Exhibit 16.2 March 10, 1997 Securities and Exchange Commission 450 Fifth Street, N.W. Washington, D.C. 20549 Ladies and Gentlemen: We have read Item 4 of Ultramar Diamond Shamrock Corporation's Form 8-K dated March 4, 1997 and are in agreement with the statements contained in paragraph 4(a) therein as they relate to Price Waterhouse LLP. Yours very truly, /s/ Price Waterhouse LLP W5068.TW