SOUTHLAND <SLC> UNIT RAISES CRUDE POSTINGS Southland Corp's Citgo Petroleum Corp said it raised the contract price it will pay for crude oil 50 cts a barrel, effective today. The increase bring's Citgo's posted price for the West Texas Intermediate and West Texas Sour grades to 17.50 dlrs a barrel. The Light Louisiana Sweet South Onshore grade was also raised 50 cts to 17.85 dlrs a barrel, and Light Louisiana Sweet North was increased to 17.75 dlrs a barrel. Citgo last changed its postings on March four.