X0201 4/A 2004-01-06 2004-01-07 0 0000898444 PREMCOR USA INC PCO 0000797468 OCCIDENTAL PETROLEUM CORP /DE/ 10889 WILSHIRE BOULEVARD LOS ANGELES CA 90024 0 0 1 0 0001259247 OCCIDENTAL C O B PARTNERS 110 WEST 7TH STREET P.O. BOX 300 TULSA OK 74102 0 0 1 0 0000315185 PLACID OIL CO 10889 WILSHIRE BOULEVARD LOS ANGELES CA 90024 0 0 1 0 0000728399 OXY USA INC 5 GREENWAY PLAZA HOUSTON TX 77046 0 0 1 0 0001259246 OCCIDENTAL OIL & GAS HOLDING CORP 10889 WILSHIRE BOULEVARD LOS ANGELES CA 90024 0 0 1 0 0001259248 OCCIDENTAL PETROLEUM INVESTMENT CORP 10889 WILSHIRE BOULEVARD LOS ANGELES CA 90024 0 0 1 0 Stock option (right to buy) 26.14 2004-01-06 4 A 0 2500 0 A 2014-01-06 Common Stock 2500 2500 I by subsidiary The option was granted pursuant to the Premcor Inc. Outside Director Compensation Program to Occidental C.O.B. Partners in lieu of its designee on the Premcor Board of Directors. The option vests in five equal annual installments beginning on January 6, 2005. Owned by Occidental C.O.B. Partners, an indirect wholly-owned subsidiary of Occidental Petroleum Corporation. /s/ J. R. HAVERT, Vice President and Treasurer 2004-01-14