

                  SECTION 3.01. Organization; Powers. Each of the Borrower and
its Material Subsidiaries is duly organized, validly existing and in good
standing under the laws of the jurisdiction

 

<PAGE>   38



                                                                              34

of its organization, has all requisite corporate power and authority to carry on
its business as now conducted and, except where the failure to do so,
individually or in the aggregate, could not reasonably be expected to result in
a Material Adverse Effect, is qualified to do business in, and is in good
standing in, every jurisdiction where such qualification is required.

                  SECTION 3.02. Authorization; Enforceability. The Transactions
are within the Borrower's corporate powers and have been duly authorized by all
necessary corporate and, if required, stockholder action. This Agreement has
been duly executed and delivered by the Borrower and constitutes a legal, valid
and binding obligation of the Borrower, enforceable in accordance with its
terms, subject to applicable bankruptcy, insolvency, reorganization, moratorium
or other laws affecting creditors' rights generally and subject to general
principles of equity, regardless of whether considered in a proceeding in equity
or at law.

                  SECTION 3.03. Governmental Approvals; No Conflicts. The
Transactions (a) do not require the Borrower or any Material Subsidiary to
obtain any consent or approval of, registration or filing with, or any other
action by, any Governmental Authority, except such as have been obtained or made
and are in full force and effect and except as identified in Sections 2.08(d)
(ii) and (iii), (b) will not violate any applicable law or regulation or the
charter, by-laws or other organizational documents of the Borrower or any of its
Material Subsidiaries or any order of any Governmental Authority, (c) will not
violate or result in a default under any indenture, material agreement or other
instrument binding upon the Borrower or any of its Material Subsidiaries or its
assets, or give rise to a right thereunder to require any payment to be made by
the Borrower or any of its Material Subsidiaries, and (d) will not result in the
creation or imposition of any Lien on any asset of the Borrower or any of its
Subsidiaries.

                  SECTION 3.04. No Material Adverse Change. At the Effective
Date, there has been no material adverse change in the financial condition,
operations or business of the Borrower and its Material Subsidiaries, taken as a
whole, since June 30, 1998, including with regard thereto the selected pro forma
financial information dated as of and for the six months ended June 30, 1998,
set forth in the Quaker State Corporation/Pennzoil Products Company Proxy
Statement/Prospectus dated August 17, 1998.

                  SECTION 3.05. Litigation and Environmental Matters. (a) At the
Effective Date, there are no actions, suits or proceedings by or before any
arbitrator or Governmental Authority pending against or, to the knowledge of the
Borrower, threatened against or affecting the Borrower or any of its
Subsidiaries that could reasonably be expected, individually or in the
aggregate, to result in a Material Adverse Effect.

                  (b) Except for any matters that, individually or in the
aggregate, could not reasonably be expected to result in a Material Adverse
Effect, neither the Borrower nor any of its Subsidiaries (i) has failed to
comply with any Environmental Law or to obtain, maintain or comply with any
permit, license or other approval required under any Environmental Law, (ii) has
become subject to any Environmental Liability, (iii) has received notice of any
claim with respect to any Environmental Liability or (iv) knows of any basis for
any Environmental Liability.

                  SECTION 3.06. Compliance with Laws and Agreements. Each of the
Borrower and its Subsidiaries is in compliance with all laws, regulations and
orders of any Governmental Authority

 

<PAGE>   39



                                                                              35

applicable to it or its property and all indentures, agreements and other
instruments binding upon it or its property, except where the failure to do so,
individually or in the aggregate, could not reasonably be expected to result in
a Material Adverse Effect. No Default has occurred and is continuing.

                  SECTION 3.07. Investment and Holding Company Status. Neither
the Borrower nor any of its Subsidiaries is (a) an "investment company" as
defined in, or subject to regulation under, the Investment Company Act of 1940
or (b) a "holding company" as defined in, or subject to regulation under, the
Public Utility Holding Company Act of 1935.

                  SECTION 3.08. Taxes. Each of the Borrower and its Subsidiaries
has timely filed or caused to be filed all Tax returns and reports required to
have been filed and has paid or caused to be paid all Taxes required to have
been paid by it, except (a) Taxes that are being contested in good faith by
appropriate proceedings and for which the Borrower or such Subsidiary, as
applicable, has set aside on its books adequate reserves or (b) to the extent
that the failure to do so could not reasonably be expected to result in a
Material Adverse Effect.

                  SECTION 3.09. ERISA. No ERISA Event has occurred or is
reasonably expected to occur that, when taken together with all other such ERISA
Events for which liability is reasonably expected to occur, could reasonably be
expected to result in a Material Adverse Effect. The present value of all
accumulated benefit obligations under each Plan (based on the assumptions used
for purposes of Statement of Financial Accounting Standards No. 87) did not, as
of the date of the most recent financial statements reflecting such amounts,
exceed by more than $50,000,000 the fair market value of the assets of such
Plan, and the present value of all accumulated benefit obligations of all
underfunded Plans (based on the assumptions used for purposes of Statement of
Financial Accounting Standards No. 87) did not, as of the date of the most
recent financial statements reflecting such amounts, exceed by more than
$50,000,000 the fair market value of the assets of all such underfunded Plans.

                  SECTION 3.10. Financial Information. The Borrower has
disclosed to the Lenders all agreements, instruments and corporate or other
restrictions to which it or any of its Material Subsidiaries is subject, and all
other matters known to it (other than industry-wide risks normally associated
with the types of business conducted by the Borrower and its Subsidiaries) that,
individually or in the aggregate, could reasonably be expected to result in a
Material Adverse Effect. Neither the Information Memorandum nor any of the other
reports, financial statements, certificates or other written information
furnished by or on behalf of the Borrower to the Administrative Agent or any
Lender in connection with the negotiation of this Agreement or delivered
hereunder (as modified or supplemented by other information so furnished) when
considered as a whole contains any material misstatement of fact or omits to
state any material fact (other than industry wide risks normally associated with
the types of business conducted by the Borrower and its Subsidiaries) necessary
to make the statements therein, in the light of the circumstances under which
they were made, not misleading as of the date made or deemed made; provided
that, with respect to projected financial information, the Borrower represents
only that such information was prepared in good faith based upon assumptions
believed to be reasonable at the time, it being recognized by the Lenders that
such projections as they relate to future events are not to be viewed as fact
and that actual results during the period or periods covered by such projections
may differ from the projected results set forth therein by a material amount.


 

<PAGE>   40



                                                                              36

                  SECTION 3.11. Year 2000. Any reprogramming required to permit
the proper functioning, in and following the year 2000, of (a) the Borrower's,
or any Material Subsidiary's, computer systems and (b) equipment containing
embedded microchips (including systems and equipment supplied by others or with
which Borrower's, or any Material Subsidiary's, systems interface) and the
testing of all such systems and equipment, as so reprogrammed, will be completed
by October 1, 1999. The cost to the Borrower and its Material Subsidiaries of
such reprogramming and testing and of the reasonably foreseeable consequences of
year 2000 to the Borrower (including, without limitation, reprogramming errors
and the failure of others' systems or equipment) will not result in a Default or
a Material Adverse Effect.

                  SECTION 3.12. Credit Utilization. At any time prior to the
occurrence of both the Quaker State Credit Facility Termination and the merger
of Quaker State Corporation and a Wholly Owned Subsidiary of the Borrower, the
"aggregate utilization" under this Agreement and the Prior Credit Facility or
the PennzEnergy Credit Facility, as applicable, does not exceed $1,000,000,000.
For purposes of this Section 3.12, "aggregate utilization" means the amount
equal at any time to the sum of (a) with respect to this Agreement, the
aggregate amount at such time of commercial paper supported by the availability
of Loan proceeds under this Agreement, the Committed Credit Exposure and the
outstanding principal amount of all Competitive Loans, plus (b)(i) if prior to
the occurrence of both the PennzEnergy Effective Date and the Prior Credit
Facility Termination, the aggregate amount at such time of commercial paper
supported by the availability of loan proceeds under the Prior Credit Facility,
plus the principal amount of loans outstanding under the Prior Credit Facility,
plus the face amount of letters of credit issued under the Prior Credit Facility
or (ii) if after the occurrence of both the PennzEnergy Effective Date and the
Prior Credit Facility Termination, the aggregate amount at such time of
commercial paper supported by the availability of loan proceeds under the
PennzEnergy Credit Facility, plus the principal amount of loans outstanding
under the PennzEnergy Credit Facility, plus the face amount of letters of credit
issued under the PennzEnergy Credit Facility.



                                   ARTICLE IV

                                   Conditions

                  SECTION 4.01. Effective Date. The obligations of the Lenders
to make the initial Loans and of the Issuing Bank to issue the initial Letters
of Credit hereunder shall not become effective until the date on which each of
the following conditions is satisfied (or waived in accordance with Section
9.02):

                  (a) The Administrative Agent (or its counsel) shall have
received from each party hereto either (i) a counterpart of this Agreement
signed on behalf of such party or (ii) written evidence satisfactory to the
Administrative Agent (which may include telecopy transmission of a signed
signature page of this Agreement) that such party has signed a counterpart of
this Agreement.

                  (b) The Administrative Agent shall have received a favorable
written opinion (addressed to the Administrative Agent and the Lenders and dated
the Effective Date) of Baker & Botts L.L.P.,

 

<PAGE>   41



                                                                              37

counsel for the Borrower, in the form of Exhibit B. The Borrower hereby requests
such counsel to deliver such opinion.

                  (c) The Administrative Agent shall have received such
documents and certificates as the Administrative Agent or its counsel may
reasonably request on or before the Effective Date relating to the organization,
existence and good standing of the Borrower, the authorization of the
Transactions and any other legal matters relating to the Borrower, this
Agreement or the Transactions, all in form and substance reasonably satisfactory
to the Administrative Agent and its counsel.

                  (d) The Administrative Agent shall have received a
certificate, dated the Effective Date and signed by the President, a Vice
President or a Financial Officer of the Borrower, confirming compliance with the
conditions set forth in paragraphs (a) and (b) of Section 4.02.

                  (e) The Administrative Agent shall have received all fees and
other amounts due and payable by the Borrower on or prior to the Effective Date,
including, to the extent invoiced at least 3 days prior to the Effective Date,
reimbursement or payment of all reasonable and documented out-of-pocket expenses
required to be reimbursed or paid by the Borrower hereunder.

The Administrative Agent shall notify the Borrower and the Lenders of the
Effective Date, and such notice shall be conclusive and binding. Notwithstanding
the foregoing, the obligations of the Lenders to make Loans and of the Issuing
Bank to issue Letters of Credit hereunder shall not become effective unless each
of the foregoing conditions is satisfied (or waived pursuant to Section 9.02).

                  SECTION 4.02. Each Credit Event. The obligation of each Lender
to make a Loan on the occasion of any Borrowing (which is not a conversion or a
continuation of a Loan as provided in Section 2.07), and of the Issuing Bank to
issue, amend, renew or extend any Letter of Credit which increases the LC
Exposure, is subject to the satisfaction of the following conditions (unless
waived in accordance with Section 9.02):

                  (a) The representations and warranties of the Borrower set
forth in Article III of this Agreement (except those that by their terms are
limited to a specified date which shall be true and correct as of such specified
date) shall be true and correct on and as of the date of such Borrowing or the
date of issuance, amendment, renewal or extension of such Letter of Credit, as
applicable.

                  (b) At the time of and immediately after giving effect to such
Borrowing or the issuance, amendment, renewal or extension of such Letter of
Credit, as applicable, no Default shall have occurred and be continuing.

Each such Borrowing and each such issuance, amendment, renewal or extension of a
Letter of Credit shall be deemed to constitute a representation and warranty by
the Borrower on the date thereof as to the matters specified in paragraphs (a)
and (b) of this Section.



 

<PAGE>   42



                                                                              38

                                    ARTICLE V

                              Affirmative Covenants

                  Until the Commitments have expired or been terminated and the
principal of and interest on each Loan and all fees payable hereunder shall have
been paid in full and all Letters of Credit shall have expired, terminated or
are fully cash collateralized and all LC Disbursements shall have been
reimbursed, the Borrower covenants and agrees with the Lenders that:

                  SECTION 5.01. Financial Statements and Other Information. The
Borrower will furnish to the Administrative Agent and with a copy for each
Lender:

                  (a) within five Business Days after filing the Annual Report
on Form 10-K of the Borrower for the fiscal year then ended with the Securities
and Exchange Commission, but in no event later than 120 days after the end of
such fiscal year, the financial statements for such fiscal year as contained in
such Annual Report on Form 10-K, and, as soon as it shall become available, the
annual report to shareholders of the Borrower for the fiscal year then ended;

                  (b) within five Business Days after filing the Quarterly
Report on Form 10-Q of the Borrower for the fiscal quarter of the Borrower then
ended with the Securities and Exchange Commission, but in no event later than 60
days after the end of such fiscal quarter, copies of the financial statements
for such fiscal quarter as contained in such Quarterly Report on Form 10-Q, and,
as soon as it shall become available, the quarterly report to shareholders of
the Borrower for the fiscal quarter then ended;

                  (c) concurrently with any delivery of financial statements
under clause (a) or (b) above, a certificate of a Financial Officer of the
Borrower certifying as to whether a Default has occurred and, if a Default has
occurred, specifying the details thereof and any action taken or proposed to be
taken with respect thereto;

                  (d) promptly after the same become publicly available, copies
of all periodic and other reports, proxy statements and other materials filed by
the Borrower or any Subsidiary with the Securities and Exchange Commission, or
any Governmental Authority succeeding to any or all of the functions of said
Commission, under the Exchange Act; and

                  (e) promptly following any request therefor, such other
information regarding the operations, business affairs and financial condition
of the Borrower or any Material Subsidiary, or compliance with the terms of this
Agreement, as the Administrative Agent or any Lender may reasonably request.

                  SECTION 5.02. Notices of Material Events. Upon any Financial
Officer obtaining knowledge thereof, the Borrower will furnish to the
Administrative Agent and each Lender prompt written notice of the following:

                  (a) the occurrence of any Default;


 

<PAGE>   43



                                                                              39

                  (b) the filing or commencement of any action, suit or
proceeding by or before any arbitrator or Governmental Authority against or
affecting the Borrower or any Affiliate thereof that, if adversely determined,
could reasonably be expected to result in a Material Adverse Effect;

                  (c) the occurrence of any ERISA Event that, alone or together
with any other ERISA Events that have occurred, result in, or could reasonably
be expected to result in, a Material Adverse Effect;

                  (d) any other development that results in, or could reasonably
be expected to result in, a Material Adverse Effect; and

                  (e) the initial issuance of commercial paper supported by the
availability of Loan proceeds.

Each notice delivered under this Section shall be accompanied by a statement of
a Financial Officer or other executive officer of the Borrower setting forth the
details of the event or development requiring such notice and any action taken
or proposed to be taken with respect thereto.

                  SECTION 5.03. Existence; Conduct of Business. The Borrower
will, and will cause each of its Material Subsidiaries to, do or cause to be
done all things necessary to preserve, renew and keep in full force and effect
its legal existence and the rights, licenses, permits, privileges and franchises
used or useful in the conduct of its business, except where the failure to
preserve, renew and keep in full force and effect such rights, licenses,
permits, privileges and franchises could not reasonably be expected to result in
a Material Adverse Effect; provided that the foregoing shall not prohibit any
merger, consolidation, liquidation or dissolution permitted under Section 6.02.

                  SECTION 5.04. Payment of Obligations. The Borrower will, and
will cause each of its Material Subsidiaries to, pay its obligations, including
Tax liabilities, that, if not paid, could result in a Material Adverse Effect
before the same shall become delinquent or in default, except where (a) the
validity or amount thereof is being contested in good faith by appropriate
proceedings, and for which the Borrower or such Material Subsidiary has set
aside on its books adequate reserves with respect thereto in accordance with
GAAP or (b) the failure to make payment pending such contest could not
reasonably be expected to result in a Material Adverse Effect.

                  SECTION 5.05. Maintenance of Properties; Insurance. The
Borrower will, and will cause each of its Material Subsidiaries to, (a) keep and
maintain all property used or useful in the conduct of its business in good
working order and condition, ordinary wear and tear excepted; provided that the
foregoing shall not prohibit any sale, lease, transfer, merger, consolidation,
liquidation, or dissolution permitted under Section 6.02; and provided further,
that nothing in this Section 5.05 shall prevent the Borrower or any Subsidiary
from discontinuing the operation or maintenance of any property if such
discontinuance is, in the reasonable judgment of the Borrower, desirable in the
conduct of its business or the business of any Subsidiary, and (b) maintain,
with financially sound and reputable insurance companies, insurance in such
amounts and against such risks as are customarily maintained by companies
engaged in the same or similar businesses operating in the same or similar
locations.


 

<PAGE>   44



                                                                              40

                  SECTION 5.06. Books and Records; Inspection Rights. The
Borrower will, and will cause each of its Material Subsidiaries to, keep proper
books of record and account in which full, true and correct entries are made of
all dealings and transactions in relation to its business and activities as
required by GAAP. The Borrower will, and will cause each of its Subsidiaries to,
permit any representatives designated by the Administrative Agent or any Lender,
upon reasonable prior notice, to visit and inspect its properties, to examine
and make extracts from its books and records, and to discuss its affairs,
finances and condition with its officers, directors and its independent
accountants, all at such reasonable times and as often as reasonably requested
provided however, that with respect to discussions with the Borrower's
independent accountants, the Borrower shall be given the opportunity to have a
representative present during such discussions; provided, further,
notwithstanding the provisions of Section 9.03 the Administrative Agent or the
Lender making such inspection and visitation hereby releases the Borrower, its
Affiliates, and their officers, directors, employees, and agents against any
claim for injury to the Administrative Agent or such Lender (or the
representatives thereof) during such inspection and visitation; provided,
further, that neither the Borrower nor any of its Subsidiaries shall be required
to disclose to the Administrative Agent, any Lender or any agents or
representatives thereof any information which is the subject of attorney-client
privilege or attorney's work-product privilege properly asserted by the
applicable Person to prevent the loss of such privilege in connection with such
information. The Borrower shall pay or reimburse the reasonable and documented
expenses of the inspections and visitations made by the Administrative Agent and
any Lender pursuant to this Section 5.06, except that such expenses shall not be
the responsibility of the Borrower more than once per calendar year, unless a
Default has occurred and is continuing at the time of the inspection and
visitation, in which case the Borrower shall pay or reimburse such expenses.

                  SECTION 5.07. Compliance with Laws. The Borrower will, and
will cause each of its Material Subsidiaries to, comply with all laws, rules,
regulations and orders of any Governmental Authority (including, without
limitation, Environmental Laws) applicable to it or its property, except where
the failure to do so, individually or in the aggregate, could not reasonably be
expected to result in a Material Adverse Effect on the Borrower and its Material
Subsidiaries, taken as a whole.

                  SECTION 5.08. Use of Proceeds and Letters of Credit. The
proceeds of the Loans will be used only for working capital and general
corporate purposes. No part of the proceeds of any Loan will be used, whether
directly or indirectly, for any purpose that entails a violation of any of the
Regulations of the Board, including Regulations U and X. Letters of Credit will
be issued only to support the general corporate requirements of the Borrower and
its Subsidiaries.

                  SECTION 5.09. Covenant Cross-Default. In connection with the
incurrence by the Borrower or any Material Subsidiary of any obligation for
borrowed money on terms that provide that an event of default shall exist with
respect to such obligation if the Borrower or such Material Subsidiary, as
applicable, defaults in the performance of any agreement, term or condition
(other than the payment of principal or interest) in any other agreement or
instrument (a "Covenant Cross-Default") under or by which any other obligation
of the Borrower or any Material Subsidiary for borrowed money is created or
evidenced or secured, the Borrower shall execute an instrument in form
satisfactory to the Administrative Agent, to be delivered prior to such
incurrence, agreeing that such Covenant Cross-Default shall also constitute an
Event of Default under this Agreement; provided, however, that this Section 5.09
shall not apply to any obligation of a Material Subsidiary for borrowed money in
an amount

 

<PAGE>   45



                                                                              41

less than $50,000,000; and provided further that the Quaker State Cross Defaults
shall not constitute Covenant Cross-Defaults for purposes of this Section 5.09.


                                   ARTICLE VI

                               Negative Covenants

                  Until the Commitments have expired or terminated and the
principal of and interest on each Loan and all fees payable hereunder have been
paid in full and all Letters of Credit have expired, terminated or are fully
cash collateralized and all LC Disbursements shall have been reimbursed, the
Borrower covenants and agrees with the Lenders that:

                  SECTION 6.01. Liens. The Borrower will not, and will not
permit any Material Subsidiary to pledge, mortgage, hypothecate or grant a
security interest in, or permit any Lien upon, any property or assets owned by
the Borrower or any Material Subsidiary to secure any Indebtedness, without
making effective provision whereby the outstanding Loans shall (so long as such
other Indebtedness shall be so secured) be equally and ratably secured with any
and all such other Indebtedness and any other indebtedness similarly entitled to
be equally and ratably secured; provided, however, that this restriction shall
not apply to nor prevent the creation or existence of:

                  (a) any Lien upon any property or assets (together with
receivables and intangibles related to such property or assets and the cash
proceeds thereof) created at the time of the acquisition or construction of such
property or assets by the Borrower or any Material Subsidiary or within one year
after such time to secure all or a portion of the purchase price or construction
costs (or Indebtedness incurred to finance such purchase price or construction
costs) for such property or assets;

                  (b) any Lien upon any property or assets (together with
receivables and intangibles related to such property or assets and the cash
proceeds thereof) existing thereon at the time of the acquisition thereof by the
Borrower or any Material Subsidiary (whether or not the obligations secured
thereby are assumed by the Borrower or any Subsidiary);

                  (c) any Lien upon any property or assets (together with
receivables and intangibles related to such property or assets and the cash
proceeds thereof), whenever acquired, of any Person that becomes a Material
Subsidiary after the date hereof, provided that (i) the instrument creating such
Lien shall be in effect prior to the time such Person becomes a Material
Subsidiary and (ii) such Lien shall only apply to properties or assets (together
with receivables and intangibles related to such property or assets and the cash
proceeds thereof) owned by such Person at the time it becomes a Material
Subsidiary or thereafter acquired by it from sources other than the Borrower or
another Material Subsidiary;

                  (d) any extension, renewal or refunding of any Lien permitted
by Subsection (a), (b) or (c) above on substantially the same property or assets
theretofore subject thereto;

                  (e) any Lien in favor of the Borrower and any Lien created or
assumed by a Subsidiary in favor of another Subsidiary;


 

<PAGE>   46



                                                                              42

                  (f) any Lien created or assumed by the Borrower or a Material
Subsidiary in connection with the issuance of debt securities the interest on
which is excludable from gross income of the holder of such security pursuant to
the Internal Revenue Code of 1986, as amended, for the purpose of financing, in
whole or in part, the acquisition or construction of property or assets to be
used by the Borrower or a Subsidiary;

                  (g) any Lien securing any Indebtedness in an amount which,
together with all other Indebtedness secured by a Lien that is not otherwise
permitted by the provisions of this Section 6.01 does not at the time of the
incurrence of the Indebtedness so secured exceed 5% of Consolidated Net Tangible
Assets of the Borrower and its Material Subsidiaries as at the end of the most
recent quarter; or

                  (h) any Lien existing in connection with any sale,
securitization or monetization of receivables or other rights to receive payment
of the Borrower and any of its Subsidiaries, so long as such sale,
securitization or monetization is treated as a sale pursuant to the Statement on
Financial Accounting Standards No. 125.

         In case the Borrower or any Material Subsidiary shall propose to
pledge, mortgage, hypothecate or grant a security interest in any property or
assets owned by the Borrower or any Material Subsidiary to secure any
Indebtedness, other than as permitted by subdivisions (a) to (h), inclusive, of
this Section 6.01, the Borrower will prior thereto give written notice thereof
to the Administrative Agent, and the Borrower will, or will cause such Material
Subsidiary to, prior to or simultaneously with such pledge, mortgage,
hypothecation or grant of security interest, by executed instrument in form
satisfactory to the Administrative Agent, effectively secure (for so long as
such other Indebtedness shall be so secured) all the Loans equally and ratably
with such Indebtedness and with any other indebtedness similarly entitled to be
equally and ratably secured. Such instrument shall contain provisions concerning
the possession, control, release and substitution of mortgaged and pledged
property and Loans and other appropriate matters as the Borrower and the
Administrative Agent shall deem advisable or appropriate or as the
Administrative Agent shall deem necessary in connection with such pledge,
mortgage, hypothecation or grant of security interest.

         For the purpose of this Section 6.01 the term "Lien" shall include the
interest of the lessor under a lease with a term of three years or more that
should be, in accordance with GAAP, recorded as a capital lease and incurred
after the Effective Date, and any such lease of property or assets not acquired
from the Borrower or any Material Subsidiary in contemplation of such lease
shall be treated as though the lessee had purchased such property or assets from
the lessor.

                  SECTION 6.02. Fundamental Changes. (a) The Borrower will not,
and will not permit any Material Subsidiary to, merge into or consolidate with
any other Person, or permit any other Person to merge into or consolidate with
it, or sell, transfer, lease or otherwise dispose of (in one transaction or in a
series of transactions) all or substantially all of its assets, or all or
substantially all of the stock of any of its Material Subsidiaries (in each
case, whether now owned or hereafter acquired), or liquidate or dissolve, except
that, if at the time thereof and immediately after giving effect thereto no
Default shall have occurred and be continuing (i) any Person may merge into the
Borrower in a transaction in which the Borrower is the surviving corporation or
the surviving Person is a domestic entity and expressly assumes the obligations
of the Borrower under this Agreement, (ii) any Person may merge into any

 

<PAGE>   47



                                                                              43

Subsidiary in a transaction in which the surviving entity is a Subsidiary, (iii)
any Subsidiary may sell, transfer, lease or otherwise dispose of its assets to
the Borrower or to another Subsidiary and (iv) any Subsidiary may liquidate or
dissolve if the Borrower determines in good faith that such liquidation or
dissolution is in the best interests of the Borrower and is not materially
disadvantageous to the Lenders; provided that any such merger involving a Person
that is not a Wholly Owned Subsidiary immediately prior to such merger shall not
be permitted unless also permitted by Section 6.03.

                  (b) The Borrower will not, and will not permit any of its
Subsidiaries to, engage to any material extent in any business that would change
the character of the business of the Borrower and its Subsidiaries, taken as a
whole, from that in existence on the Merger Date.

                  SECTION 6.03. Investments, Loans, Advances, Guarantees and
Acquisitions. The Borrower will not, and will not permit any of its Material
Subsidiaries to, purchase, hold or acquire (including pursuant to any merger
with any Person that was not a Wholly Owned Subsidiary prior to such merger) any
capital stock, evidences of indebtedness or other securities (including any
option, warrant or other right to acquire any of the foregoing) of, make or
permit to exist any loans or advances to, Guarantee any obligations of, or make
or permit to exist any investment or any other interest in, any other Person, or
purchase or otherwise acquire (in one transaction or a series of transactions)
any assets of any other Person constituting a business unit, if any such loan
advance, Guarantee, acquisition or investment would change the character of the
business of the Borrower and its Subsidiaries, taken as a whole, from that in
existence on the Effective Date; provided, that after the occurrence of the
merger of Quaker State Corporation and a Wholly Owned Subsidiary of the
Borrower, thereafter from that in existence on the date of such merger..


                                   ARTICLE VII

                                Events of Default

                  If any of the following events ("Events of Default") shall
occur:

                  (a) the Borrower shall fail to pay any principal of any Loan
or any reimbursement obligation in respect of any LC Disbursement when and as
the same shall become due and payable, whether at the due date thereof or at a
date fixed for prepayment thereof or otherwise;

                  (b) the Borrower shall fail to pay any interest on any Loan
when and as the same shall become due and payable, and such failure shall
continue unremedied for a period of five Business Days or the Borrower shall
fail to pay any fee or any other amount (other than an amount referred to in
clause (a) of this Article) payable under this Agreement, when and as the same
shall become due and payable, and such failure shall continue unremedied for a
period of fifteen Business Days;

                  (c) any representation or warranty made or deemed made by or
on behalf of the Borrower or any Subsidiary in this Agreement shall prove to
have been incorrect in any material respect when made or deemed made;


 

<PAGE>   48



                                                                              44

                  (d) the Borrower shall fail to observe or perform any
covenant, condition or agreement contained in Section 5.02, 5.03 (with respect
to the Borrower's existence) or 5.08 or in Article VI;

                  (e) the Borrower shall fail to observe or perform any
covenant, condition or agreement contained in this Agreement (other than those
specified in clause (a), (b) or (d) of this Article), and such failure shall
continue unremedied for a period of 30 days after notice thereof from the
Administrative Agent to the Borrower (which notice will be given at the request
of any Lender);

                  (f) the Borrower or any Subsidiary shall fail to make any
payment (whether of principal or interest and regardless of amount) in respect
of any Material Indebtedness, when and as the same shall become due and payable
after giving effect to any period of grace with respect thereto;

                  (g) any event or condition occurs that results in any Material
Indebtedness becoming due prior to its scheduled maturity or that results in any
Material Indebtedness being required to be prepaid, repurchased, redeemed or
defeased prior to its scheduled maturity; provided that this clause (g) shall
not apply to secured Indebtedness that becomes due as a result of the voluntary
sale or transfer of the property or assets securing such Indebtedness;

                  (h) an involuntary proceeding shall be commenced or an
involuntary petition shall be filed seeking (i) liquidation, reorganization or
other relief in respect of the Borrower or any Subsidiary that is not a De
Minimis Subsidiary or its debts, or of a substantial part of its assets, under
any Federal, state or foreign bankruptcy, insolvency, receivership or similar
law now or hereafter in effect or (ii) the appointment of a receiver, trustee,
custodian, sequestrator, conservator or similar official for the Borrower or any
Subsidiary that is not a De Minimis Subsidiary or for a substantial part of its
assets, and, in any such case, such proceeding or petition shall continue
undismissed for 60 days or an order or decree approving or ordering any of the
foregoing shall be entered;

                  (i) the Borrower or any Subsidiary that is not a De Minimis
Subsidiary shall (i) voluntarily commence any proceeding or file any petition
seeking liquidation, reorganization or other relief under any Federal, state or
foreign bankruptcy, insolvency, receivership or similar law now or hereafter in
effect, (ii) consent to the institution of, or fail to contest in a timely and
appropriate manner, any proceeding or petition described in clause (h) of this
Article, (iii) apply for or consent to the appointment of a receiver, trustee,
custodian, sequestrator, conservator or similar official for the Borrower or any
Subsidiary that is not a De Minimis Subsidiary or for a substantial part of its
assets, (iv) file an answer admitting the material allegations of a petition
filed against it in any such proceeding, (v) make a general assignment for the
benefit of creditors or (vi) take any action for the purpose of effecting any of
the foregoing;

                  (j) the Borrower or any Subsidiary that is not a De Minimis
Subsidiary shall become unable, admit in writing its inability or fail generally
to pay its debts as they become due;

                  (k) one or more judgments for the payment of money in an
aggregate amount in excess of $50,000,000 in excess of insurance in respect
thereof shall be rendered against the Borrower, any Subsidiary that is not a De
Minimis Subsidiary or any combination thereof and the same shall remain
undischarged for a period of 45 consecutive days during which execution shall
not be effectively stayed,

 

<PAGE>   49



                                                                              45

or any action shall be legally taken by a judgment creditor to attach or levy
upon any assets of the Borrower or any Subsidiary that is not a De Minimis
Subsidiary to enforce any such judgment; or

                  (l) an ERISA Event shall have occurred that when taken
together with all other ERISA Events that have occurred, could reasonably be
expected to result in a Material Adverse Effect;

then, and in every such event (other than an event with respect to the Borrower
described in clause (h) or (i) of this Article), and at any time thereafter
during the continuance of such event, the Administrative Agent may, and at the
request of the Required Lenders shall, by notice to the Borrower, take either or
both of the following actions, at the same or different times: (i) terminate the
Commitments, and thereupon the Commitments shall terminate immediately, and (ii)
declare the Loans then outstanding to be due and payable in whole (or in part,
in which case any principal not so declared to be due and payable may thereafter
be declared to be due and payable), and thereupon the principal of the Loans so
declared to be due and payable, together with accrued interest thereon and all
fees and other obligations of the Borrower accrued hereunder, shall become due
and payable immediately, without presentment, demand, protest or other notice of
any kind, all of which are hereby waived by the Borrower; and in case of any
event with respect to the Borrower described in clause (h) or (i) of this
Article, the Commitments shall automatically terminate and the principal of the
Loans then outstanding, together with accrued interest thereon and all fees and
other obligations of the Borrower accrued hereunder, shall automatically become
due and payable, without presentment, demand, protest or other notice of any
kind, all of which are hereby waived by the Borrower.


                                  ARTICLE VIII

                            The Administrative Agent

                  Each of the Lenders and the Issuing Bank hereby irrevocably
appoints the Administrative Agent as its agent and authorizes the Administrative
Agent to take such actions on its behalf and to exercise such powers as are
delegated to the Administrative Agent by the terms hereof, together with such
actions and powers as are reasonably incidental thereto.

                  The bank serving as the Administrative Agent hereunder shall
have the same rights and powers in its capacity as a Lender as any other Lender
and may exercise the same as though it were not the Administrative Agent, and
such bank and its Affiliates may accept deposits from, lend money to and
generally engage in any kind of business with the Borrower or any Subsidiary or
other Affiliate thereof as if it were not the Administrative Agent hereunder.

                  The Administrative Agent shall not have any duties or
obligations except those expressly set forth herein. Without limiting the
generality of the foregoing, (a) the Administrative Agent shall not be subject
to any fiduciary or other implied duties, regardless of whether a Default has
occurred and is continuing, (b) the Administrative Agent shall not have any duty
to take any discretionary action or exercise any discretionary powers, except
discretionary rights and powers expressly contemplated hereby that the
Administrative Agent is required to exercise in writing by the Required Lenders
(or such other number or percentage of the Lenders as shall be necessary under
the circumstances as provided in Section 9.02), and (c) except as expressly set
forth herein, the Administrative Agent shall not have

 

<PAGE>   50



                                                                              46

any duty to disclose, and shall not be liable for the failure to disclose, any
information relating to the Borrower or any of its Subsidiaries that is
communicated to or obtained by the bank serving as Administrative Agent or any
of its Affiliates in any capacity. The Administrative Agent shall not be liable
to the Lenders for any action taken or not taken by it with the consent or at
the request of the Required Lenders (or such other number or percentage of the
Lenders as shall be necessary under the circumstances as provided in Section
9.02) or in the absence of its own gross negligence or wilful misconduct. The
Administrative Agent shall be deemed not to have knowledge of any Default unless
and until written notice thereof is given to the Administrative Agent by the
Borrower or a Lender, and the Administrative Agent shall not be responsible for
or have any duty to ascertain or inquire into (i) any statement, warranty or
representation made in or in connection with this Agreement, (ii) the contents
of any certificate, report or other document delivered hereunder or in
connection herewith, (iii) the performance or observance of any of the
covenants, agreements or other terms or conditions set forth herein, (iv) the
validity, enforceability, effectiveness or genuineness of this Agreement or any
other agreement, instrument or document, or (v) the satisfaction of any
condition set forth in Article IV or elsewhere herein, other than to confirm
receipt of items expressly required to be delivered to the Administrative Agent.

                  The Administrative Agent shall be entitled to rely upon, and
shall not incur any liability for relying upon, any notice, request,
certificate, consent, statement, instrument, document or other writing believed
by it to be genuine and to have been signed or sent by the proper Person. The
Administrative Agent also may rely upon any statement made to it orally or by
telephone and believed by it to be made by the proper Person, and shall not
incur any liability for relying thereon. The Administrative Agent may consult
with legal counsel (who may be counsel for the Borrower), independent
accountants and other experts selected by it, and shall not be liable to the
Lenders for any action taken or not taken by it in accordance with the advice of
any such counsel, accountants or experts.

                  The Administrative Agent may perform any and all its duties
and exercise its rights and powers by or through any one or more sub-agents
appointed by the Administrative Agent. The Administrative Agent and any such
sub-agent may perform any and all its duties and exercise its rights and powers
through their respective Related Parties. The exculpatory provisions of the
preceding paragraphs shall apply to any such sub-agent and to the Related
Parties of the Administrative Agent and any such sub-agent, and shall apply to
their respective activities in connection with the syndication of the credit
facilities provided for herein as well as activities as Administrative Agent.

                  Subject to the appointment and acceptance of a successor
Administrative Agent as provided in this paragraph, the Administrative Agent may
resign at any time by notifying the Lenders, the Issuing Bank and the Borrower.
Upon any such resignation, the Required Lenders shall have the right, to appoint
a successor and, if there is no Default or Event of Default, the Borrower shall
have the right to consent, in writing, prior to the appointment of a successor,
provided that such consent shall not be unreasonably withheld. If no successor
shall have been so appointed by the Required Lenders and shall have accepted
such appointment within 30 days after the retiring Administrative Agent gives
notice of its resignation, then the retiring Administrative Agent may, on behalf
of the Lenders and the Issuing Bank, appoint a successor Administrative Agent
which shall be a commercial bank engaged or licensed to conduct banking business
under the laws of the United States or a state thereof with an office in New
York, New York, or an Affiliate of any such bank that maintains an office in the
United States and will administer this Agreement from such office. Upon the
acceptance of its appointment as Administrative

 

<PAGE>   51



                                                                              47

Agent hereunder by a successor, such successor shall succeed to and become
vested with all the rights, powers, privileges and duties of the retiring
Administrative Agent, and the retiring Administrative Agent shall be discharged
from its duties and obligations hereunder. The fees payable by the Borrower to a
successor Administrative Agent shall be the same as those payable to its
predecessor unless otherwise agreed between the Borrower and such successor.
After the Administrative Agent's resignation hereunder, the provisions of this
Article and Section 9.03 shall continue in effect for the benefit of such
retiring Administrative Agent, its sub-agents and their respective Related
Parties in respect of any actions taken or omitted to be taken by any of them
while it was acting as Administrative Agent.

                  Each Lender acknowledges that it has, independently and
without reliance upon the Administrative Agent or any other Lender and based on
such documents and information as it has deemed appropriate, made its own credit
analysis and decision to enter into this Agreement. Each Lender also
acknowledges that it will, independently and without reliance upon the
Administrative Agent or any other Lender and based on such documents and
information as it shall from time to time deem appropriate, continue to make its
own decisions in taking or not taking action under or based upon this Agreement,
any related agreement or any document furnished hereunder or thereunder. Each
Lender acknowledges that Vinson & Elkins L.L.P. is acting in the Transactions as
special counsel to the Administrative Agent only. Each Lender will consult with
its own legal counsel to the extent that is deems necessary in connection with
the Transactions.

         None of the Documentation Agent, the Syndication Agent or any Co-Agent
shall have any duties or responsibilities hereunder in its capacity as such.


                                   ARTICLE IX

                                  Miscellaneous

                  SECTION 9.01. Notices. Except in the case of notices and other
communications expressly permitted to be given by telephone, all notices and
other communications provided for herein shall be in writing and shall be
delivered by hand or overnight courier service, mailed by certified or
registered mail or sent by telecopy, as follows:

                  (a)      if to the Borrower, to it at 700 Milam, Houston,
                           Texas 77002, Attention: Assistant Treasurer (Telecopy
                           No. (713) 546-6040);

                  (b)      if to the Administrative Agent, to it at Chase Bank
                           of Texas, National Association, c/o Chase Securities
                           Inc., 600 Travis Street, 20th Floor, Houston, Texas
                           77002 Attention: Peter Licalzi, (Telecopy No. (713)
                           216-4117);

                  (c)      if to the Issuing Bank, to it at Chase Bank of Texas,
                           National Association, 712 Main Street, Mezzanine
                           South, Houston, Texas 77002, Attention: Mary Ellen
                           Coffey (Telecopy No. (713) 216-4499); and

                  (d)      if to any other Lender, to it at its address (or
                           telecopy number) set forth in its Administrative
                           Questionnaire.

 

<PAGE>   52



                                                                              48

Any party hereto may change its address or telecopy number for notices and other
communications hereunder by notice to the other parties hereto. All notices and
other communications given to any party hereto in accordance with the provisions
of this Agreement shall be deemed to have been given on the date of receipt.

                  SECTION 9.02. Waivers; Amendments. (a) No failure or delay by
the Administrative Agent, the Issuing Bank or any Lender in exercising any right
or power hereunder shall operate as a waiver thereof, nor shall any single or
partial exercise of any such right or power, or any abandonment or
discontinuance of steps to enforce such a right or power, preclude any other or
further exercise thereof or the exercise of any other right or power. The rights
and remedies of the Administrative Agent, the Issuing Bank and the Lenders
hereunder are cumulative and are not exclusive of any rights or remedies that
they would otherwise have. No waiver of any provision of this Agreement or
consent to any departure by the Borrower therefrom shall in any event be
effective unless the same shall be permitted by paragraph (b) of this Section,
and then such waiver or consent shall be effective only in the specific instance
and for the purpose for which given. Without limiting the generality of the
foregoing, the making of a Loan or issuance of a Letter of Credit shall not be
construed as a waiver of any Default, regardless of whether the Administrative
Agent, any Lender or the Issuing Bank may have had notice or knowledge of such
Default at the time.

                  (b) Neither this Agreement nor any provision hereof may be
waived, amended or modified except pursuant to an agreement or agreements in
writing entered into by the Borrower and the Required Lenders or by the Borrower
and the Administrative Agent with the consent of the Required Lenders; provided
that no such agreement shall (i) increase the Commitment of any Lender without
the written consent of such Lender, (ii) reduce the principal amount of any Loan
or LC Disbursement or reduce the rate of interest thereon, or reduce any fees
payable hereunder, without the written consent of each Lender affected thereby,
(iii) postpone the scheduled date of payment of the principal amount of any Loan
or LC Disbursement, or any interest thereon, or any fees payable hereunder, or
reduce the amount of, waive or excuse any such payment, or postpone the
scheduled date of expiration of any Commitment, without the written consent of
each Lender affected thereby, (iv) change Section 2.17(b) or (c) in a manner
that would alter the pro rata sharing of payments required thereby, without the
written consent of each Lender, or (v) change any of the provisions of this
Section or the definition of "Required Lenders" or any other provision hereof
specifying the number or percentage of Lenders required to waive, amend or
modify any rights hereunder or make any determination or grant any consent
hereunder, without the written consent of each Lender; provided further that no
such agreement shall amend, modify or otherwise affect the rights or duties of
the Administrative Agent or the Issuing Bank hereunder without the prior written
consent of the Administrative Agent or the Issuing Bank, as the case may be.

                  SECTION 9.03. Expenses; Indemnity; Damage Waiver. (a) The
Borrower shall pay (i) all reasonable and documented out-of-pocket expenses
incurred by the Administrative Agent and its Affiliates, including the
reasonable and documented fees, charges and disbursements of counsel for the
Administrative Agent, in connection with the syndication of the credit
facilities provided for herein, the preparation and administration of this
Agreement or any amendments, modifications or waivers of the provisions hereof
(whether or not the transactions contemplated hereby or thereby shall be
consummated), (ii) all reasonable and documented out-of-pocket expenses incurred
by the Issuing Bank in connection with the issuance, amendment, renewal or
extension of any Letter of Credit or any demand

 

<PAGE>   53



                                                                              49

for payment thereunder and (iii) all out-of-pocket expenses incurred by the
Administrative Agent, the Issuing Bank or any Lender, including the reasonable
and documented fees, charges and disbursements of any counsel for the
Administrative Agent, the Issuing Bank or any Lender, in connection with the
enforcement or protection of its rights in connection with this Agreement,
including its rights under this Section, or in connection with the Loans made or
Letters of Credit issued hereunder, including all such out-of-pocket expenses
incurred during any workout, restructuring or negotiations in respect of such
Loans or Letters of Credit.

                  (b) The Borrower shall indemnify the Administrative Agent, the
Issuing Bank and each Lender, and each Related Party of any of the foregoing
Persons (each such Person being called an "Indemnitee") against, and hold each
Indemnitee harmless from, any and all losses, claims, damages, liabilities and
related expenses, including the reasonable and documented fees, charges and
disbursements of any counsel for any Indemnitee, incurred by or asserted against
any Indemnitee arising out of, in connection with, or as a result of (i) the
execution or delivery of this Agreement or any agreement or instrument
contemplated hereby, the performance by the parties hereto of their respective
obligations hereunder or the consummation of the Transactions or any other
transactions contemplated hereby, (ii) any Loan or Letter of Credit or the use
of the proceeds therefrom (including any refusal by the Issuing Bank to honor a
demand for payment under a Letter of Credit if the documents presented in
connection with such demand do not strictly comply with the terms of such Letter
of Credit), (iii) any actual or alleged presence or release of Hazardous
Materials on or from any property owned or operated by the Borrower or any of
its Subsidiaries, or any Environmental Liability related in any way to the
Borrower or any of its Subsidiaries, or (iv) any actual or prospective claim,
litigation, investigation or proceeding relating to any of the foregoing,
whether based on contract, tort or any other theory and regardless of whether
any Indemnitee is a party thereto; provided that such indemnity shall not, as to
any Indemnitee, be available to the extent that such losses, claims, damages,
liabilities or related expenses are determined by a court of competent
jurisdiction by final and nonappealable judgment to have resulted from the gross
negligence or wilful misconduct of any Indemnitee or arise between Indemnitees.

                  (c) To the extent that the Borrower fails to pay any amount
required to be paid by it to the Administrative Agent or the Issuing Bank under
paragraph (a) or (b) of this Section, each Lender severally agrees to pay to the
Administrative Agent or the Issuing Bank, as the case may be, such Lender's
Applicable Percentage (determined as of the time that the applicable
unreimbursed expense or indemnity payment is sought) of such unpaid amount;
provided that the unreimbursed expense or indemnified loss, claim, damage,
liability or related expense, as the case may be, was incurred by or asserted
against the Administrative Agent or the Issuing Bank in its capacity as such.

                  (d) To the extent permitted by applicable law, the Borrower
shall not assert, and hereby waives, any claim against any Indemnitee, on any
theory of liability, for special, indirect, consequential or punitive damages
(as opposed to direct or actual damages) arising out of, in connection with, or
as a result of, this Agreement or any agreement or instrument contemplated
hereby, the Transactions, any Loan or Letter of Credit or the use of the
proceeds thereof.

                  (e) All amounts due under this Section shall be payable
promptly after written demand therefor.


 

<PAGE>   54



                                                                              50

                  (f) Each Indemnitee shall give prompt notice to the Borrower
of any claim for indemnification under this Section 9.03 by such Indemnitee and
shall consult with the Borrower in the conduct of such Indemnitee's legal
defense of such claim; provided, however, that an Indemnitee's failure to give
such prompt notice to the Borrower or to seek such consultation with the
Borrower shall not constitute a defense to any claim for indemnification by such
Indemnitee unless, and only to the extent that, such failure materially
prejudices the Borrower.

                  SECTION 9.04. Successors and Assigns. (a) The provisions of
this Agreement shall be binding upon and inure to the benefit of the parties
hereto and their respective successors and assigns permitted hereby (including
any Affiliate of the Issuing Bank that issues any Letter of Credit), except that
the Borrower may not assign or otherwise transfer any of its rights or
obligations hereunder without the prior written consent of each Lender (and any
attempted assignment or transfer by the Borrower without such consent shall be
null and void). Nothing in this Agreement, expressed or implied, shall be
construed to confer upon any Person (other than the parties hereto, their
respective successors and assigns permitted hereby (including any Affiliate of
the Issuing Bank that issues any Letter of Credit) and, to the extent expressly
contemplated hereby, the Related Parties of each of the Administrative Agent,
the Issuing Bank and the Lenders) any legal or equitable right, remedy or claim
under or by reason of this Agreement.

                  (b) Any Lender may assign to one or more assignees all or a
portion of its rights and obligations under this Agreement (including all or a
portion of its Commitment and the Loans at the time owing to it); provided that
(i) except in the case of an assignment to a Lender or an Affiliate of a Lender,
each of the Borrower and the Administrative Agent (and, in the case of an
assignment of all or a portion of a Commitment or any Lender's obligations in
respect of its LC Exposure, the Issuing Bank) must give their prior written
consent to such assignment (which consent shall not be unreasonably withheld),
(ii) except in the case of an assignment to a Lender or an Affiliate of a Lender
or an assignment of the entire remaining amount of the assigning Lender's
Commitment, the amount of the Commitment of the assigning Lender subject to each
such assignment (determined as of the date the Assignment and Acceptance with
respect to such assignment is delivered to the Administrative Agent) shall not
be less than $5,000,000 unless each of the Borrower and the Administrative Agent
otherwise consent, (iii) each partial assignment shall be made as an assignment
of a proportionate part of all the assigning Lender's rights and obligations
under this Agreement, except that this clause (iii) shall not apply to rights in
respect of outstanding Competitive Loans, (iv) the parties to each assignment
shall execute and deliver to the Administrative Agent an Assignment and
Acceptance, together with a processing and recordation fee of $3,500, and (v)
the assignee, if it shall not be a Lender, shall deliver to the Administrative
Agent an Administrative Questionnaire; and provided further that any consent of
the Borrower otherwise required under this paragraph shall not be required if an
Event of Default under clause (h) or (i) of Article VII has occurred and is
continuing. Subject to acceptance and recording thereof pursuant to paragraph
(d) of this Section, from and after the effective date specified in each
Assignment and Acceptance the assignee thereunder shall be a party hereto and,
to the extent of the interest assigned by such Assignment and Acceptance, have
the rights and obligations of a Lender under this Agreement, and the assigning
Lender thereunder shall, to the extent of the interest assigned by such
Assignment and Acceptance, be released from its obligations under this Agreement
(and, in the case of an Assignment and Acceptance covering all of the assigning
Lender's rights and obligations under this Agreement, such Lender shall cease to
be a party hereto but shall continue to be entitled to the benefits of Sections
2.14, 2.15, 2.16 and 9.03). Any assignment or transfer by a Lender of rights or
obligations

 

<PAGE>   55



                                                                              51

under this Agreement that does not comply with this paragraph shall be treated
for purposes of this Agreement as a sale by such Lender of a participation in
such rights and obligations in accordance with paragraph (e) of this Section.

                  (c) The Administrative Agent, acting for this purpose as an
agent of the Borrower, shall maintain at one of its offices in The City of New
York a copy of each Assignment and Acceptance delivered to it and a register for
the recordation of the names and addresses of the Lenders, and the Commitment
of, and principal amount of the Loans and LC Disbursements owing to, each Lender
pursuant to the terms hereof from time to time (the "Register"). The entries in
the Register shall be conclusive, and the Borrower, the Administrative Agent,
the Issuing Bank and the Lenders may treat each Person whose name is recorded in
the Register pursuant to the terms hereof as a Lender hereunder for all purposes
of this Agreement, notwithstanding notice to the contrary. The Register shall be
available for inspection by the Borrower, the Issuing Bank and any Lender, at
any reasonable time and from time to time upon reasonable prior notice.

                  (d) Upon its receipt of a duly completed Assignment and
Acceptance executed by an assigning Lender and an assignee, the assignee's
completed Administrative Questionnaire (unless the assignee shall already be a
Lender hereunder), the processing and recordation fee referred to in paragraph
(b) of this Section and any written consent to such assignment required by
paragraph (b) of this Section, the Administrative Agent shall accept such
Assignment and Acceptance and record the information contained therein in the
Register. No assignment shall be effective for purposes of this Agreement unless
it has been recorded in the Register as provided in this paragraph.

                  (e) Any Lender may, without the consent of the Borrower, the
Administrative Agent or the Issuing Bank, sell participations to one or more
banks or other entities (a "Participant") in all or a portion of such Lender's
rights and obligations under this Agreement (including all or a portion of its
Commitment and the Loans owing to it); provided that (i) such Lender's
obligations under this Agreement shall remain unchanged, (ii) such Lender shall
remain solely responsible to the other parties hereto for the performance of
such obligations and (iii) the Borrower, the Administrative Agent, the Issuing
Bank and the other Lenders shall continue to deal solely and directly with such
Lender in connection with such Lender's rights and obligations under this
Agreement. Any agreement or instrument pursuant to which a Lender sells such a
participation shall provide that such Lender shall retain the sole right to
enforce this Agreement and to approve any amendment, modification or waiver of
any provision of this Agreement; provided that such agreement or instrument may
provide that such Lender will not, without the consent of the Participant, agree
to any amendment, modification or waiver described in the first proviso to
Section 9.02(b) that affects such Participant. Subject to paragraph (f) of this
Section, the Borrower agrees that each Participant shall be entitled to the
benefits of Sections 2.14, 2.15 and 2.16 to the same extent as if it were a
Lender and had acquired its interest by assignment pursuant to paragraph (b) of
this Section. To the extent permitted by law, each Participant also shall be
entitled to the benefits of Section 9.08 as though it were a Lender, provided
such Participant agrees to be subject to Section 2.17(c) as though it were a
Lender. Each Lender that sell participations pursuant to this Section 9.04(e)
shall deliver a notice of such participation setting forth the purchaser thereof
to the Borrower, provided that such Lender shall not be liable for the failure
to provide such notice.


 

<PAGE>   56



                                                                              52

                  (f) A Participant shall not be entitled to receive any greater
payment under Section 2.14 or 2.16 than the applicable Lender would have been
entitled to receive with respect to the participation sold to such Participant.
A Participant that would be a Foreign Lender if it were a Lender shall not be
entitled to the benefits of Section 2.16 unless the Borrower is notified of the
participation sold to such Participant and such Participant agrees, for the
benefit of the Borrower, to comply with Section 2.16(e) as though it were a
Lender.

                  (g) Any Lender may at any time pledge or assign a security
interest in all or any portion of its rights under this Agreement to secure
obligations of such Lender, including any pledge or assignment to secure
obligations to a Federal Reserve Bank, and this Section shall not apply to any
such pledge or assignment of a security interest; provided that no such pledge
or assignment of a security interest shall release a Lender from any of its
obligations hereunder or substitute any such pledgee or assignee for such Lender
as a party hereto.

                  SECTION 9.05. Survival. All covenants, agreements,
representations and warranties made by the Borrower herein and in the
certificates or other instruments delivered in connection with or pursuant to
this Agreement shall be considered to have been relied upon by the other parties
hereto and shall survive the execution and delivery of this Agreement and the
making of any Loans and issuance of any Letters of Credit, regardless of any
investigation made by any such other party or on its behalf and notwithstanding
that the Administrative Agent, the Issuing Bank or any Lender may have had
notice or knowledge of any Default or incorrect representation or warranty at
the time any credit is extended hereunder, and shall continue in full force and
effect as long as the principal of or any accrued interest on any Loan or any
fee or any other amount payable under this Agreement is outstanding and unpaid
or any Letter of Credit is outstanding and so long as the Commitments have not
expired or terminated. The provisions of Sections 2.14, 2.15, 2.16, and 9.03 and
Article VIII shall survive and remain in full force and effect regardless of the
consummation of the transactions contemplated hereby, the repayment of the
Loans, the expiration or termination of the Letters of Credit and the
Commitments or the termination of this Agreement or any provision hereof.

                  SECTION 9.06. Counterparts; Integration; Effectiveness. This
Agreement may be executed in counterparts (and by different parties hereto on
different counterparts), each of which shall constitute an original, but all of
which when taken together shall constitute a single contract. This Agreement and
any separate letter agreements with respect to fees payable to the
Administrative Agent constitute the entire contract among the parties relating
to the subject matter hereof and supersede any and all previous agreements and
understandings, oral or written, relating to the subject matter hereof. Except
as provided in Section 4.01, this Agreement shall become effective when it shall
have been executed by the Administrative Agent and when the Administrative Agent
shall have received counterparts hereof which, when taken together, bear the
signatures of each of the other parties hereto, and thereafter shall be binding
upon and inure to the benefit of the parties hereto and their respective
successors and assigns. Delivery of an executed counterpart of a signature page
of this Agreement by telecopy shall be effective as delivery of a manually
executed counterpart of this Agreement.

                  SECTION 9.07. Severability. Any provision of this Agreement
held to be invalid, illegal or unenforceable in any jurisdiction shall, as to
such jurisdiction, be ineffective to the extent of such invalidity, illegality
or unenforceability without affecting the validity, legality and enforceability

 

<PAGE>   57



                                                                              53

of the remaining provisions hereof; and the invalidity of a particular provision
in a particular jurisdiction shall not invalidate such provision in any other
jurisdiction.

                  SECTION 9.08. Right of Setoff. If an Event of Default shall
have occurred and be continuing, each Lender and each of its Affiliates is
hereby authorized at any time and from time to time, to the fullest extent
permitted by law, to set off and apply any and all deposits (general or special,
time or demand, provisional or final) at any time held and other obligations at
any time owing by such Lender or Affiliate to or for the credit or the account
of the Borrower against any of and all the obligations of the Borrower now or
hereafter existing under this Agreement held by such Lender, irrespective of
whether or not such Lender shall have made any demand under this Agreement and
although such obligations may be unmatured. The rights of each Lender under this
Section are in addition to other rights and remedies (including other rights of
setoff) which such Lender may have.

                  SECTION 9.09. Governing Law; Jurisdiction; Consent to Service
of Process. (a) This Agreement shall be construed in accordance with and
governed by the law of the State of New York.

                  (b) The Borrower hereby irrevocably and unconditionally
submits, for itself and its property, to the nonexclusive jurisdiction of the
Supreme Court of the State of New York sitting in New York County and of the
United States District Court of the Southern District of New York, and any
appellate court from any thereof, in any action or proceeding arising out of or
relating to this Agreement, or for recognition or enforcement of any judgment,
and each of the parties hereto hereby irrevocably and unconditionally agrees
that all claims in respect of any such action or proceeding may be heard and
determined in such New York State or, to the extent permitted by law, in such
Federal court. Each of the parties hereto agrees that a final judgment in any
such action or proceeding shall be conclusive and may be enforced in other
jurisdictions by suit on the judgment or in any other manner provided by law.
Nothing in this Agreement shall affect any right that the Administrative Agent,
the Issuing Bank or any Lender may otherwise have to bring any action or
proceeding relating to this Agreement against the Borrower or its properties in
the courts of any jurisdiction.

                  (c) The Borrower hereby irrevocably and unconditionally
waives, to the fullest extent it may legally and effectively do so, any
objection which it may now or hereafter have to the laying of venue of any suit,
action or proceeding arising out of or relating to this Agreement in any court
referred to in paragraph (b) of this Section. Each of the parties hereto hereby
irrevocably waives, to the fullest extent permitted by law, the defense of an
inconvenient forum to the maintenance of such action or proceeding in any such
court.

                  (d) Each party to this Agreement irrevocably consents to
service of process in the manner provided for notices in Section 9.01. Nothing
in this Agreement will affect the right of any party to this Agreement to serve
process in any other manner permitted by law.

                  SECTION 9.10. WAIVER OF JURY TRIAL. EACH PARTY HERETO HEREBY
WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE
TO A TRIAL BY JURY IN ANY LEGAL PROCEEDING DIRECTLY OR INDIRECTLY ARISING OUT OF
OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY (WHETHER
BASED ON CONTRACT, TORT OR ANY OTHER THEORY). EACH PARTY HERETO (A) CERTIFIES
THAT NO REPRESENTATIVE,

 

<PAGE>   58



                                                                              54

AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE,
THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE
FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE
BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL
WAIVERS AND CERTIFICATIONS IN THIS SECTION.

                  SECTION 9.11. Headings. Article and Section headings and the
Table of Contents used herein are for convenience of reference only, are not
part of this Agreement and shall not affect the construction of, or be taken
into consideration in interpreting, this Agreement.

                  SECTION 9.12. Confidentiality. Each of the Administrative
Agent, the Issuing Bank and the Lenders agrees to maintain (and use reasonable
efforts to cause its respective agents and representatives to maintain) the
confidentiality of the Information (as defined below), except that Information
may be disclosed (a) to its and its Affiliates' directors, officers, employees
and agents, including accountants, legal counsel and other advisors (it being
understood that the Persons to whom such disclosure is made will be informed of
the confidential nature of such Information and instructed to keep such
Information confidential), (b) to the extent requested by any regulatory
authority, (c) to the extent required by applicable laws or regulations or by
any subpoena or similar legal process, (d) to any other party to this Agreement,
(e) in connection with the exercise of any remedies hereunder or any suit,
action or proceeding relating to this Agreement or the enforcement of rights
hereunder, (f) subject to an agreement containing provisions substantially the
same as those of this Section, to any assignee of or Participant in, or any
prospective assignee of or Participant in, any of its rights or obligations
under this Agreement, (g) with the consent of the Borrower or (h) to the extent
such Information (i) becomes publicly available other than as a result of a
breach of this Section or (ii) becomes available to the Administrative Agent,
the Issuing Bank or any Lender on a nonconfidential basis from a source other
than the Borrower. For the purposes of this Section, "Information" means all
information received from the Borrower relating to the Borrower, its
Subsidiaries, its Affiliates or their respective businesses, other than any such
information that is available to the Administrative Agent, the Issuing Bank or
any Lender on a nonconfidential basis prior to disclosure by the Borrower. Any
Person required to maintain the confidentiality of Information as provided in
this Section shall be considered to have complied with its obligation to do so
if such Person has exercised the same degree of care to maintain the
confidentiality of such Information as such Person would accord to its own
confidential information. The provisions of this Section 9.12 shall remain
operative and in full force and effect for a period of three years following the
expiration and termination of this Agreement.

                  SECTION 9.13. Interest Rate Limitation. Notwithstanding
anything herein to the contrary, if at any time the interest rate applicable to
any Loan, together with all fees, charges and other amounts which are treated as
interest on such Loan under applicable law (collectively the "Charges"), shall
exceed the maximum lawful rate (the "Maximum Rate") which may be contracted for,
charged, taken, received or reserved by the Lender holding such Loan in
accordance with applicable law, the rate of interest payable in respect of such
Loan hereunder, together with all Charges payable in respect thereof, shall be
limited to the Maximum Rate and, to the extent lawful, the interest and Charges
that would have been payable in respect of such Loan but were not payable as a
result of the operation of this Section shall be cumulated and the interest and
Charges payable to such Lender in respect of other Loans or periods shall be
increased (but not above the Maximum Rate therefor) until such cumulated amount,

 

<PAGE>   59



                                                                              55

together with interest thereon at the Federal Funds Effective Rate to the date
of repayment, shall have been received by such Lender.



 

<PAGE>   60




                  IN WITNESS WHEREOF, the parties hereto have caused this
Agreement to be duly executed by their respective authorized officers as of the
day and year first above written.


                                   PENNZOIL PRODUCTS COMPANY,
                                   as Borrower


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:


                                   CHASE BANK OF TEXAS,
                                   NATIONAL ASSOCIATION,
                                   individually and as Administrative Agent,


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:

 


                               [Signature Page-1]

<PAGE>   61




                                   CITIBANK, N.A.
                                   individually and as Syndication Agent


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:

 



                               [Signature Page-2]

<PAGE>   62




                                   MORGAN GUARANTY TRUST COMPANY
                                   OF NEW YORK,
                                   individually and as Syndication Agent


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:

 

                               [Signature Page-3]

<PAGE>   63




                                   NATIONSBANK, N.A.,
                                   individually and as Documentation Agent


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:


 
                               [Signature Page-4]

<PAGE>   64




                                   DEUTSCHE BANK AG
                                   NEW YORK BRANCH AND/OR
                                   CAYMAN ISLANDS BRANCH



                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:

                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:


 
                               [Signature Page-5]

<PAGE>   65




                                   DRESDNER BANK AG, NEW YORK AND
                                   GRAND CAYMAN BRANCHES


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:

                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:



 
                               [Signature Page-6]

<PAGE>   66




                                   ROYAL BANK OF CANADA


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:



 
                               [Signature Page-7]

<PAGE>   67




                                   THE BANK OF NOVA SCOTIA


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:



 
                               [Signature Page-8]

<PAGE>   68




                                   THE FIRST NATIONAL BANK OF CHICAGO


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:



 
                               [Signature Page-9]

<PAGE>   69




                                   MELLON BANK, N.A.


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:



 
                               [Signature Page-10]

<PAGE>   70




                                   UBS AG, STAMFORD BRANCH


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:


 
                               [Signature Page-11]

<PAGE>   71




                                   WELLS FARGO BANK (TEXAS), NATIONAL
                                   ASSOCIATION


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:



 
                               [Signature Page-12]

<PAGE>   72




                                   BANQUE NATIONALE DE PARIS,
                                   HOUSTON AGENCY


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:


 
                               [Signature Page-13]

<PAGE>   73




                                   THE BANK OF NEW YORK


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:



 
                               [Signature Page-14]

<PAGE>   74




                                   THE BANK OF TOKYO-MITSUBISHI, LTD.


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:


 
                               [Signature Page-15]

<PAGE>   75




                                   WESTDEUTSCHE LANDESBANK GIROZENTRALE,
                                   NEW YORK BRANCH


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:



 
                               [Signature Page-16]

<PAGE>   76




                                   SUNTRUST BANK, ATLANTA


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:


                                   By
                                     ------------------------------------------
                                      Name:
                                      Title:


 
                               [Signature Page-17]