EXHIBIT 4 RESOLUTION FOR RIGHTS PLAN EXTENSION ADOPTED BY THE BOARD OF DIRECTORS ON DECEMBER 15, 1995 RESOLVED, that pursuant to the last sentence of Section 26 of the Rights Agreement dated December 16, 1985 (the "Rights Agreement"), between Tesoro Petroleum Corporation and InterFirst Bank of Fort Worth, N.A. (now, by substitution, Chemical Bank), the Board of Directors, in the name and on behalf of the Company, hereby elects to change the Expiration Date, as defined in the Rights Agreement, to be the close of business on July 24, 1996.