Document:

<PAGE>

                                                                   EXHIBIT 10.33

Confidential treatment has been requested for portions of this exhibit.  The
copy filed here omits the information subject to the confidentiality request.
Omissions are designated as XXXXX.  A complete version of this exhibit has been
filed separately with the Securities and Exchange Commission.

                               LETTER OF INTENT

This Agreement made at Houston, Texas effective as of the 1st day of March, Two
Thousand and One, between

TIETEK, INC., a Texas corporation and wholly owned subsidiary of North American
Technologies Group, Inc., having its offices at 14315 West Hardy Road, Houston,
Texas 77060 (hereinafter called "TieTek"), and

OWENS CORNING a corporation organized and existing under the laws of the state
of Delaware (hereinafter referred to as "OC") having its principal office at
Toledo, Ohio, USA 43659.

WHEREAS TieTek has established patented composite lumber technology
("Technology") for manufacture of railroad crossties and other composite lumber
products and desires to market it,

AND WHEREAS OC is a Corporation inter-alia dealing in materials and related
technologies for various industries and has knowledge of Indian market,

AND WHEREAS the parties are desirous to enter in an agreement under the laws of
New York to jointly adapt and market this technology in India,

NOW THEREFORE, IN CONSIDERATION OF THE TERMS AND COVENANTS CONTAINED, THE
PARTIES HERETO HEREBY AGREE AS FOLLOWS:

1.  The Purpose of this Agreement is to identify the potential opportunity and
    partners in India for the TieTek Technology, including railroad crossties
    and other composite lumber products ("Products") and to jointly market the
    Technology and/or Products in the Indian market, including:

    1.1  Premixing, manufacture and/or supply of critical raw materials or
         composite lumber compound needed to manufacture Products, and/or

    1.2  The process Technology and know-how to convert raw materials and/or
         composite lumber compound into Products.

2.  The parties agree and confirm that neither party shall engage, whether
    directly or indirectly, in business in India which is within the Purpose of
    this agreement, that is, manufacture/supply of composite lumber raw
    materials and/or compound to be used with composite lumber raw materials and
    the technology to convert the compound to products, save and except through
    this agreement.

3.  OC and TieTek agree and confirm that OC will have first right of refusal for
    manufacture/supply of compound used in composite lumber technology.

                                       1
<PAGE>

4.  OC and TieTek agree and confirm that process/technology to convert
    composite lumber compound to Products will be licensed to individual Indian
    entities by TieTek independent of OC. XXXXXXXXXXXXXXXXXXXXXXXXX
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXX. If required, a
    separate agreement outlining roles and responsibilities of OC and TieTek
    will be drawn up in relation to the transfer of process/technology to
    manufacture composite lumber products.

5.  OC and TieTek agree and confirm to cooperate in the modification of the
    TieTek Technology using OC and TieTek composite technologies to develop
    Products other than the composite Crossties based on the TieTek Technology.
    If required, a separate agreement outlining the roles and responsibilities
    of OC and TieTek will be drawn up in relation to the transfer of process and
    product technologies to manufacture these other products.

6.  Until such time as a detailed and definitive agreement are concluded for
    Items 1-4 above, no rights in any of the technologies of OC or TieTek are
    created.

7.  MISCELLANOUS

    7.1 Waiver:  The failure with or without intent of any Party hereto, to
        insist upon the performance by the other of any terms or provision of
        this Agreement in strict conformity with the literal requirements hereof
        shall not be treated or deemed to constitute a modification of any terms
        or provision hereof, nor shall such failure or election be deemed to
        constitute a waiver of the right of such Party at any time whatsoever
        thereafter to insist upon performance by other strictly in accordance
        with any terms or provisions hereof.

    7.2 Severability:  If any term of this Agreement shall be hereafter
        declared by a final adjudication of any tribunal or court of competent
        jurisdiction to be illegal, such adjudication shall not alter the
        validity or enforceability of any other terms or provision unless the
        terms and provisions declared illegal shall be one expressly provided as
        a condition precedent or as the essence of this Agreement or comprises
        an integral part of, or inseparable from the remainder of this
        Agreement. In such event, the Parties shall take all necessary action
        and shall execute such other documents as may be required.

    7.3 Expenses:  Each party shall bear all expenses incurred by it in
        connection with the preparation and negotiations of this. TieTek and the
        customer shall be responsible for and bear all costs associated in
        relation to any agreements entered into between themselves.

    7.4 Notices:  All notices and other communication hereunder shall be in
        writing and shall be deemed given if delivered personally or mailed by

                                       2
<PAGE>

        registered or certified mail (return receipt requested) to the parties
        at the following addresses, or at such other address for a party as it
        shall specify in writing.

    7.5 If to OC, either prepaid registered mail or hand delivery at:

               Owens Corning
               One Owens Corning Parkway
               Toledo, Ohio 43659

               Tel:   (419) 248-7957       Fax:  (419) 248-7157

        If to TieTek, to the President either by prepaid registered mail or hand
        delivery to:

               TieTek, Inc.
               14315 West Hardy Road
               Houston, Texas 77060

               Tel:   (281) 847-0299       Fax:  (281) 847-1791

8.  Entire Agreement Modifications: This Agreement constitutes the entire
    Agreement of the parties and supersedes all other prior agreement and
    understandings, both written and oral, between the parties with respect to
    the subject matter hereof. This Agreement may be modified only by a written
    instrument signed by both parties.

     8.1  Authority: The Parties represent that they have the necessary
          corporate authority to enter into and execute this Agreement and that
          their representatives who are signing this Agreement have the
          necessary authority to sign on behalf of and bind the Parties for the
          performance of the obligations set out herein.

     8.2  No Assignment:  This Agreement may not be assigned by either party,
          other than to an Affiliate except with the written consent of the
          other party.

9.  Benefit:  This Agreement shall be binding on TieTek and OC and their
    respective successors and permitted assigns.

10. The Parties agree that each of them and their respective officers,
    directors and representatives shall not, at any time during the term of this
    Agreement or thereafter, use for its own benefit or divulge, disclose or
    communicate, to any Person, in any form or matter whatsoever, any
    information concerning any matters affecting or relating to this Agreement
    or the steps to be taken pursuant hereto; provided, that they will be
    permitted to disclose information as it is

                                       3
<PAGE>

    necessary or appropriate to perform their services hereunder or as required
    by applicable law or regulations

11. Arbitration

    11.1  Any claim or controversy arising out of, or related to, this
          Agreement, or the making, performance, breach, or interpretation
          thereof shall be finally settled by arbitration pursuant to the then
          prevailing rules of the American Arbitration Association. All
          arbitration proceedings will take place in New York.  The parties
          agree that the arbitration award shall be final and binding upon the
          parties and may be enforced in any court of competent jurisdiction;
          that such award or awards shall be the sole and exclusive remedy
          between them regarding any claims, counterclaims, issues or
          accountings presented or pled to the arbitrators; that such award or
          awards shall be made and shall be promptly payable in US dollars (free
          of any tax, deduction, or offset); and that any costs, fees or taxes
          incident to enforcing such awards shall, to the maximum extent
          permitted by law, be charged against the party resisting such
          enforcement.  The prevailing party in any such arbitration proceeding
          shall be entitled to recover its expenses, including reasonable
          attorney's fees and accounting fees, in addition to any other relief
          to which it is found entitled.  The award shall indicate interest from
          the date of any damages incurred for any breach or other violation of
          this Agreement and from the date of award until paid in full, at a
          rate to be fixed by the arbitrator, but in no event less than twelve
          percent (12%) per year or the highest rate permitted by law, whichever
          is less.

    11.2  When any dispute is under arbitration, except for the matters under
          dispute, the Parties shall continue to exercise their remaining
          respective rights and fulfill their remaining respective obligations
          under this Agreement

    11.3  Governing Law: This Agreement shall be governed by the laws of the
          State of New York.

    12    Good Faith: The parties shall in their dealings with one another in
          terms of this Agreement display good faith.

13. Validity of the Agreement

    13.1  This Agreement shall be valid until XXXXXXXXXXX or until definitive
          agreements have been executed between the Parties, whichever is
          earlier.  In the event definitive agreements have not been executed by
          XXXXXXX XXXXXX, this Agreement shall automatically stand renewed
          without the requirement of any further acts by the Parties for a
          further period until XXXXXXXXXX, at which time if definitive
          agreements have not been

                                       4
<PAGE>

          executed, this Agreement shall expire, unless specifically renewed by
          the Parties.

     13.2 Notwithstanding anything contained herein and notwithstanding the
          expiry of this Agreement, if any rights have accrued to OC to receive
          payments under the terms of this Agreement, then TieTek shall make
          such payments to OC after the expiry of this Agreement,
          notwithstanding that definitive agreements have not been executed
          between TieTek and the customer and between TieTek and OC.  This
          provision shall survive the term or the validity hereof.

IN WITNESS WHEREOF the Parties have executed this Agreement as of the date first
above written:

OWENS CORNING INC.                         TieTek Inc.

BY___________________________              BY___________________________

NAME:________________________              NAME:________________________

TITLE:_______________________              TITLE:_______________________

Witness:_____________________              Witness:_____________________

Date: _______________________              Date: _______________________

                                       5<PAGE>

                                                                   Exhibit 10.17

                                                                  Execution Copy
                      FIRST AMENDMENT TO CREDIT AGREEMENT
                          [Revolving Credit Facility]

     THIS FIRST AMENDMENT TO CREDIT AGREEMENT (this "Amendment") dated as of the
26th day of February, 2001, by and among PLAINS MARKETING, L.P. ("Borrower"),
ALL AMERICAN PIPELINE, L.P. ("All American") and PLAINS ALL AMERICAN PIPELINE,
L.P. ("Plains MLP"), as guarantors, FLEET NATIONAL BANK, as Administrative Agent
(in such capacity, "Administrative Agent"), and the Lenders party hereto.

                              W I T N E S S E T H:

     WHEREAS, Borrower, All American, Plains MLP, Administrative Agent and
Lenders entered into that certain Credit Agreement [Revolving Credit Facility]
dated as of May 8, 2000 (as amended, restated, or supplemented to the date
hereof, the "Original Agreement") for the purposes and consideration therein
expressed, pursuant to which Lenders became obligated to make and made loans to
Borrower as therein provided; and

     WHEREAS, Borrower, All American, Plains MLP, Administrative Agent, and
Lenders desire to amend the Original Agreement for the purposes described
herein;

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
and agreements contained herein and in the Original Agreement, in consideration
of the loans which may hereafter be made by Lenders to Borrower, and for other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto do hereby agree as follows:

                    ARTICLE I. -- Definitions and References

     (S) 1.1.  Terms Defined in the Original Agreement.  Unless the context
otherwise requires or unless otherwise expressly defined herein, the terms
defined in the Original Agreement shall have the same meanings whenever used in
this Amendment.

     (S) 1.2.  Other Defined Terms.  Unless the context otherwise requires, the
following terms when used in this Amendment shall have the meanings assigned to
them in this (S) 1.2.

          "Amendment" means this First Amendment to Credit Agreement.

          "Amendment Documents" means this Amendment, the Renewal Notes, and the
     Amendments to Security Documents as described in Section 3.1(c) hereof.

          "Credit Agreement" means the Original Agreement as amended hereby.

          "Original Notes" means the "Notes" referred to and defined as such in
     the Original Agreement.

                                                       Revolving Credit Facility

                                       1
<PAGE>

          "Renewal Notes" means the renewal promissory notes of Borrower in the
     form attached hereto as Exhibit A, expressly renewing, extending and
     increasing the Original Notes.

                           ARTICLE II. -- Amendments

     (S) 2.1.  Definitions.  (a)  Applicable Leverage Level.  The table set
forth in the definition of "Applicable Leverage Level" set forth in Section 1.1
of the Original Agreement is hereby amended in its entirety to read as follows:

        Applicable
      Leverage Level                Leverage Ratio
     -----------------   ------------------------------------
     Level I             greater than or equal to 4.50 to 1.0

     Level II            greater than or equal to 4.25 to 1.0
                              but less than 4.50 to 1.0

     Level III           greater than or equal to 4.00 to 1.0
                              but less than 4.25 to 1.0

     Level IV            greater than or equal to 3.50 to 1.0
                              but less than 4.00 to 1.0

     Level V             greater than or equal to 3.00 to 1.0
                              but less than 3.50 to 1.0

     Level VI            greater than or equal to 2.25 to 1.0
                              but less than 3.00 to 1.0

     Level VII           greater than or equal to 1.75 to 1.0
                              but less than 2.25 to 1.0

     Level VIII                 less than 1.75 to 1.0

     (b) Base Rate Margin:  The table set forth in the definition of "Base
Rate Margin" set forth in Section 1.1 of the Original Agreement is hereby
amended in its entirety to read as follows:

                                                       Revolving Credit Facility

                                       2
<PAGE>

 Applicable Leverage Level     Base Rate Margin
-----------------------------------------------
Level I                                   1.500%
-----------------------------------------------
Level II                                  1.250%
-----------------------------------------------
Level III                                 1.125%
-----------------------------------------------
Level IV                                  1.000%
-----------------------------------------------
Level V                                   0.500%
-----------------------------------------------
Level VI                                  0.250%
-----------------------------------------------
Level VII or Level VIII                   0.000%
-----------------------------------------------

     (c) Commitment.  The definition of "Commitment" set forth in Section 1.1 of
the Original Agreement is hereby amended in its entirety to read as follows:

          "Commitment" means, subject to the last sentence of Section 2.1,
     $471,666,666.67.  Each Lender's Commitment shall be the amount initially
     set forth on the Lender Schedule, as such Lender's Commitment may be
     reduced or increased from time to time pursuant to assignments by or to
     such Lender pursuant to Section 10.5(c), or increased from time to time
     pursuant to the last sentence of Section 2.1.

     (d) Commitment Fee Rate.  The table set forth in the definition of
"Commitment Fee Rate" set forth in Section 1.1 of the Original Agreement is
hereby amended in its entirety to read as follows:

     Applicable Leverage Level        Commitment Fee Rate
---------------------------------------------------------
Level I or Level II or Level III                    0.500%
 or Level IV or Level V
---------------------------------------------------------
Level VI or Level VII                               0.375%
---------------------------------------------------------
Level VIII                                          0.250%
---------------------------------------------------------

     (e) Consolidated EBITDA.  Clause (5) of the definition of "Consolidated
EBITDA" set forth in Section 1.1 of the Original Agreement is hereby renumbered
clause (6), and a new clause (5) is hereby added immediately before "minus"
preceding such clause (6), to read as follows:

     plus (5) settlement payments made in such period with respect to litigation
     arising out of the unauthorized trading activity by Borrower during the
     period of January 1, 1999 to November 20, 1999, not to exceed an aggregate
     amount of $6,963,000

                                                       Revolving Credit Facility

                                       3
<PAGE>

     (f) Consolidated Funded Indebtedness.  The proviso at the end of the last
sentence of the definition of "Consolidated Funded Indebtedness" set forth in
Section 1.1 of the Original Agreement is hereby amended in its entirety to read
as follows:

     provided, however, that Consolidated Funded Indebtedness shall not include
     Indebtedness in respect of letters of credit, Cash and Carry Purchases, or
     margin deposits.

     (g) Letter of Credit Fee Rate.  The table set forth in the definition of
"Letter of Credit Fee Rate" set forth in Section 1.1 of the Original Agreement
is hereby amended in its entirety to read as follows:

 Applicable Leverage Level     LC Fee Rate
------------------------------------------
Level I                              3.000%
------------------------------------------
Level II                             2.750%
------------------------------------------
Level III                            2.625%
------------------------------------------
Level IV                             2.500%
------------------------------------------
Level V                              2.000%
------------------------------------------
Level VI                             1.750%
------------------------------------------
Level VII                            1.500%
------------------------------------------
Level VIII                           1.250%
------------------------------------------

     (h) LIBOR Rate Margin.  The table set forth in the definition of "LIBOR
Rate Margin" set forth in Section 1.1 of the Original Agreement is hereby
amended in its entirety to read as follows:

                                                       Revolving Credit Facility

                                       4
<PAGE>

Applicable Leverage Level      LIBOR Rate Margin
------------------------------------------------
Level I                                    3.000%
------------------------------------------------
Level II                                   2.750%
------------------------------------------------
Level III                                  2.625%
------------------------------------------------
Level IV                                   2.500%
------------------------------------------------
Level V                                    2.000%
------------------------------------------------
Level VI                                   1.750%
------------------------------------------------
Level VII                                  1.500%
------------------------------------------------
Level VIII                                 1.250%
------------------------------------------------

     (i) Maturity Date.  The reference to "April 30, 2004" set forth in the
definition of "Maturity Date" set forth in Section 1.1 of the Original Agreement
is hereby amended to refer instead to "April 30, 2005".

     (j) Permitted Investments.  Clause (c) of the definition of "Permitted
Investments" set forth in Section 1.1 of the Original Agreement is hereby
amended in its entirety to read as follows:

     (c) Investments by Plains MLP or any of its Subsidiaries in:

          (I) any Wholly Owned Subsidiary of Plains MLP which is a Guarantor,
     other than any Canadian Subsidiary or

          (II) any Canadian Subsidiary, provided that (A) Borrower shall notify
     Administrative Agent and each Lender in the event the aggregate amount of
     such Investments in Canadian Subsidiaries shall exceed $100,000 and (B) the
     aggregate amount of such Investments in Canadian Subsidiaries shall not
     exceed (x) $100,000 in the aggregate prior to the earlier of the CanPet
     Acquisition Closing Date and Murphy Acquisition Closing Date, (y)
     $27,000,000 (exclusive of any Investment described in clause (z) below)
     with respect to the CanPet Acquisition, the proceeds of which shall be used
     to consummate the CanPet Acquisition, to fund contango transactions and for
     working capital purposes with respect to the CanPet Acquisition, and (z)
     $57,000,000 (exclusive of any Investment described in clause (y) above)
     with respect to the Murphy Acquisition, the proceeds of which shall be used
     to consummate the Murphy Acquisition, to fund contango transactions and for
     working capital purposes with respect to the Murphy Acquisition.

     The reference to "$5,000,000" set forth in clause (d) of such definition is
hereby amended to refer instead to "the Dollar Equivalent of $5,000,000".

                                                       Revolving Credit Facility

                                       5
<PAGE>

     (k) Canadian Dollars, Canadian Subsidiaries and CanPet Acquisition.  The
following definitions of "Canadian Dollars", "Canadian Subsidiaries", "CanPet
Acquisition", "Canpet Acquisition Documents" and "Canpet Closing Date" are
hereby added to Section 1.1 of the Original Agreement immediately following the
definition of "Business Day", to read as follows:

          "Canadian Dollars" and "C$" means the lawful currency of Canada.

          "Canadian Subsidiaries" means each of PMC (Nova Scotia) Company, a
     Nova Scotia unlimited liability company, Plains Marketing Canada, L.P., an
     Alberta limited partnership, and each of their Subsidiaries, whether now
     owned or hereafter acquired.

          "CanPet Acquisition" means the acquisition by Borrower and Plains
     Marketing Canada, L.P. of all or substantially all of the assets of CanPet
     Energy Group (USA), Inc. and CanPet Energy Group Inc., respectively,
     pursuant to the CanPet Acquisition Documents.

          "CanPet Acquisition Documents" means the purchase and sale agreement,
     title transfer documents and all other agreements or instruments executed
     and delivered by Borrower, Plains Marketing Canada, L.P. or any Affiliate
     in connection therewith to consummate the CanPet Acquisition.

          "CanPet Acquisition Closing Date" means the date on which the CanPet
     Acquisition shall have been consummated and Borrower and Plains Marketing
     Canada, L.P. shall have taken good and defensible title to the assets
     subject thereof.

     (l) Dollars and Dollar Equivalent.  The following definitions of "Dollars"
and "Dollar Equivalent" are hereby added to Section 1.1 of the Original
Agreement immediately following the definition of "Disclosure Schedule", to read
as follows:

          "Dollars" and "$" means U.S. dollars except where otherwise specified.

          "Dollar Equivalent" of any amount of any currency at any date means
     (i) if such currency is Dollars, the amount of such currency, or (ii) if
     such currency is Canadian Dollars, the equivalent in Dollars of such amount
     of such currency based upon the rate of exchange for such conversion as
     quoted by the Bank of Canada at approximately 12:00 noon, Toronto time (or,
     if not so quoted, the spot rate of exchange quoted for wholesale
     transactions made by Administrative Agent) on the date on or as of which
     such amount is to be determined.

     (m) Murphy Acquisition.  The following definitions of "Murphy Acquisition",
"Murphy Acquisition Documents" and "Murphy Acquisition Closing Date" are hereby
added to Section 1.1 of the Original Agreement immediately following the
definition of "Moody's", to read as follows:

                                                       Revolving Credit Facility

                                       6
<PAGE>

          "Murphy Acquisition" means the acquisition by Plains Marketing Canada,
     L.P. of certain assets from Murphy Oil Company Ltd. as previously disclosed
     by Borrower to Administrative Agent and Lenders pursuant to the Murphy
     Acquisition Documents.

          "Murphy Acquisition Documents" means the purchase and sale agreement,
     title transfer documents and all other agreements or instruments executed
     and delivered by Plains Marketing Canada, L.P. or any Affiliate in
     connection therewith to consummate the Murphy Acquisition.

          "Murphy Acquisition Closing Date" means the date on which the Murphy
     Acquisition shall have been consummated and Plains Marketing Canada, L.P.
     shall have taken good and defensible title to the assets subject thereof.

     (S) 2.2.  Amendment of Marketing Credit Agreement.  The second sentence of
Section 1.3 of the Original Agreement is hereby amended by adding the following
phrase at the end thereof:

     , as amended by the First Amendment to Credit Agreement [Letter of Credit
     and Hedged Inventory Facility] dated as of February 26, 2001 and as amended
     and restated as contemplated by and provided for in such First Amendment.

     (S) 2.2A.  Maximum Commitment.  Section 2.1 of the Original Agreement is
hereby amended by adding the following sentence at the end thereof:

     Borrower shall have the right, without the consent of the Lenders but with
     the prior approval of the Administrative Agent, not to be unreasonably
     withheld, to cause from time to time an increase in the Commitment by
     adding to this Agreement one or more additional Lenders or by allowing one
     or more Lenders to increase their respective Commitments; provided however
     (i) no Event of Default shall have occurred hereunder which is continuing,
     (ii) no such increase shall result in the aggregate Commitment hereunder to
     exceed $500,000,000, (iii) no Lender's Commitment shall be increased
     without such Lender's consent, and (iv) on the effective date of any such
     increase, there shall be no outstanding LIBOR Loans hereunder.

     (S) 2.3.  Notices and Environmental Matters.  The references to
"$1,000,000" set forth in Section 6.4(e), 6.12(b) and 6.12(c) of the Original
Agreement are hereby amended to refer instead to "the Dollar Equivalent of
$1,000,000".

     (S) 2.4.  Indebtedness under Marketing Credit Agreement and Issuance of
Additional Indebtedness.  The reference to "$350,000,000" set forth in Section
7.1(e) of the Original Agreement is hereby amended to refer instead to
"$300,000,000".

     Clause (g) of Section 7.1 of the Original Agreement is hereby redesignated
clause (h), and a new clause (g) is hereby added immediately before such clause
(h), to read as follows:

                                                       Revolving Credit Facility

                                       7
<PAGE>

          (g) Indebtedness owing by Plains MLP or any other Restricted Person
     under its senior unsecured privately placed or public term Indebtedness
     (and any Indebtedness issued in exchange therefor), provided (1) such
     Indebtedness shall not permit optional redemption by the issuer or
     mandatory redemption by any holder thereof solely at the option of any such
     holder, nor any stated maturity, in each case prior to the Maturity Date,
     (2) the indenture governing such Indebtedness shall have no covenants or
     other requirements more onerous than the Loan Documents, (3) the aggregate
     outstanding face amount of such Indebtedness shall not exceed $400,000,000,
     (4) all of the net proceeds of such originally issued Indebtedness shall be
     used to repay Loans to Borrower, (5) upon the receipt of net proceeds from
     the original issuance of such Indebtedness, the Commitment shall be
     permanently reduced by an amount equal to (A) forty percent (40%) of the
     face amount of such Indebtedness, if the aggregate face amount is less than
     $350,000,000, or (B) fifty percent (50%) of the face amount of such
     Indebtedness, if the aggregate face amount of such bonds is equal to or
     greater than $350,000,000, and (6) both immediately prior to and
     immediately following the consummation of such offering, no Default or
     Event of Default shall have occurred and be continuing.

     The reference to "$25,000,000" set forth in Section 7.1(g) of the Original
Agreement (to be redesignated as clause (h) as set forth in the prior paragraph
hereof) is hereby amended to refer instead to "the Dollar Equivalent of
$25,000,000".

     (S) 2.5.  Limitation on Sales of Property.  The reference to "$10,000,000"
set forth in Section 7.5(c) of the Original Agreement is hereby amended to refer
instead to "the Dollar Equivalent of $10,000,000".

     (S) 2.6.  Debt Coverage Ratio.  Section 7.12 of the Original Agreement is
hereby amended in its entirety to read as follows:

          Section 7.12.  Debt Coverage Ratio.  (a) At the end of any Fiscal
     Quarter, (b) on any date on which General Partner declares a distribution
     permitted under Section 7.6 and (c) on the date of any Permitted
     Acquisition, both immediately prior to and after giving effect to the
     consummation thereof, the Debt Coverage Ratio will not be greater than:

               (i) prior to both the CanPet Acquisition Closing Date and Murphy
          Acquisition Closing Date: (A) 4.0 to 1.0, in the case of any
          determination during the period from the date hereof through and
          including March 31, 2002, and (B) 3.75 to 1.0, in the case of any
          determination thereafter;

               (ii) on and after the CanPet Acquisition Closing Date, and prior
          to the Murphy Acquisition Closing Date (if the CanPet Acquisition
          Closing Date shall occur prior to the Murphy Acquisition Closing
          Date): (I) 4.25 to 1.0, in the case of any determination during the
          period from the date hereof through and including December 30, 2002,
          and (II) 4.00 to 1.0, in the case of any determination thereafter; and

                                                       Revolving Credit Facility

                                       8
<PAGE>

               (iii) on and after the Murphy Acquisition Closing Date (whether
     or not the CanPet Acquisition Closing Date has occurred): (A) 4.75 to 1.0,
     in the case of any determination during the period from the date hereof
     through and including September 29, 2001, (B) 4.50 to 1.0, in the case of
     any determination during the period from September 30, 2001 through and
     including June 29, 2002, (C) 4.25 to 1.0, in the case of any determination
     from June 30, 2002 through and including December 30, 2002, and (D) 4.00 to
     1.0, in the case of any determination thereafter.

     As used herein, "Debt Coverage Ratio" means the ratio of (a) Consolidated
     Funded Indebtedness to (b) Consolidated EBITDA for the four Fiscal Quarter
     period (or other period specified below) most recently ended prior to the
     date of determination for which financial statements contemplated by
     Section 6.2(a) or (b) are available to Borrower; provided, for purposes of
     this Section 7.12, if, since the beginning of the four Fiscal Quarter
     period ending on the date for which Consolidated EBITDA is determined, any
     Restricted Person shall have made any asset disposition or acquisition,
     shall have consolidated or merged with or into any Person (other than
     another Restricted Person), or shall have made any disposition or
     acquisition of a Restricted Person, Consolidated EBITDA shall be calculated
     giving pro forma effect thereto as if the disposition, acquisition,
     consolidation or merger had occurred on the first day of such period. Such
     pro forma effect shall be determined (i) in good faith by the chief
     financial officer of Borrower, and (ii) without giving effect to any
     anticipated or proposed change in operations, revenues, expenses or other
     items included in the computation of Consolidated EBITDA, except with the
     consent of Majority Lenders.

     (S) 2.7.  Debt to Capital Ratio.  Section 7.14 of the Original Agreement is
hereby amended in its entirety to read as follows:

          Section 7.14  Debt to Capital Ratio.  The ratio of (a) all
     Consolidated Funded Indebtedness to (b) the sum of Consolidated Funded
     Indebtedness plus Consolidated Net Worth will never be greater than:

               (i) prior to both the CanPet Acquisition Closing Date and the
          Murphy Acquisition Closing Date: 0.65 to 1.0 at any time;

               (ii) on and after the CanPet Acquisition Closing Date, and prior
          to the Murphy Acquisition Closing Date (if the CanPet Acquisition
          Closing Date shall occur prior to the Murphy Acquisition Closing
          Date): 0.67 to 1.0 at any time prior to December 30, 2002, and 0.65 to
          1.0 thereafter; and

               (iii) on and after the Murphy Acquisition Closing Date (whether
          or not the CanPet Acquisition Closing Date has occurred): 0.73 to 1.0
          at any time prior to December 30, 2002, and 0.65 to 1.0 thereafter.

                                                       Revolving Credit Facility

                                       9
<PAGE>

     (S) 2.8.  Events of Default.  The references to "$2,500,000" set forth in
Section 8.1(g), 8.1(i)(iv), 8.1(i)(v) and 8.1(i)(vi) of the Original Agreement
are hereby amended to refer instead to "the Dollar Equivalent of $2,500,000".

     (S) 2.9.  Lender Schedules.  Each Lender's Initial Commitment and
Percentage Share set forth on its Lender Schedule attached as Schedule 1 to the
Original Agreement is hereby amended to refer instead to such Lender's Initial
Commitment and Percentage Share as set forth opposite its signature block
hereon.  Schedule 1 to the Original Agreement is further hereby amended by
adding new Lender Schedules to read as set forth on the Lender Schedules
attached hereto.  The Composite Lender Schedule set forth on the last page of
the Lender Schedule attached as Schedule 1 to the Original Agreement is hereby
amended in its entirety to read as set forth on the Composite Lender Schedule
attached hereto.

     (S) 2.10. Schedules and Exhibits.  Schedule 3 and Exhibit A attached to the
Original Agreement are hereby amended in their respective entirety to read as
set forth on Schedule 3 and Exhibit A attached hereto.

     (S) 2.11. Consent to Transfers and Issuances of Limited Partner Interests
in Plains Marketing Canada, L.P.  As of the date hereof, Plains Marketing Canada
LLC, a Delaware limited liability company, owns all of the outstanding limited
partner interests in Plains Marketing Canada, L.P., an Alberta limited
partnership.  Lenders hereby consent to the transfer by Plains Marketing Canada
LLC, a Delaware limited liability company, of any or all such outstanding
limited partner interests in Plains Marketing Canada, L.P. to Borrower, and
waive any Default or Event of Default under Section 7.4(b) or Section 7.7 of the
Credit Agreement caused thereby.

     As of the date hereof, all of the outstanding limited partner interests in
Plains Marketing Canada, L.P., an Alberta limited partnership, are owned,
directly or indirectly, by Borrower. Lenders hereby consent to the issuance by
Plains Marketing Canada, L.P., an Alberta limited partnership, of limited
partner interests to CanPet Energy Group (USA), Inc. or CanPet Energy Group Inc.
to effect the consummation of the CanPet Acquisition as set forth in the CanPet
Acquisition Documents, and waive any Default or Event of Default under Section
7.4 or Section 7.6 of the Credit Agreement caused thereby, provided, such
limited partner interests shall:

          (i) pay no cash dividend nor entitle the holder thereof to any cash
     distribution, except upon dissolution (provided that the foregoing shall
     not prevent the accrual of any such dividends or distributions);

          (ii) not entitle the holder thereof to any right to manage or control
     Plains Marketing Canada, L.P. or vote with respect thereto; and

          (iii)  not be redeemable or exchangeable by the holder thereof for
     cash or callable or subject to a put option for cash at the option of any
     such holder.

                                                       Revolving Credit Facility

                                       10
<PAGE>

     In the event any limited partner interests issued by Plains Marketing
Canada, L.P., an Alberta limited partnership, to CanPet Energy Group (USA), Inc.
or CanPet Energy Group Inc. are exchanged for units issued by Plains MLP,
Lenders hereby consent to the contribution by Plains MLP to Borrower of any and
all such partnership interests, and waive any Default or Event of Default under
Section 7.4(c) or Section 7.5 of the Credit Agreement caused thereby.

     (S) 2.12. Consent to CanPet Acquisition.  Lenders hereby consent to the
CanPet Acquisition (as defined in the Credit Agreement as amended hereby),
subject to the following:

          (a) Administrative Agent shall have received and approved copies of
     all environmental evaluations, reports or reviews related to properties to
     be acquired pursuant to the CanPet Acquisition, and there shall be no
     existing or potential environmental liabilities disclosed thereunder or
     otherwise existing except as disclosed by Borrower to Administrative Agent
     and Lenders prior to the date hereof.

          (b) Administrative Agent and each Lender shall have received any
     updated or revised business and/or financial projections with respect to
     the assets and operations to be acquired pursuant to the CanPet
     Acquisition, and no such projection shall materially and adversely differ
     from those projections previously delivered to Administrative Agent and
     Lenders.

          (c) The CanPet Acquisition shall exclude the acquisition of any
     existing or potential environmental or litigation liabilities incurred
     prior to the CanPet Acquisition Closing Date, except as disclosed by
     Borrower to Administrative Agent and Lenders prior to the date hereof, and
     Borrower and Plains Marketing Canada, L.P., as acquirers, shall have
     received an environmental indemnity providing for a deductible of not more
     than C$50,000 in the aggregate (not applicable with respect to
     environmental liabilities disclosed to Administrative Agent and Lenders
     prior to the date hereof) and a cap of not less than C$3,000,000 in the
     aggregate, to be effective for not less than two years with respect to on-
     site contamination and three years with respect to off-site contamination
     following the CanPet Acquisition Closing Date, and otherwise reasonably
     satisfactory to Administrative Agent with respect to such liabilities.

          (d) Administrative Agent  shall have received and approved copies of
     all CanPet Acquisition Documents and all other related documents as
     Administrative Agent may request.

          (e) The cash portion of the purchase price shall not exceed
     $26,000,000.

          (f) Both immediately prior to and immediately following the
     consummation of the CanPet Acquisition, no Material Adverse Change shall
     have occurred since December 31, 1999, and no Default or Event of Default
     shall have occurred and be continuing.

                                                       Revolving Credit Facility

                                       11
<PAGE>

          (g) Canadian Subsidiaries shall have delivered Security Documents
     pursuant to Section 6.14 of the Credit Agreement with respect to the
     properties acquired pursuant to the CanPet Acquisition, the definition of
     "Marketing Credit Priority Collateral" set forth in the Intercreditor
     Agreement dated May 8, 2000 among the Administrative Agent, Lenders and the
     administrative agent and lenders under the Marketing Credit Agreement shall
     be amended to include properties of the type described therein owned by
     Canadian Subsidiaries as well as Borrower, and pursuant thereto such Liens
     on such Canadian Subsidiaries' property securing the Obligations shall be
     subordinated to the Liens on such Canadian Subsidiaries' property securing
     the Indebtedness under the Marketing Credit Agreement.

     (S) 2.13. Consent to Murphy Acquisition.  Lenders hereby consent to the
Murphy Acquisition, subject to the following:

          (a) Administrative Agent shall have received and approved copies of
     all environmental evaluations, reports or reviews related to properties to
     be acquired pursuant to the Murphy Acquisition, and there shall be no
     existing or potential environmental liabilities disclosed thereunder or
     otherwise existing except as disclosed by Borrower to Administrative Agent
     and Lenders prior to the date hereof.

          (b) Administrative Agent and each Lender shall have received any
     updated or revised business and/or financial projections with respect to
     the assets and operations to be acquired pursuant to the Murphy
     Acquisition, and no such projection shall materially and adversely differ
     from those projections previously delivered to Administrative Agent and
     Lenders.

          (c) The Murphy Acquisition shall exclude the acquisition of any
     existing or potential environmental or litigation liabilities incurred
     prior to the Murphy Acquisition Closing Date, except as disclosed by
     Borrower to Administrative Agent and Lenders prior to the date hereof, and
     Plains Marketing Canada, L.P., as acquirer, shall have received an
     environmental indemnity with respect to all environmental liabilities
     disclosed to Administrative Agent and Lenders prior to the date hereof and
     further providing for a deductible of not more than $300,000 in the
     aggregate, with a $20,000 deductible per site thereafter, and a cap of not
     less than $3,000,000 in the aggregate, with respect to all other
     environmental liabilities, and otherwise reasonably satisfactory to
     Administrative Agent with respect to such liabilities.

          (d) Administrative Agent  shall have received and approved copies of
     all Murphy Acquisition Documents and all other related documents as
     Administrative Agent may request.

          (e) The cash portion of the purchase price shall not exceed
     $155,000,000 (subject to upward adjustment for net working capital
     adjustments not to exceed $6,000,000 in the aggregate).

                                                       Revolving Credit Facility

                                       12
<PAGE>

          (f) Both immediately prior to and immediately following the
     consummation of the Murphy Acquisition, no Material Adverse Change shall
     have occurred since December 31, 1999, and no Default or Event of Default
     shall have occurred and be continuing.

          (g) On the Murphy Acquisition Closing Date: (1) Canadian Subsidiaries
     shall on the Murphy Acquisition Closing Date deliver Security Documents
     pursuant to Section 6.14 of the Credit Agreement (together with opinions of
     legal counsel for Canadian Subsidiaries and related corporate documents and
     records; documents evidencing governmental authorizations, consents,
     approvals, licenses and exemptions; and certificates of public officials
     and of officers and representatives of Restricted Persons as Administrative
     Agent may request) with respect to all of their properties, and (2) the
     Intercreditor Agreement dated May 8, 2000 among the Administrative Agent,
     Lenders and the administrative agent and lenders under the Marketing Credit
     Agreement shall be amended and restated to, among other things, amend the
     definition of "Marketing Credit Priority Collateral" to include properties
     of the type described therein owned by Canadian Subsidiaries as well as
     Borrower, and pursuant thereto such Liens on such Canadian Subsidiaries'
     property securing the Obligations shall be subordinated to the Liens on
     such Canadian Subsidiaries' property securing the Indebtedness under the
     Marketing Credit Agreement.

     (S) 2.14. Consent to Restated Agreement.  Lenders hereby consent to (a) the
addition to the Credit Agreement of a $100,000,000 term loan facility to PMC
(Nova Scotia) Company, a Nova Scotia unlimited liability company and a Canadian
Subsidiary, and $30,000,000 Canadian working capital revolving credit facility
to PMC (Nova Scotia) Company, a Nova Scotia unlimited liability company, or
Plains Marketing Canada, L.P., an Alberta limited partnership, or both of them
if applicable, to be funded in connection with the consummation of the Murphy
Acquisition, pursuant to the terms and conditions set forth on the indicative
term sheet attached hereto as Annex I, and to permit the extensions of credit
from time to time outstanding thereunder and the accrued interest and fees in
respect thereof to share ratably in the benefits of this Agreement and the other
Loan Documents with the Loans and LC Obligations and the accrued interest and
fees in respect thereof and pari passu with respect to all Collateral
thereunder, subject only to the Intercreditor Agreement described in Section
2.12, and (b) the inclusion of the outstanding commitments of all lenders under
the Credit Agreement, whether Lenders, term lenders or Canadian working capital
revolver lenders, whether drawn or undrawn, in any determination of Majority
Lenders (other than with respect to extensions of maturity or reductions in
amortization of a facility, which shall include only the commitments of lenders
under such facility with respect to determinations thereof).

     In furtherance of the foregoing, each Lender hereby acknowledges and agrees
that it shall, subject to reasonable documentation review and approval of
Majority Lenders, execute and deliver (a) an amended and restated credit
agreement, adding such facilities to the Credit Agreement, and (b) an amended
and restated intercreditor agreement among all lenders under the facilities
under the Credit Agreement, as so amended and restated, and under the Marketing
Credit Agreement, providing for, among other things (i) such ratable sharing and
voting among

                                                       Revolving Credit Facility

                                       13
<PAGE>

all lenders under the facilities under the Credit Agreement as so amended and
restated as set forth above and (ii) an amendment to the definition of
"Marketing Credit Priority Collateral" in the existing Intercreditor Agreement
to include properties of the type described therein owned by Canadian
Subsidiaries as well as Borrower, and pursuant thereto Liens on all other
property securing the Indebtedness under the Marketing Credit Agreement shall be
subordinated to the Liens on such property securing the Obligations, and Liens
on such "Marketing Credit Priority Collateral" securing the Obligations shall be
subordinated to the Liens on such "Marketing Credit Priority Collateral"
securing the Indebtedness under the Marketing Credit Agreement. In consideration
of each Lender's execution and delivery of this Agreement and such Lender's
agreement to execute and deliver such amended and restated credit agreement and
intercreditor agreement, Borrower hereby agrees to pay to Administrative Agent
for the account of each Lender the amendment fees and/or work fees set forth in
that certain letter of even date herewith between Borrower and Administrative
Agent, on behalf of Lenders.

                  ARTICLE III. -- Conditions of Effectiveness

     (S) 3.1.  Effective Date.  This Amendment shall become effective as of the
date first above written when, and only when:

     (a) Administrative Agent shall have received, at Administrative Agent's
office, a counterpart of this Amendment executed and delivered by Borrower and
Majority Lenders (and with respect to Section 2.1(i), all Lenders), and
consented to by each Guarantor;

     (b) Borrower shall have issued and delivered to Administrative Agent, for
subsequent delivery to each Lender, a Renewal Note with appropriate insertions
payable to the order of such Lender, duly executed on behalf of Borrower, dated
the date hereof,

     (c) Restricted Persons shall have executed and delivered to Administrative
Agent Amendments to Security Documents amending the description of the secured
indebtedness therein to reflect the issuance of the Renewal Notes;

     (d) Administrative Agent shall have received an amendment fee paid by
Borrower for the account of each Lender equal to 0.15% of the amount such
Lender's revised Commitment set forth opposite its signature block hereto
exceeds such Lender's Commitment immediately prior to the effectiveness hereof,
and all other fees required to be paid to Administrative Agent or any Lender
pursuant to any Loan Documents, including fees and expenses of Thompson & Knight
LLP, counsel to Administrative Agent; and

     (e) Administrative Agent shall have additionally received all of the
following documents, each document (unless otherwise indicated) being dated the
date of receipt thereof by Administrative Agent, duly authorized, executed and
delivered, and in form and substance satisfactory to Administrative Agent:

          (i) Marketing Credit Amendment.  A contemporaneous amendment to the
     Marketing Credit Agreement, decreasing the Maximum Facility Amount to

                                                       Revolving Credit Facility

                                       14
<PAGE>

     $200,000,000, consenting to the CanPet Acquisition and the Murphy
     Acquisition on the same terms and conditions set forth herein, amending
     certain financial covenants on the same terms and conditions set forth
     herein, and amending various other provisions therein consistent with the
     amendments set forth herein;

          (ii) Opinions of Counsel for Restricted Persons.  The written opinions
     of Fulbright & Jaworski, L.L.P., special Texas and New York counsel to
     Restricted Persons, and an opinion of Tim Moore, General Counsel for
     Restricted Persons, addressed to Administrative Agent and Lenders, to the
     effect that this Amendment, each Renewal Note and the other Amendment
     Documents have been duly authorized, executed and delivered by Restricted
     Persons, to the extent a party thereto, and that the Credit Agreement, each
     Renewal Note and the other Amendment Documents constitute the legal, valid
     and binding obligations of Restricted Persons, to the extent a party
     thereto, enforceable in accordance with their respective terms (subject, as
     to enforcement of remedies, to applicable bankruptcy, reorganization,
     insolvency and similar laws and to moratorium laws and other laws affecting
     creditors' rights generally from time to time in effect).

          (iii)  Officer's Certificate.  A certificate of a duly authorized
     officer of General Partner stating that all of the representations and
     warranties set forth in Article IV hereof are true and correct at and as of
     the time of such effectiveness.

          (iv)  Supporting Documents.  (I) A Certificate of the Secretary of
     General Partner dated the date of this Amendment certifying that attached
     thereto is a true and complete copy of resolutions adopted by the Board of
     Directors of General Partner authorizing the execution, delivery and
     performance of this Amendment, each Renewal Note and the other Amendment
     Documents by Restricted Persons and certifying the names and true
     signatures of the officers of General Partner authorized to sign this
     Amendment, each Renewal Note and the other Amendment Documents on behalf of
     Restricted Persons, and (II) such supporting documents as Administrative
     Agent may request.

                 ARTICLE IV. -- Representations and Warranties

     (S) 4.1.  Representations and Warranties of Plains MLP and Borrower.  In
order to induce Administrative Agent and Lenders to enter into this Amendment,
Plains MLP and Borrower represent and warrant to Administrative Agent and each
Lender that:

          (a) The representations and warranties contained in Article V of the
     Original Agreement are true and correct at and as of the time of the
     effectiveness hereof, except to the extent that such representation and
     warranty was made as of a specific date.

          (b) Each Restricted Person is duly authorized to execute and deliver
     this Amendment, each Renewal Note and each other Amendment Document, to the
     extent a party thereto, and Borrower is and will continue to be duly
     authorized to borrow and perform its obligations under the Credit
     Agreement.  Each Restricted Person has duly taken all action necessary to
     authorize the execution and delivery of this Amendment,

                                                       Revolving Credit Facility

                                       15
<PAGE>

     each Renewal Note and each other Amendment Document, to the extent a party
     thereto, and to authorize the performance of their respective obligations
     hereunder.

          (c) The execution and delivery by each Restricted Person of this
     Amendment, each Renewal note and each other Amendment Document, to the
     extent a party thereto, the performance by each Restricted Person of its
     respective obligations hereunder and thereunder, and the consummation of
     the transactions contemplated hereby and thereby, do not and will not
     conflict with any provision of any Law or of the organizational documents
     of any Restricted Person, or of any material agreement, judgment, license,
     order or permit applicable to or binding upon any Restricted Person, or
     result in the creation of any Lien upon any assets or properties of any
     Restricted Person, except in favor of Administrative Agent for the benefit
     of Lenders and other Permitted Liens. Except for those which have been duly
     obtained, no consent, approval, authorization or order of any Tribunal or
     third party is required in connection with the execution and delivery by
     any Restricted Person of this Amendment, any Renewal Note or any other
     Amendment Document, or to consummate the transactions contemplated hereby
     and thereby.

          (d) When duly executed and delivered, each of this Amendment, each
     Renewal Note, each other Amendment Document, and each of the Loan
     Documents, as amended hereby and thereby, will be a legal and binding
     instrument and agreement of each Restricted Person to the extent a party
     thereto, enforceable in accordance with its terms, (subject, as to
     enforcement of remedies, to applicable bankruptcy, insolvency and similar
     laws applicable to creditors' rights generally).

          (e) The business and financial projections with respect to the assets
     and operations to be acquired pursuant to the CanPet Acquistion and the
     Murphy Acquisition previously delivered to Administrative Agent and Lenders
     fairly present Restricted Persons' best projections with respect thereto,
     and are based on reasonable historical business assumptions with respect to
     such assets and operations as well as Restricted Persons' current business
     operations and financial performance.  No Material Adverse Change has
     occurred since December 31, 1999.

                          ARTICLE V. -- Miscellaneous

     (S) 5.1.  Ratification of Agreements.  The Original Agreement, as hereby
amended, is hereby ratified and confirmed in all respects.  The Loan Documents
(including but not limited to each Guaranty), as they may be amended or affected
by this Amendment or any other Amendment Document, are hereby ratified and
confirmed in all respects by each Restricted Person to the extent a party
thereto.  Any reference to the Credit Agreement in any Loan Document shall be
deemed to refer to this Amendment also.  Any reference to the Notes in any other
Loan Document shall be deemed to be a reference to the Renewal Notes issued and
delivered pursuant to this Amendment.   The execution, delivery and
effectiveness of this Amendment, the Renewal Notes and the other Amendment
Documents shall not, except as expressly provided herein, operate as a waiver of
any right, power or remedy of Administrative

                                                       Revolving Credit Facility

                                       16
<PAGE>

Agent or any Lender under the Credit Agreement or any other Loan Document nor
constitute a waiver of any provision of the Credit Agreement or any other Loan
Document.

     (S) 5.2.  Ratification of Security Documents.  Restricted Persons,
Administrative Agent, and Lenders each acknowledge and agree that any and all
indebtedness, liabilities or obligations arising under or in connection with the
LC Obligations, as amended hereby, or the Notes, as amended hereby, are
Obligations and are secured indebtedness under, are guarantied by, and are
secured by, each and every Security Document to which any Restricted Person is a
party.  Each Restricted Person hereby re-pledges, re-grants and re-assigns a
security interest in and lien on every asset of the such Restricted Person
described as Collateral in any Security Document and re-guarantees all
Obligations, as amended hereby.

     (S) 5.3.  Ratification of Intercreditor Agreement.  Each Lender hereby
acknowledges and confirms that all Obligations under the Credit Agreement, as
amended hereby, and the "Obligations" under the Marketing Credit Agreement, as
amended on the date hereof, shall be and shall remain subject to the terms and
entitled to the benefits of the Intercreditor Agreement.

     (S) 5.4.  Survival of Agreements.  All representations, warranties,
covenants and agreements of the Restricted Persons herein shall survive the
execution and delivery of this Amendment and the performance hereof, including
without limitation the making or granting of each Loan and the issuance and
delivery of the Renewal Notes, and shall further survive until all of the
Obligations are paid in full.  All statements and agreements contained in any
certificate or instrument delivered by any Restricted Person hereunder or under
the Credit Agreement to Administrative Agent or any Lender shall be deemed to
constitute representations and warranties by, or agreements and covenants of,
such Restricted Person under this Amendment and under the Credit Agreement.

     (S) 5.5.  Loan Documents.  This Amendment, each Renewal Note, and each
other Amendment Document is a Loan Document, and all provisions in the Credit
Agreement pertaining to Loan Documents apply hereto.

     (S) 5.6.  GOVERNING LAW.  THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED
IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK AND ANY APPLICABLE LAWS OF
THE UNITED STATES OF AMERICA IN ALL RESPECTS, INCLUDING CONSTRUCTION, VALIDITY
AND PERFORMANCE.

     (S) 5.7.  Counterparts.  This Amendment may be separately executed in
counterparts and by the different parties hereto in separate counterparts, each
of which when so executed shall be deemed to constitute one and the same
Amendment.

                                                       Revolving Credit Facility

                                       17
<PAGE>

     IN WITNESS WHEREOF, this Amendment is executed as of the date first above
written.

                              PLAINS MARKETING, L.P.

                              By:   PLAINS ALL AMERICAN INC.,
                                    its general partner

                                    By:   /s/ Phil Kramer
                                       ------------------
                                       Phil Kramer
                                       Executive Vice President

                              PLAINS ALL AMERICAN PIPELINE, L.P.

                              By:   PLAINS ALL AMERICAN INC.,
                                    its general partner

                                    By:   /s/ Phil Kramer
                                       ------------------
                                       Phil Kramer
                                       Executive Vice President

                              ALL AMERICAN PIPELINE, L.P.

                              By:   PLAINS ALL AMERICAN INC.,
                                    its general partner

                                    By:   /s/ Phil Kramer
                                       ------------------
                                       Phil Kramer
                                       Executive Vice President

                                                       Revolving Credit Facility

                                       18
<PAGE>

Lender's Initial Commitment: $71,904,761,91   FLEET NATIONAL BANK,
Percentage Share:            15.244826%       as Administrative Agent and
Lender

                                              By:   /s/   Terrence Ronan
                                                  -----------------------
                                                  Terrence Ronan,
                                                  Managing Director

Lender's Initial Commitment: $61,666,666.67   FIRST UNION NATIONAL BANK, Lender
Percentage Share:            13.074205%
                                              By:  /s/
                                                  -------------------------
                                                  Name:
                                                  Title:

Lender's Initial Commitment: $61,666,666.67   BANK OF AMERICA, N.A., Lender
Percentage Share:            13.074205%
                                              By:  /s/
                                                  -------------------------
                                                  Name:
                                                  Title:

Lender's Initial Commitment: $46,666,666.67   BANK ONE, NA (MAIN OFFICE
Percentage Share:            9.893993%        CHICAGO), successor by merger to
                                              Bank One Texas, N.A.,  Lender

                                              By:  /s/
                                                  -------------------------
                                                  Name:
                                                  Title:

                                              By:  /s/
                                                  -------------------------
                                                  Name:
                                                  Title:

Lender's Initial Commitment: $51,666,666.67   FORTIS CAPITAL CORP., Lender
Percentage Share:            10.954064%
                                              By:  /s/
                                                  -------------------------
                                                  Name:
                                                  Title:

                                                       Revolving Credit Facility

                                       19
<PAGE>

Lender's Initial Commitment: $21,333,333.33   U.S. BANK NATIONAL ASSOCIATION,
Percentage Share:            4.522968%        Lender

                                              By:  /s/
                                                  -------------------------
                                                  Name:
                                                  Title:

Lender's Initial Commitment: $24,976,190.47   BANK OF SCOTLAND, Lender
Percentage Share:            5.295305%
                                              By:  /s/
                                                  -------------------------
                                                  Name:
                                                  Title:

Lender's Initial Commitment: $21,333,333.33   WELLS FARGO BANK (TEXAS),
Percentage Share:            4.522968%        NATIONAL ASSOCIATION, Lender

                                              By:  /s/
                                                  -------------------------
                                                  Name:
                                                  Title:

Lender's Initial Commitment: $25,000,000      THE BANK OF NOVA SCOTIA, Lender
Percentage Share:            5.300353%
                                              By:  /s/
                                                  -------------------------
                                                  Name:
                                                  Title:

Lender's Initial Commitment: $17,833,333.33   CREDIT AGRICOLE INDOSUEZ, Lender
Percentage Share:            3.780919%
                                              By:  /s/
                                                  -------------------------
                                                  Name:
                                                  Title:

                                                       Revolving Credit Facility

                                       20
<PAGE>

Lender's Initial Commitment: $6,666,666.67    GUARANTY FEDERAL BANK, F.S.B.,
Percentage Share:            1.413428%        Lender

                                              By:  /s/
                                                  --------------------------
                                                  Name:
                                                  Title:

Lender's Initial Commitment: $21,428,571.43   TORONTO DOMINION (TEXAS), INC.,
Percentage Share:            4.543160%        Lender

                                              By:  /s/
                                                  --------------------------
                                                  Name:
                                                  Title:

Lender's Initial Commitment: $10,714,285.71   SOUTHWEST BANK OF TEXAS, N.A.,
Percentage Share:            2.271580%        Lender

                                              By:  /s/
                                                  --------------------------
                                                  Name:
                                                  Title:

Lender's Initial Commitment: $21,666,666.67   UNION BANK OF CALIFORNIA, Lender
Percentage Share:            4.593640%
                                              By:  /s/
                                                  --------------------------
                                                  Name:
                                                  Title:

Lender's Initial Commitment: $7,142,857.14    COMERICA BANK-TEXAS, Lender
Percentage Share:            1.514387%
                                              By:   /s/
                                                  --------------------------
                                                  Name:
                                                  Title:

                                                       Revolving Credit Facility

                                       21
<PAGE>

                             CONSENT AND AGREEMENT

     Each of the undersigned Guarantors hereby consents to the provisions of
this Amendment and the execution and delivery of the Renewal Notes and the other
Amendment Documents, and the transactions contemplated herein and therein and
hereby and thereby (i) acknowledges and agrees that any and all indebtedness,
liabilities or obligations arising under or in connection with the Renewal Notes
are Obligations and are secured indebtedness under, and are secured by, each and
every Security Document to which it is a party, (ii) re-pledges, re-grants and
re-assigns a security interest in and lien on all of its assets described as
collateral in any Security Document, (iii) ratifies and confirms its Guaranty
made by it for the benefit of Administrative Agent and Lenders, and (iv)
expressly acknowledges and agrees that such Guarantor guarantees all
indebtedness, liabilities and obligations arising under or in connection with
the Renewal Notes pursuant to the terms of such Guaranty, and agrees that its
obligations and covenants thereunder are unimpaired hereby and shall remain in
full force and effect.

                         PLAINS MARKETING CANADA LLC

                         By:  Plains Marketing, L.P., its sole member

                              By:   Plains All American Inc.,
                                    its general partner

                                    By:   /s/ Phil Kramer
                                       ---------------------------------
                                       Phil Kramer, Exec. Vice President

                         PMC (NOVA SCOTIA) COMPANY

                         By:   /s/ Phil Kramer
                            ---------------------------------
                            Phil Kramer, Exec. Vice President

                         PLAINS MARKETING CANADA, L.P.

                         By:  PMC (Nova Scotia) Company,
                              its general partner

                              By:   /s/ Phil Kramer
                                 ---------------------------------
                                 Phil Kramer, Exec. Vice President

                                                       Revolving Credit Facility

                                       22

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