USX &lt;X> UNIT TO RAISE MOST CRUDE POSTINGS

  USX's subsidiary, Marathon Petroleum
  Co, said it will raise its contract prices for eleven grades of
  crude oil 50 cts a barrel, effective tomorrow.
      The increase brings Marathon's posted price for West Texas
  Intermediate and West Texas Sour grades to 17.50 dlrs a barrel.
      The Light Louisiana grade was also raised 50 cts to 17.85
  dlrs a barrel.
  

