Oil slips as sources say API data show a weekly rise in US crude supplies MarketWatch Oil prices slipped in electronic trading Tuesday after the American Petroleum Institute reported a climb of 882,000 barrels in U.S. crude supplies for the week ended May 12, according to sources. The API data showed a fall of 1.8 million barrels in ... Oil Prices Slip After US API Reports Build In Crude Stocks Private oil inventory data out - oil price drops |