DIAMOND SHAMROCK <DIA> RAISES CRUDE OIL POSTINGS Diamond Shamrock said it raised its posted prices for all grades of crude oil one dlr a barrel, effective yesterday. The one dlr increase brings West Texas Intermediate, WTI the U.S. benchmark crude, to 17.00 dlrs a bbl, the company said. Diamond Shamrock joined Sun Co, Coastal, Citgo and Murphy Oil in raising crude oil posted prices one dlr a barrel yesterday.