U.S. light crude for the delivery in June dropped 40 cents a barrel to $117.90 a barrel after gaining 23 cents in New York on Wednesday.
But prices eased as crude oil stocks surged by 2.4 million barrels, double the forecast level, mainly from gains on the West Coast.
The dollar's recovery against the euro and falls in other commodities such as gold also undermined prices.
U.S. gasoline inventories fell for the sixth straight week, by 3.2 million barrels against the forecast for a 2.3 million decline.
Refinery workers at Britain's Grangemouth refinery are due to begin a two-day strike on Sunday that will shut the plant and squeeze fuel supplies in Scotland and northern England.




