Exhibit 99.1


                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the quarterly report of Wilshire Oil Company of Texas (the
"Company") on Form 10-Q for the quarter ended March 31, 2003 filed with the
Securities and Exchange Commission (the "Report"), I, S. Wilzig Izak, Chief
Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350,
as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) of the
Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material
respects, the consolidated financial condition of the Company as of the dates
presented and consolidated results of operations of the Company for the periods
presented.

Dated: May 14, 2003

                                     By: /s/ S. Wilzig Izak
                                         --------------------------------------
                                         S. Wilzig Izak
                                         Chief Executive Officer



This certification has been furnished solely pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002.