CALTEX RAISES SINGAPORE OIL PRODUCT PRICES Caltex Petroleum Corp, a joint venture between Chevron Corp <CHV> and Texaco Inc <TX>, said it raised posted prices for several petroleum products in Singapore, effective today. The company said its naphtha posting is up three cts a gallon to 43 cts. It said it is raising jet and kerosene postings 2.5 cts, bringing jet to 52.5 cts and kerosene to 51.5 cts. Diesel grades are up two cts, Caltex said, bringing both diesel gas oil (one pct sulfur) and 52-57 D.I. (55 cetane) to 52 cts a gallon, and diesel gas oil (0.5 pct) to 52 cts. The company said it is increasing medium and heavy fuel oil postings by one dlr a barrel. Medium is now 15.50 dlrs a barrel, and heavy fuel is 14.75 dlrs.