UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT

                   Pursuant to section 13 or 15 (d) of the
                         Securities Exchange Act of 1934

       Date of Report (Date of earliest event reported): February 28, 2002

                               PREMCOR USA INC.
            (Exact name of registrant as specified in its charter)


            Delaware                                 43-1495734
  (State or other jurisdiction                    (I.R.S. Employer
of incorporation or organization)                Identification No.)

      8182 Maryland Avenue                           63105-3721
       St. Louis, Missouri                           (Zip Code)
(Address of principal executive offices)

                                 CLARK USA, INC.
                         (Former name of registrant)

      Registrant's telephone number, including area code (314) 854-9696








                                Page 1 of 4 pages

                         Exhibit Index begins on page 4


Item 5.  Other Events.

        On February 28, 2002 Premcor Inc. ("Premcor"), which owns all of the
outstanding common stock of Premcor USA Inc., announced that it will
discontinue refining operations at its Hartford refinery in October of 2002. A
copy of Premcor's press release making such announcement is attached hereto and
incorporated herein by reference in its entirety.


Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits.

     (c) The following Exhibit is filed with this Current Report on Form 8-K:

         Exhibit No.          Description

         99                   Press Release dated as of February 28, 2002



                               Page 2 of 4 pages.

                         Exhibit Index begins on page 4.


SIGNATURE

   Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                                     PREMCOR USA INC.
                                                       (Registrant)




                                            /s/  Dennis R. Eichholz
                                         ---------------------------------------
                                          Dennis R. Eichholz
                                          Senior Vice President, Finance and
                                            Controller (Principal Accounting
                                                Officer)



March 1, 2002

                               Page 3 of 4 pages.

                         Exhibit Index begins on page 4.


                                  EXHIBIT INDEX

Exhibit No.             Description

99                      Press Release dated as of February 28, 2002



                               Page 4 of 4 pages.