Document:

<PAGE>
                                                                   EXHIBIT 10.25

             TENTH AMENDMENT TO AMENDED AND RESTATED LOAN AGREEMENT
                         DATED AS OF SEPTEMBER 30, 1996

         THIS TENTH AMENDMENT TO AMENDED AND RESTATED LOAN AGREEMENT (the "Tenth
Amendment") effective as of the 19th day of February, 2002, by and among MAXCO,
INC., a Michigan Corporation ("Borrower") and COMERICA BANK, a Michigan banking
corporation ("Bank").

                                   WITNESSETH

         WHEREAS, Borrower and Bank entered into a certain Amended and Restated
Loan Agreement dated September 30, 1996, as amended by First Amendment thereto
dated as of August 1, 1997, as further amended by Second Amendment thereto dated
as of June 24, 1998, as further amended by Third Amendment thereto dated as of
September 24, 1998, as further amended by Fourth Amendment thereto dated as of
June 22, 1999, as further amended by Fifth Amendment thereto dated as of
September 1, 1999, as further amended by Sixth Amendment thereto dated as of
July 12, 2000, as further amended by Seventh Amendment dated as of January 11,
2001, as further amended by Eighth Amendment dated as of March 19, 2001; and as
further amended by Ninth Amendment dated as of October 1, 2001 (the
"Agreement"); and

         WHEREAS, Borrower and Bank now desire to amend the Agreement for the
purpose of modifying certain financial and other covenants.

         NOW, THEREFORE, in consideration of the premises and the mutual
covenants herein contained, the Borrower and the Bank hereby agree as follows:

         1. In Sub-Section 1.1 of Section 1 of the Agreement, the following
definitions are hereby deleted in their entirety and replaced by the following:

           "Advance Formula Agreement" shall mean that certain Advance
         Formula Agreement of even date herewith between Borrower and the Bank.

           "Collateral Documents" shall mean the Security Agreements, the
         Pledge Agreements, the Mortgages, the Grants of Security Interests, and
         the Financing Statements.

         2. In Sub-section 1.1 of Section 1, the following definitions are
added:

                   "Grants of Security Interests" shall mean grants of security
         interests in Investment Property of Borrower or a Guarantor, including
         but not limited to membership interests in limited liability companies
         or partnership interests in partnership entities, in such form as shall
         be required by the Bank pursuant to this Agreement, which the Borrower
         and the Guarantors have previously granted or in the future will grant,
         to the Bank, as to any Investment Property.

                                      -1-

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                  "Investment Property" shall have the meaning ascribed to that
         term in the Uniform Commercial Code (MCLA 440.1101, et seq.), in effect
         in the State of Michigan, as the same may be amended from time to time.

         3. Sub-Section 7.7 of Section 7 is hereby deleted in its entirety and
is replaced by the following:

            7.7 Guarantee Obligations. Guarantee or otherwise, directly or
         indirectly, in any way be or become responsible for obligations of any
         other Person, whether by agreement to purchase the indebtedness of any
         other Person, agreement for the furnishing of funds to any other Person
         through the furnishing of goods, supplies or services, by way of stock
         purchase, capital contribution, advance or loan, for the purpose of
         paying or discharging (or causing the payment or discharge of) the
         indebtedness of any other Person, or otherwise, except for (i) the
         endorsement of negotiable instruments by the Borrower or the
         Subsidiaries in the ordinary course of business for deposit or
         collection, (ii) the guaranty by the Borrower of any and all
         obligations of any Subsidiary wholly-owned by Borrower, (iii) the
         guaranties by the Borrower listed on Schedule 5.12 of this Agreement;
         provided that the aggregate dollar amount of all guarantees expressly
         permitted by (ii) and (iii) of this Sub-Section 7.7 shall not, at any
         time, exceed $60 Million; provided further that notwithstanding the
         foregoing, the aggregate dollar amount of all guarantees expressly
         permitted by (ii) and (iii) of this Sub-Section 7.7. shall not exceed
         $45 Million at any time beginning April 1, 2002 and thereafter.

         4. Reference is made to Paragraph 19 of the Ninth Amendment to the
Amended and Restated Loan Agreement dated as of October 1, 2001 ("Paragraph
19"), which Paragraph 19 is hereby deleted in its entirety and replaced by the
following:

            Notwithstanding any provision contained in the Agreement, as
         amended, to the contrary, it is specifically agreed that, in addition
         to the other obligations of Borrower under the Agreement and the Notes,
         Borrower shall undertake and complete the timely sale of those assets,
         interests and investments listed upon the attached Schedule of Asset
         Sales/Cash Generation Efforts ("Schedule of Sales"), in accordance with
         the sale parameters (including range of sale price, approximate dates
         of sales and percentage of proceeds to be paid to the Bank) set forth
         in the Schedule of Sales, all of which are by this reference
         incorporated herein. The Schedule of Sales may be modified only by
         written agreement of the Bank, which agreement to modify may be
         withheld in the Bank's sole discretion.

         5. Except as otherwise provided by this Tenth Amendment, neither the
extension of this Tenth Amendment by the Bank, nor any other act or omission by
the Bank in connection herewith, shall be deemed an express or implied waiver by
the Bank of any default under the Agreement.

                      [SIGNATURES APPEAR ON FOLLOWING PAGE]

                                      -2-

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         The Borrower and the Bank have caused this Tenth Amendment to be
executed by their duly authorized officers as of the day and year first written
above.

                                        MAXCO, INC.

                                        By:   /S/ Vincent Shunsky
                                              ----------------------------------
                                              Vincent Shunsky
                                              Its: Vice President

                                        COMERICA BANK

                                        By:   /S/ David G. Grantham
                                              ----------------------------------
                                        Its:  Vice President
                                              ----------------------------------

         The Undersigned Guarantors hereby acknowledge and consent to the above
Tenth Amendment.

Ersco Corporation                       Pak-Sak Industries, Inc.

By:   /S/ Vincent Shunsky               By:   /S/ Vincent Shunsky
      --------------------------              ----------------------------------
      Vincent Shunsky                         Vincent Shunsky
      Its: Treasurer                          Its: Treasurer

                                      -3-

<PAGE>
                                   Schedule of
                       Asset Sales/Cash Generation Efforts

<TABLE>
<CAPTION>
TRANSACTION
-----------                                                        Range                    Likely       CMA            CMA
                                                          from                 to            Date      % Share (1)      $$
                                                      -------------     -------------   ------------  ---------    -------------
<S>                                                    <C>               <C>              <C>             <C>       <C>
Sale of equity interest in L/M Associates II, and all  $ 6,650,000   -   $13,300,000 *    June  '02       100%      $ 6,650,000 est.
related real estate joint venture entities

Provant, Inc. earn-out                                   2,750,000   -     2,750,000        May '02       100%        2,750,000 est.

Wright Plastics, Inc. Note repayment                       675,000   -       675,000       Aug. '02       100%          675,000 est.
              (one-half of $1.3M note)

Pak-Sak, Inc. sale of the business                       2,000,000   -     3,000,000       June '02       100%        2,500,000 est.
                                                       -----------       -----------                                -----------

                                           Totals:     $12,075,000   -   $19,725,000                                $12,575,000
                                                       ===========       ===========                                ===========
</TABLE>

         *        Amounts yet to be quantified; Maxco's revised equity interest
                  yet to be quantified; the final amount will be determined
                  based on final disposition of Partner's/Owner's mutually
                  agreed upon equity calculation and the Buyer's due diligence
                  resulting in a final mutually agreed upon sale/purchase price

         (1)      100%  of asset/investments sales proceeds to be paid to
                  Comerica and applied first to the Maxco inventory over-formula
                  facility and, second, to the Maxco term debt, until such time
                  as the term debt and over-formula facility are paid in full;
                  thereafter, Maxco may retain all net asset/investments sale
                  proceeds

                                      -4-<PAGE>

                                                                    EXHIBIT 4.10

                             SUPPLEMENTAL INDENTURE

                               ESCROW CORP. MERGER

         SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"), dated as of May
17, 2002 among Tesoro Escrow Corp. (the "Company"), Tesoro Petroleum Corporation
("Tesoro"), the subsidiary guarantors listed on the signature page hereto (the
"Original Guarantors") and U.S. Bank National Association, as trustee under the
indenture referred to below (the "Trustee"). Capitalized terms used herein and
not defined herein shall have the meaning ascribed to them in the Indenture (as
defined below).

                                   WITNESSETH

         WHEREAS, the Company has executed and delivered to the Trustee an
indenture (as amended and in effect, the "Indenture"), dated as of April 9,
2002, providing for the initial original issuance of an aggregate principal
amount of $450,000,000 of 9 5/8% Senior Subordinated Notes due 2012 (the
"Notes");

         WHEREAS, Section 5.01 of the Indenture provides that, upon any merger
of the Company with and into another corporation, the Person surviving such
merger (if other than the Company) shall assume all of the obligations and
covenants of the Company under the Notes and the Indenture pursuant to a
supplemental indenture;

         WHEREAS, Section 5.02 of the Indenture provides that, upon any merger
of the Company in accordance with Section 5.01 of the Indenture, the successor
corporation into which the Company is merged shall succeed to, and be
substituted for and may exercise every right and power of, the Company under the
Indenture with the same effect as if such successor Person had been a party to
the Indenture;

         WHEREAS, Tesoro intends to merge the Company with and into Tesoro
immediately prior to the acquisition of the Golden Eagle Assets (the "Escrow
Corp. Merger") and pursuant to this Supplemental Indenture Tesoro, as the
surviving corporation, intends to assume all of the obligations and covenants of
the Company under the Notes and the Indenture and succeed to and be substituted
for the Company under the Indenture;

         WHEREAS, Article XI of the Indenture provides that upon the
consummation of the Escrow Corp. Merger and Tesoro's assumption of the
obligations and covenants of the Company under the Notes and the Indenture, the
Original Guarantors shall execute and deliver to the Trustee this Supplemental
Indenture pursuant to which such Subsidiaries shall unconditionally guarantee
all of Tesoro's Obligations (as successor to the Company) under the Notes
pursuant to a Subsidiary Guarantee on the terms and conditions set forth herein;
and

         WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is
authorized to execute and deliver this Supplemental Indenture.

         NOW THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt of which is hereby acknowledged, the
Company, Tesoro, the Original

                                      -1-
<PAGE>

Guarantors and the Trustee mutually covenant and agree for the equal and ratable
benefit of the Holders of the Notes as follows:

         1. Effect. This Supplemental Indenture shall become effective upon
filing of the certificate of merger with the Secretary of State of Delaware to
effectuate the acquisition of the Golden Eagle Assets.

         2. Succession to Indenture. Tesoro hereby assumes all obligations and
covenants (including, without limitation, all the Obligations) of the Company
under the Indenture and the Notes, and pursuant to Section 5.02 of the
Indenture, Tesoro hereby succeeds to and is substituted for, and may exercise
every right and power of, the Company under the Indenture and the Notes, with
the same effect as if Tesoro has been a party to the Indenture. Tesoro agrees to
comply with all applicable terms of the Indenture and the Notes.

         3. Agreement to Guarantee. Each of the Original Guarantors hereby
agrees, jointly and severally with all other Original Guarantors, to guarantee
Tesoro's Obligations under the Notes and the Indenture on the terms and subject
to the conditions set forth in Article XI of the Indenture and to be bound by
all other applicable provisions of the Indenture as a Guarantor thereunder.

         4. No Recourse Against Others. No past, present or future director,
officer, employee, manager, incorporator, partner, member, agent, shareholder or
other owner of Capital Stock of the Company, Tesoro and any Guarantor, as such,
shall have any liability for any obligations of the Company, Tesoro or any
Guarantor under the Notes, any Subsidiary Guarantees, the Indenture or this
Supplemental Indenture or for any claim based on, in respect of, or by reason
of, such obligations or their creation. Each Holder by accepting a Note waives
and releases all such liability. The waiver and release are part of the
consideration for issuance of the Notes.

         5. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK
SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE.

         6. Counterparts. The parties may sign any number of copies of this
Supplemental Indenture. Each signed copy shall be an original, but all of them
together represent the same agreement.

         7. Effect of Headings. The Section headings herein are for convenience
only and shall not affect the construction hereof.

         8. The Trustee. The Trustee shall not be responsible in any manner
whatsoever for or in respect of the validity or sufficiency of this Supplemental
Indenture or for or in respect of the correctness of the recitals of fact
contained herein, all of which recitals are made solely by the Original
Guarantor.

                                       -2-
<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have caused this
Supplemental Indenture to be duly executed and attested, all as of the date
first above written.

                                     TESORO ESCROW CORP.

                                     By: /s/ GREGORY A. WRIGHT
                                         ---------------------------------------
                                         Name:  Gregory A. Wright
                                         Title: Senior Vice President and Chief
                                                Financial Officer

                                     TESORO PETROLEUM CORPORATION

                                     By: /s/ GREGORY A. WRIGHT
                                         ---------------------------------------
                                         Name:  Gregory A. Wright
                                         Title: Senior Vice President and Chief
                                                Financial Officer

                                     FAR EAST MARITIME COMPANY
                                     GOLD STAR MARITIME COMPANY
                                     TESORO FINANCIAL SERVICES HOLDING
                                     COMPANY
                                     VICTORY FINANCE COMPANY

                                     By: /s/ SHARON L. LAYMAN
                                         ---------------------------------------
                                         Name:  Sharon L. Layman
                                         Title: Authorized Person

                                     DIGICOMP INC.
                                     KENAI PIPE LINE COMPANY
                                     SMILEY'S SUPER SERVICE, INC.
                                     TESORO ALASKA COMPANY
                                     TESORO ALASKA PIPELINE COMPANY
                                     TESORO AVIATION COMPANY
                                     TESORO GAS RESOURCES COMPANY, INC.
                                     TESORO HAWAII CORPORATION
                                     TESORO HIGH PLAINS PIPELINE COMPANY
                                     TESORO MARINE SERVICES HOLDING COMPANY
                                     TESORO MARINE SERVICES, LLC
                                     TESORO MARITIME COMPANY

                                       -3-
<PAGE>

                                     TESORO NORTHSTORE COMPANY
                                     TESORO PETROLEUM COMPANIES, INC.
                                     TESORO REFINING AND MARKETING COMPANY
                                     TESORO TECHNOLOGY COMPANY
                                     TESORO TRADING COMPANY
                                     TESORO VOSTOK COMPANY

                                     By: /s/ SHARON L. LAYMAN
                                         ---------------------------------------
                                         Name:  Sharon L. Layman
                                         Title: Vice President and Treasurer

                                     U.S. BANK NATIONAL ASSOCIATION, as Trustee

                                     By: /s/ JAMES KOWALSKI
                                         ---------------------------------------
                                         Name:  James Kowalski
                                         Title: Assistant Vice President

                                      -4-

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