FIRST AMENDMENT TO
                     AMENDED AND RESTATED CREDIT AGREEMENT

                                     Among


                          TESORO PETROLEUM CORPORATION
                                 as the Company


                                      and


                                 BANQUE PARIBAS
         Individually, as an Issuing Bank and as Administrative Agent,


                            THE BANK OF NOVA SCOTIA
                    Individually and as Documentation Agent


                                      and


                           THE FINANCIAL INSTITUTIONS
                        NOW OR HEREAFTER PARTIES HERETO



                         Effective as of March 21, 1997


                               TABLE OF CONTENTS

                                                             Page

ARTICLE I.  DEFINITIONS
    Section 1.01   Terms Defined Above . . . . . . . . . . . . .1
    Section 1.02   Terms Defined in Credit Agreement . . . . . .1
    Section 1.03   Other Definitional Provisions . . . . . . . .1

ARTICLE II.  AMENDMENTS TO CREDIT AGREEMENT
    Section 2.01   Amendments and Supplements to Definitions . .2
    Section 2.02   Amendments to Article VI. . . . . . . . . . .2

ARTICLE III.  CONDITIONS
    Section 3.01   Loan Documents. . . . . . . . . . . . . . . .2
    Section 3.02   Corporate Proceedings of Loan Parties . . . .2
    Section 3.03   Representations and Warranties. . . . . . . .3
    Section 3.04   No Default. . . . . . . . . . . . . . . . . .3
    Section 3.05   Security Instruments. . . . . . . . . . . . .3
    Section 3.06   Other Instruments or Documents. . . . . . . .3

ARTICLE IV.  MISCELLANEOUS
    Section 4.01   Adoption, Ratification and Confirmation of
                     Credit Agreement. . . . . . . . . . . . . .3
    Section 4.02   Ratification and Affirmation of Guaranty. . .3
    Section 4.03   Successors and Assigns. . . . . . . . . . . .4
    Section 4.04   Counterparts. . . . . . . . . . . . . . . . .4
    Section 4.05   Number and Gender . . . . . . . . . . . . . .4
    Section 4.06   Entire Agreement. . . . . . . . . . . . . . .4
    Section 4.07   Invalidity. . . . . . . . . . . . . . . . . .4
    Section 4.08   Titles of Articles, Sections and Subsections.4
    Section 4.09   Governing Law . . . . . . . . . . . . . . . .5

                                      -i-


                       FIRST AMENDMENT AND SUPPLEMENT TO
                                CREDIT AGREEMENT


    This  FIRST  AMENDMENT  AND  SUPPLEMENT  TO  CREDIT  AGREEMENT  (this "First
Amendment") executed effective as of March 21, 1997 (the "Effective  Date"),  is
by   and  among  TESORO  PETROLEUM  CORPORATION,  a  Delaware  corporation  (the
"Company");  BANQUE  PARIBAS,   individually,   as   an   Issuing  Bank  and  as
Administrative Agent, THE BANK OF NOVA SCOTIA, individually and as Documentation
Agent, and each of the lenders that is a signatory hereto  or  which  becomes  a
party  hereto  as  provided  in  Section  9.07  (individually,  a  "Lender" and,
collectively, the "Lenders").

                              W I T N E S S E T H:

    WHEREAS, the Company, the Administrative Agent, the Documentation Agent, the
Issuing Bank and the Lenders  are  parties  to that certain Amended and Restated
Credit Agreement dated as of June 7, 1996 (the "Credit Agreement"), pursuant  to
which  the  Lenders  agreed to make loans and issue Letters of Credit to and for
the account of the Company; and

    WHEREAS,  the  Company,  the   Guarantors,  the  Administrative  Agent,  the
Documentation Agent, and the Lenders desire to amend the Credit Agreement in the
particulars hereinafter provided;

    NOW, THEREFORE, in consideration of the premises and  the  mutual  covenants
herein contained, the parties hereto agree as follows:


                            ARTICLE I.  DEFINITIONS

    Section  1.01   Terms  Defined Above.  As used in this First Amendment, each
of the terms "Company", "Credit Agreement", "Effective Date", "First Amendment",
and "Lenders" shall have the meaning assigned to such term hereinabove.

    Section 1.02   Terms Defined in Credit  Agreement.  Each term defined in the
Credit Agreement and used herein  without  definition  shall  have  the  meaning
assigned  to such term in the Credit Agreement, unless expressly provided to the
contrary.

    Section 1.03   Other Definitional Provisions.

         (a)  The words  "hereby",  "herein",  "hereinafter",  "hereof",
    "hereto"  and  "hereunder"  when  used in this First Amendment shall
    refer to this First Amendment as  a  whole and not to any particular
    Article, Section, subsection or provision of this First Amendment.

         (b)  Section, subsection and Exhibit references herein  are  to
    such  Sections,  subsections  and  Exhibits  to this First Amendment
    unless otherwise specified.


                  ARTICLE II.  AMENDMENTS TO CREDIT AGREEMENT

    The  Company, the Administrative Agent, the Documentation Agent, the Issuing
Bank and  the  Lenders  agree  that  the  Credit  Agreement  is  hereby amended,
effective as of the Effective Date, in the following particulars.

    Section 2.01   Amendments and Supplements to Definitions.

         (a)  The definition  of  "Agreement"  in  Section  1.01  of the
    Credit Agreement is hereby amended to mean the Credit Agreement,  as
    amended  by  this  First  Amendment and as the same may from time to
    time be further amended, supplemented or modified.

         (b)  Section 1.01 of  the  Credit  Agreement  is hereby further
    amended and supplemented by  adding  the  following  new  definition
    where  alphabetically  appropriate,  which read in their entirety as
    follows:

              "First Amendment" shall mean  that certain First Amendment
         to Amended and Restated Credit Agreement dated as of March  21,
         1997,  by  and among the Company, the Administrative Agent, the
         Documentation Agent, the Issuing Bank and the Lenders.

    Section 2.02   Amendments to  Article  VI.   Section  6.09(e)  of the Credit
Agreement is hereby amended in its entirety to read as follows:

         "(e)  routine  loans  or  advances  to  employees  made in the ordinary
    course of business not to exceed  (A) $1,500,000 at any one time outstanding
    to any one employee and (B) $5,000,000 in the aggregate;"


                            ARTICLE III.  CONDITIONS

    The enforceability of this First Amendment against the Administrative Agent,
the Documentation Agent, the Issuing Bank and the  Lenders  is  subject  to  the
satisfaction of the following conditions precedent:

    Section 3.01   Loan Documents.  The Administrative Agent shall have received
multiple  original  counterparts,  as  requested by the Administrative Agent, of
this First Amendment executed and delivered  by a duly authorized officer of the
Company, each of the Guarantors, the  Administrative  Agent,  the  Documentation
Agent, each Issuing Bank and each Lender, as applicable;

    Section 3.02   Corporate Proceedings  of  Loan  Parties.  The Administrative
Agent shall have received multiple copies, as requested  by  the  Administrative
Agent,  of the resolutions, in form and substance reasonably satisfactory to the
Administrative Agent, of the Boards of Directors of the

                                      -2-

Company and the Guarantors, authorizing  the execution, delivery and performance
of  this  First  Amendment,  each  such  copy  being  attached  to  an  original
certificate of the Secretary or an Assistant Secretary of  the  Company  or  the
Guarantors,  as  applicable, dated as of the Effective Date, certifying (i) that
the resolutions  attached  thereto  are  true,  correct  and  complete copies of
resolutions duly adopted by written consents or at meetings  of  the  Boards  of
Directors,  (ii)  that  such resolutions constitute all resolutions adopted with
respect to the  transactions  contemplated  hereby,  (iii) that such resolutions
have not been amended, modified, revoked or rescinded as of the Effective  Date,
(iv) that the respective articles of incorporation and bylaws of the Company and
the  Guarantors  have not been amended or otherwise modified since the effective
date of  the  Credit  Agreement,  except  pursuant  to  any  amendments attached
thereto, and (v) as to the incumbency and  signature  of  the  officers  of  the
Company or the Guarantors, as applicable, executing this First Amendment.

    Section  3.03   Representations  and  Warranties.  Except as affected by the
transactions contemplated in the Credit Agreement and this First Amendment, each
of the representations and warranties made  by the Company and the Guarantors in
or pursuant to the Financing Documents, including the Credit Agreement, shall be
true and correct in all material respects as of the Effective Date, as  if  made
on and as of such date.

    Section  3.04   No  Default.   No  Default  or  Event  of Default shall have
occurred and be continuing as of the Effective Date.

    Section  3.05   Security  Instruments.   All  of  the  Security  Instruments
(subject to any partial releases thereof) shall  be in full force and effect and
provide to the Administrative Agent the security intended thereby to secure  the
Indebtedness.

    Section  3.06   Other Instruments or Documents.  The Administrative Agent or
any Lender or  counsel  to  the  Administrative  Agent  shall receive such other
instruments or documents as they may reasonably request.


                           ARTICLE IV.  MISCELLANEOUS

    Section 4.01   Adoption, Ratification and Confirmation of Credit  Agreement.
Each of the Company, the Guarantors, the Administrative Agent, the Documentation
Agent,  the  Issuing  Bank and the Lenders does hereby adopt, ratify and confirm
the Credit Agreement, as amended  hereby,  and  acknowledges and agrees that the
Credit Agreement, as amended hereby, is and remains in full force and effect.

    Section 4.02   Ratification  and  Affirmation  of  Guaranty.   Each  of  the
Guarantors  hereby expressly (i) acknowledges the terms of this First Amendment,
(ii) ratifies and affirms its obligations  under the Second Amended and Restated
Guaranty Agreement dated as of January 28, 1997, in favor of the  Administrative
Agent,  the  Documentation  Agent, the Issuing Bank and the Lenders, as amended,
supplemented or otherwise  modified  ("Guaranty Agreement"), (iii) acknowledges,
renews and extends its continued liability  under  the  Guaranty  Agreement  and
agrees that such Guaranty

                                      -3-
<PAGE
Agreement  remains  in  full  force  and  effect;  and  (iv)  guarantees  to the
Administrative Agent, the Documentation Agent, each Issuing Bank and each Lender
to promptly pay when due  all  amounts  owing  or  to  be  owing by it under the
Guaranty Agreement pursuant to the terms and conditions thereof.

    Section 4.03   Successors  and  Assigns.   This  First  Amendment  shall  be
binding upon and inure to the benefit of the parties hereto and their respective
successors and assigns permitted pursuant to the Credit Agreement.

    Section 4.04   Counterparts.  This First Amendment may be executed by one or
more  of  the  parties hereto in any number of separate counterparts, and all of
such counterparts taken together shall be  deemed to constitute one and the same
instrument and shall be enforceable as of the Effective Date upon the  execution
of  one  or  more  counterparts  hereof  by  the  Company,  the  Guarantors, the
Administrative Agent, the Documentation Agent, the Issuing Bank and the Lenders.
In this regard, each of  the  parties  hereto acknowledges that a counterpart of
this First Amendment containing a set of counterpart execution pages  reflecting
the  execution of each party hereto shall be sufficient to reflect the execution
of this First Amendment by each  necessary party hereto and shall constitute one
instrument.

    Section 4.05   Number and Gender.  Whenever the context requires,  reference
herein  made to the single number shall be understood to include the plural; and
likewise, the  plural  shall  be  understood  to  include  the  singular.  Words
denoting sex shall be construed to include the masculine, feminine  and  neuter,
when  such  construction  is  appropriate;  and  specific  enumeration shall not
exclude the general but shall be  construed as cumulative.  Definitions of terms
defined in the singular or plural shall be equally applicable to the  plural  or
singular, as the case may be, unless otherwise indicated.

    Section  4.06   Entire  Agreement.   This  First  Amendment  constitutes the
entire agreement among the parties  hereto  with  respect to the subject hereof.
All prior understandings, statements and agreements, whether  written  or  oral,
relating to the subject hereof are superseded by this First Amendment.

    Section  4.07   Invalidity.   In  the  event  that  any  one  or more of the
provisions contained in  this  First  Amendment  shall  for  any  reason be held
invalid, illegal or unenforceable in any respect, such invalidity, illegality or
unenforceability shall not affect any other provision of this First Amendment.

    Section 4.08   Titles of Articles, Sections and Subsections.  All titles  or
headings  to  Articles,  Sections,  subsections or other divisions of this First
Amendment or the exhibits hereto, if  any,  are  only for the convenience of the
parties and shall not be construed to have any effect or meaning with respect to
the other content of such Articles, Sections, subsections,  other  divisions  or
exhibits,  such  other  content  being  controlling  as  the agreement among the
parties hereto.

                                      -4-

    Section 4.09   Governing  Law.  This  First  Amendment  and  the  rights and
obligations of the parties hereunder and under the  Credit  Agreement  shall  be
governed  by and construed in accordance with the laws of the State of Texas and
the United States of America.

      THIS  FIRST  AMENDMENT,  THE  CREDIT  AGREEMENT,  AS  AMENDED  AND
      SUPPLEMENTED HEREBY, THE NOTES,  AND THE OTHER FINANCING DOCUMENTS
      CONSTITUTE A  WRITTEN  LOAN  AGREEMENT  AND  REPRESENT  THE  FINAL
      AGREEMENT  BETWEEN  THE  PARTIES  AND  MAY  NOT BE CONTRADICTED BY
      EVIDENCE OF PRIOR, CONTEMPORANEOUS,  OR SUBSEQUENT ORAL AGREEMENTS
      OF THE PARTIES.

      THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.



                      [SIGNATURES BEGIN NEXT PAGE]

                                  -5-

    IN WITNESS WHEREOF, the parties hereto have caused this First  Amendment  to
be  duly  executed and delivered by their proper and duly authorized officers as
of the Effective Date.

COMPANY:                     TESORO PETROLEUM CORPORATION


                             By:   /s/ G. A. Wright
                             Name:     G. A. Wright
                             Title:    Vice President and Treasurer


ADMINISTRATIVE AGENT,
ISSUING BANK AND LENDER:     BANQUE PARIBAS, individually, as an Issuing
                             Bank and as Administrative Agent


                             By:   /s/ B. Malone
                             Name:     Brian Malone
                             Title:    Vice President


                             By:   /s/ Barton D. Schouest
                             Name:     Barton D. Schouest
                             Title:    Group Vice President


DOCUMENTATION AGENT,
ISSUING BANK AND LENDER:          THE BANK OF NOVA SCOTIA


                             By:   /s/ F.C.H. Ashby
                             Name:     F.C.H. Ashby
                             Title:    Senior Manager
                                       Loan Operations

LENDERS:                     BANK OF SCOTLAND


                             By:   /s/ Annie Chin Tat
                             Name:     Annie Chin Tat
                             Title:    Assistant Vice President

                                      S-1



                             CHRISTIANIA BANK OG KREDITKASSE


                             By:   /s/ Williams S. Phillips
                             Name:     Williams S. Phillips
                             Title:    Vice President


                             By:   /s/ Peter M. Dodge
                             Name:     Peter M. Dodge
                             Title:    First Vice President


                             THE FIRST NATIONAL BANK OF CHICAGO,
                             Individually and as an Issuing Bank


                             By:   /s/ George R. Schanz
                             Name:     George R. Schanz
                             Title:    Vice President


                             FIRST UNION NATIONAL BANK OF NORTH
                             CAROLINA


                             By:   /s/ Michael J. Kolosowsky
                             Name:     Michael J. Kolosowsky
                             Title:    Vice President


                             NATIONAL BANK OF CANADA


                             By:   /s/ Larry L. Sears
                             Name:     Larry L. Sears
                             Title:    Group Vice President


                             By:   /s/ Doug G. Clark
                             Name:     Doug G. Clark
                             Title:    Vice President

                                      S-2


                             THE FROST NATIONAL BANK


                             By:   /s/ Jennifer A. Crabtree
                             Name:     Jennifer A. Crabtree
                             Title:    Associate Relationship Manager


                             DEN NORSKE BANK ASA


                             By:   /s/ Morten Bjornsen
                             Name:     Morten Bjornsen
                             Title:    Senior Vice President


                             By:   /s/ J. Morten Kreutz
                             Name:     J. Morten Kreutz
                             Title:    Vice President


GUARANTORS:                  TESORO ALASKA PETROLEUM COMPANY
                             TESORO EXPLORATION AND PRODUCTION
                             COMPANY
                             TESORO PETROLEUM COMPANIES, INC.
                             DIGICOMP, INC.
                             TESORO TECHNOLOGY PARTNERS COMPANY
                             INTERIOR FUELS COMPANY
                             TESORO ALASKA PIPELINE COMPANY
                             TESORO NORTHSTORE COMPANY
                             TESORO REFINING, MARKETING & SUPPLY
                             COMPANY
                             TESORO NATURAL GAS COMPANY
                             TESORO BOLIVIA PETROLEUM COMPANY
                             TESORO VOSTOK COMPANY
                             KENAI PIPE LINE COMPANY
                             TESORO MARINE SERVICES COMPANY
                             TESORO COASTWIDE SERVICES COMPANY
                             COASTWIDE MARINE SERVICES, INC.


                             By:   /s/ G. A. Wright
                             Name:     G. A. Wright
                             Title:    Vice President and Treasurer

                                      S-3


                             TESORO GAS RESOURCES COMPANY, INC.
                             TESORO FINANCIAL SERVICES HOLDING COMPANY


                             By:   /s/ J. B. Fabian
                             Name:     J. B. Fabian
                             Title:    President


                             VICTORY FINANCE COMPANY


                             By:   /s/ David W. Dupert
                             Name:     David W. Dupert
                             Title:    President

                                      S-4


                             TESORO E&P COMPANY, L.P.

                             By:  TESORO EXPLORATION AND PRODUCTION
                                  COMPANY, as its general partner


                             By:   /s/ G. A. Wright
                                       G. A. Wright
                                       Vice President and Treasurer

                                      S-5