USX <X> UNIT RAISES SOME CRUDE POSTINGS Marathon Petroleum Company, a subsidiary of USX Corp <X>, said it raised the contract price it pays for three grades of crude oil, effective March 6. Illinois Sweet and Indiana Sweet are both being raised 50 cts a barrel to 16.75 dlrs/bbl, and the Southern Michigan grade is being raised 25 cts/bbl, also to 16.75 dlrs a bbl. The West Texas Intermediate grade was unchanged.