	dupont unit raises  oil postings conoco inc a subsidiary of dupont denemours dd said it raised the contract price it will pay for all grades of  oil cts a barrel effective yesterday the increase brings conoco s posted price for west texas intermediate to dlrs a barrel the west texas sour grade at api now stands at dlrs a barrel light louisiana was also raised cts to dlrs barrel conoco last changed its  postings on may reuter 
