By Nick Godt
NEW YORK (MarketWatch) -- Crude oil futures turned lower on Wednesday, with traders adopting a cautious tone ahead of the release of weekly U.S. petroleum supplies data. Crude oil for April delivery was last down 6 cents at $81.43 a barrel in electronic trade, losing earlier gains that saw the contract trade as high as $81.95 a barrel. Crude rose earlier after OPEC raised its forecast for global oil demand and China reported strong trade data.
