CLARK REFINING & MARKETING, INC.


                                AMENDMENT NO. 4
                              TO CREDIT AGREEMENT


           This AMENDMENT NO. 4 (the "Amendment") is dated as of October 2, 1998
 and entered into by and among Clark Refining & Marketing, Inc., a Delaware
 corporation (the "Company"), Bankers Trust Company, a New York Banking
 corporation, as Administrative Agent and Collateral Agent, The Toronto-Dominion
 Bank, a Canadian chartered bank, as Syndication Agent, and BankBoston, N.A., a
 national banking association, as Documentation Agent, and the other financial
 institutions party hereto (the "Banks").  This Amendment amends the Credit
 Agreement (as amended, amended and restated, supplemented or otherwise
 modified, the "Credit Agreement") dated as of September 25, 1997 by and among
 the parties hereto.  Capitalized terms used herein without definition shall
 have the same meanings herein as set forth in the Credit Agreement.

                                    RECITALS

           WHEREAS, the parties hereto entered into the Credit Agreement, which
 provides for a loan facility to the Company;

           WHEREAS, the parties hereto desire to make certain amendments to the
 Credit Agreement as set forth below.

           NOW, THEREFORE, in consideration of the premises and the agreements,
 provisions and covenants herein contained, the parties hereto agree as follows;


                                   Article I

                       AMENDMENTS TO THE CREDIT AGREEMENT

           1.01  Amendments to Section 1.01 of the Credit Agreement.

      (a) The definition of "Borrowing Base" shall be amended by deleting
 clauses (e) and (f) in their entirety and the following clauses (e) and (f)
 shall be inserted in lieu thereof:

           "(e) 80% of Eligible Petroleum Inventory,

           (f) 80% of Eligible Petroleum Inventory-Not-Received, and".

      (b) The definition of "Facility Expiry Date" shall be amended by deleting
 the date "December 31, 1999" and inserting the date "December 31, 2000" in lieu
 thereof.

      (c) The following definitions shall be inserted in Section 1.01 of the
 Credit Agreement:

 
           "Year 2000 Compliant" means, with respect to all Information Systems
           and Equipment, that all such systems and equipment accurately
           process, in all material respects date data (including, but not
           limited to, calculating, comparing and sequencing), before, during
           and after the year 2000, as well as same and multi-century dates, or
           between the years 1999 and 2000, taking into account all leap years,
           including the fact that the year 2000 is a leap year, and further,
           that when used in combination with, or interfacing with, other
           Information Systems and Equipment, shall accurately accept, release
           and exchange date data, and shall in all material respects continue
           to function in the same manner as it performs today and shall not
           otherwise impair the accuracy or functionality of Information Systems
           and Equipment.

           "Information Systems and Equipment" means all computer hardware,
           firmware and software, as well as other information processing
           systems, or any equipment containing embedded microchips, whether
           directly owned, licensed, leased, operated or otherwise controlled by
           the Company or any of its Subsidiaries, including through third-party
           service providers, and which, in whole or in part, are used,
           operated, relied upon, or integral to, the Company's or any of its
           Subsidiaries' conduct of their business.

           1.02  Amendment to Section 2.01 of the Credit Agreement.

      (a) Section 2.01. shall be amended by inserting the following sentence at
 the end of the first paragraph thereof:

                "Notwithstanding anything herein to the contrary, the maximum
      Effective Amount of loans permitted to be outstanding at any time
      hereunder may not be increased to an amount greater than $200,000,000
      without the written consent of all Banks and the Company, and acknowledged
      by the Administrative Agent."

           1.03  Amendment to Section 6.24 of the Credit Agreement.

      (a) Section 6.24 shall be amended by deleting it in its entirety and
  inserting the following in lieu thereof:

           6.24. Holdings Note Indenture, 9-1/2% Note Indenture and Floating
           and Fixed Rate Note Indentures and 1998 Floating and Fixed Rate Note
           Indentures.  The Indebtedness to be incurred by the Company under
           this Agreement is (i) "Permitted Indebtedness" under the Floating and
           Fixed Rate Note Indentures pursuant to the definition of such term
           contained therein and "Senior Debt"under the Floating and Fixed Rate
           Note Indenture described in clause (ii) of the definition of Floating
           and Fixed Rate Note Indentures pursuant to the definition of such
           term contained therein, (ii) "Permitted Indebtedness" under the 1998
           Floating and Fixed Rate Note Indentures pursuant to the definition of
           such term contained therein, and (iii) "Permitted Indebtedness" under
           the 9-1/2% Note Indenture pursuant to clause (ii) of the definition
           of such term contained in the 9-1/2% Note Indenture as this Agreement
           constitutes a refinancing, renewal, extension, refunding or
           replacement of the Existing Credit Agreement (which constitutes the
           "Credit Agreement" as defined in the 9-1/2% Note Indenture).  The
           Loan Documents, when executed and delivered by the parties thereto,
           are the "Credit Agreement" as such term is used in clause (b) of
           Section 1016 of the  9-1/2% Note Indenture.  The execution, delivery
           and performance of the Loan Documents and the provisions contained
           herein and therein do not contravene or conflict with,

                                      -2-

 
           result in a breach or violation of, or constitute a default under any
           of the terms, conditions or provisions of the Holdings Note
           Indenture, the Holdings Notes, the 9-1/2% Note Indenture, the 9-1/2%
           Notes, the Floating and Fixed Rate Note Indentures, the Floating and
           Fixed Rate Notes, the 1998 Floating and Fixed Rate Note Indentures or
           the 1998 Floating and Fixed Rate Notes.

           1.04  Amendment to Article VI of the Credit Agreement.  Article VI of
 the Credit Agreement shall be amended by inserting the following Section 6.26
 at the end thereof:

           6.26  Year 2000 Compliance.  All Information Systems and Equipment 
      are either Year 2000 Compliant, or any reprogramming, remediation, or any
      other corrective action, including the internal testing of all such
      Information Systems and Equipment, will be completed by September 30, 1999
      except where the failure to be so completed would not have a Material
      Adverse Effect. Further, to the extent that such reprogramming/remediation
      and testing action is required, the cost thereof, as well as the cost of
      the reasonably foreseeable consequences of failure to become Year 2000
      Compliant, to the Borrower and its Subsidiaries (including, without
      limitation, reprogramming errors and the failure of other systems or
      equipment) will not result in an Event of Default or a Material Adverse
      Effect.

           1.05  Amendment to Article VII of the Credit Agreement.  Article VII
 of the Credit Agreement shall be amended by inserting the following Section
 7.16 at the end thereof:

           7.16  Year 2000 Compliance.  The Company shall ensure that its
           Information Systems and Equipment are, at all times after January 1,
           1999, Year 2000 Compliant, except insofar as the failure to do so
           will not result in a Material Adverse Effect, and shall notify the
           Administrative Agent and the Banks promptly upon detecting any
           failure of the Information Systems and Equipment to be Year 2000
           Compliant if such failure would reasonably be expected to have a
           Material Adverse Effect.
 
           1.06  Amendments to Section 11.01 of the Credit Agreement.

      (a) Section 11.01 shall be amended by deleting clause (a) in its entirety
 and substituting "(a) intentionally omitted" in lieu thereof.

      (b) Section 11.01 shall be further amended by inserting, at the beginning
 of the second proviso thereto, the following clause (i) and by re-lettering
 clauses (i) through (iv) thereto accordingly:

           "(i) no amendment, waiver or consent shall increase or extend the
           Commitment of any Bank (or reinstate any Commitment terminated
           pursuant to Section 9.02(a)) unless such amendment, waiver or consent
           is in writing and signed by such Bank"
 
           1.07  Replacement of Schedule 1.01(a).  Schedule 1.01(a) attached
 hereto shall be attached to the Credit Agreement as Schedule 1.01(a)
 (Commitments) to the Credit Agreement and shall replace the existing Schedule
 1.01(a).

           1.08  Adjustments of Commitments.  Each Bank's participation in
 letters of credit under the Credit Agreement shall be automatically adjusted
 such that their participation shall be in accordance with their pro rata
 commitments as reflected on Schedule 1.01(a) (as amended hereby) to the Credit
 Agreement.

                                      -3-

 
                                   Article II

                          EFFECTIVENESS OF AMENDMENTS

           This Amendment shall become effective on the opening of business in
 New York on the Business Day (the "Effective Date") on which the Administrative
 Agent has notified the Company and the Banks that the Administrative Agent has
 executed a counterpart signature page of this Amendment, has received executed
 counterpart signature pages of this Amendment from the Company and the Majority
 Banks, and upon the satisfaction of the following conditions precedent and the
 prior receipt by the Administrative Agent of all of the following (and in the
 case of any agreements, documents, opinions and certificates, in sufficient
 copies for the Administrative Agent and each Bank) dated the Effective Date or
 such other date satisfactory to the Administrative Agent in form and substance
 satisfactory to the Administrative Agent:

      (a) Amendment and Notes.  This Amendment and Notes drawn to the order of
 each requesting Bank in an amount of such requesting Bank's new Commitment as
 set forth in Schedule 1.01(a) hereto, executed by each party thereto;

      (b) Payment of Fees and Expenses.  Evidence of payment by the Company of
 all accrued and unpaid Fees and Expenses to the extent then due and payable on
 the Effective Date and invoiced, together with any reasonable estimate of
 reasonable fees and expenses of outside counsel incurred or to be incurred by
 it through the closing proceedings (provided that such estimate shall not
 thereafter preclude final settling of accounts between the Company and such
 counsel);

      (c) Legal Opinions.

                (i) an opinion of Simpson Thacher & Bartlett, counsel to the
      Company, addressed to the Administrative Agent and the Banks, in form and
      substance satisfactory to the Administrative Agent; and

                (ii) a reliance letter by Simpson Thacher & Bartlett, counsel to
      the Company, addressed to the Administrative Agent and certain Banks,
      permitting such Banks to rely on the opinion of Simpson Thacher & Bartlett
      given in connection with Amendment No. 3 to the Credit Agreement, dated as
      of July 24, 1998.

           Notwithstanding the foregoing, Sections 1.01 and 1.04 of this
 Amendment shall not be effective until the opening of business in New York on
 the Business Day on which the Administrative Agent has notified the Company and
 the Banks that the Administrative Agent has received executed counterpart
 signature pages of this Amendment from each of the then participating Banks and
 upon satisfaction of all other conditions set forth in this Section 2.


                                  Article III

                                 MISCELLANEOUS

           3.1  Reference to and Effect on the Credit Agreement and the Other
 Loan Documents.

      (a) This Amendment modifies the Credit Agreement to the extent set forth
 herein, is hereby incorporated by reference into the Credit Agreement and is
 made a part thereof.  On and after the effective date, each reference in the
 Credit Agreement to "this Agreement", "hereunder", "hereof", "herein" or words
 of like import referring to the Credit Agreement, and each reference in 

                                      -4-

 
 the other Loan Documents to the "Credit Agreement", "thereunder", "thereof" or
 words of like import referring to the Credit Agreement shall mean and be a
 reference to the Credit Agreement as amended by this Amendment.

      (b) Except as specifically amended by this Amendment, the Credit Agreement
 and the other Loan Documents shall remain in full force and effect and are
 hereby ratified and confirmed.
 
      (c) The execution, delivery and performance of this Amendment shall not,
 except as expressly provided herein, constitute a waiver of any provision of,
 or operate as a waiver of any right, power or remedy of the Administrative
 Agent, any Bank or any Issuing Bank under, the Credit Agreement or any of the
 other Loan Documents.

           3.2  Representations and Warranties; No Default or Event of Default.
 On the date of effectiveness of any of the amendments herein (after giving
 effect to the consummation of the transactions contemplated by this Amendment
 to have occurred on or prior to such date), the Company shall be deemed to have
 certified to the Banks that, after giving effect to the amendments contained
 herein that become effective on such date all of the representations and
 warranties contained in the Credit Agreement are true and correct on and as of
 the date thereof with the same effect as if made on and as of such date (except
 to the extent such representations and warranties expressly refer to an earlier
 date, in which case they shall be true and correct as of such earlier date and
 except to the extent (x) the representations and warranties set forth in
 Section 6.05 of the Credit Agreement relate to any litigation which has been
 specifically disclosed to the Banks and which has been added to Schedule 6.05
 to the Credit Agreement with the written approval of the Majority Banks and (y)
 the representation and warranty set forth in Section 6.25 of the Credit
 Agreement relates to any event or condition which has been specifically
 disclosed to the Banks and which has been added to Schedule 6.25 to the Credit
 Agreement with the written approval of the Majority Banks).

           3.3  Headings.  Section and subsection headings in this Amendment
 are included herein for convenience of reference only and shall not constitute
 a part of this Amendment for any other purpose or be given any substantive
 effect.

           3.4  Applicable Law.  THIS AMENDMENT SHALL BE GOVERNED BY, AND SHALL
 BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF
 NEW YORK, WITHOUT REGARD TO CONFLICT OF LAWS PRINCIPLES.

           3.5  Counterparts.  This Amendment may be executed in any number of
 counterparts and by different parties hereto in separate counterparts, each of
 which when so executed and delivered shall be deemed an original, but all such
 counterparts together shall constitute one and the same instrument.

                                      -5-

 
           IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
 be duly executed and delivered by their respective officers thereunto duly
 authorized as of the date first written above.


                     CLARK REFINING & MARKETING, INC.


                     By:_________________________________
                         Name:
                         Title:


 

                                AGENTS
                                ------
 
                     BANKERS TRUST COMPANY
                      as Administrative Agent
                      and Collateral Agent


                     By:_________________________________
                         Name:
                         Title:


 

                     THE TORONTO DOMINION BANK
                      as Syndication Agent

 

                     By:_________________________________
                         Name:
                         Title:

 
                     BANKBOSTON, N.A.
                      as Documentation Agent

 

                     By:_________________________________
                         Name:
                         Title:

                                     BANKS
                                     -----

                                      -6-

 
                     ABN AMRO BANK
                        as a Bank

 
                     By:_________________________________
                         Name:
                         Title:


                     By:_________________________________
                         Name:
                         Title:

 


                     ARAB BANKING CORPORATION (B.S.C.)
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:



 
                     BANKBOSTON, N.A.
                        as a Bank
 

                     By:_________________________________
                         Name:
                         Title:

 
 

                     BANKERS TRUST COMPANY
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:

                                      -7-

 
                     BANK OF SCOTLAND
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:


                     BHF-BANK AKTIENGESELLSCHAFT


                     By:_________________________________
                         Name:
                         Title:



                     COMERICA BANK
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:

 


                     CREDIT LYONNAIS NEW YORK BRANCH
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:



                     DEN NORSKE BANK ASA
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:


                     By:_________________________________

                                      -8-

 
                         Name:
                         Title:



                     FINOVA CAPITAL CORPORATION


                     By:_________________________________
                         Name:
                         Title:



                     THE FIRST NATIONAL BANK OF CHICAGO
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:

 
                     FREMONT FINANCIAL CORPORATION


                     By:_________________________________
                         Name:
                         Title:

                                      -9-

 
                     THE FUJI BANK, LIMITED
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:

 
                     GREEN TREE FINANCIAL SERVICING
                     CORPORATION
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:

 

                     HIBERNIA NATIONAL BANK
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:



                     MERCANTILE BANK NATIONAL ASSOCIATION
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:



                     MITSUBISHI TRUST & BANKING CORP.
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:



                     THE SANWA BANK LIMITED

                                      -10-

 
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:

                     STANDARD CHARTERED BANK
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:


                     By:_________________________________
                         Name:
                         Title:



                     SOCIETE GENERALE, SOUTHWEST AGENCY
 

                     By:_________________________________
                         Name:
                         Title:


                     TORONTO DOMINION(TEXAS), INC.
                        as a Bank

 
                     By:_________________________________
                         Name:
                         Title:



                     UNION BANK OF CALIFORNIA, N.A.
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:

                                      -11-

 
                     WELLS FARGO BANK (TEXAS), N.A.
                        as a Bank


                     By:_________________________________
                         Name:
                         Title:

 



                        ISSUING BANKS
                        -------------


                     BANKERS TRUST COMPANY
                        as Issuing Bank


                     By:_________________________________
                         Name:
                         Title:



                     TORONTO DOMINION (TEXAS), INC.
                        as Issuing Bank

 
                     By:_________________________________
                         Name:
                         Title:



                     BANKBOSTON, N.A.
                        as Issuing Bank
 
                     By:_________________________________
                         Name:
                         Title:

                                      -12-