Crude oil dipped on Tuesday on expectations of rising OPEC output and a potential increase in U.S. shale production, but analysts said that strong refinery demand was preventing further price falls. “Investors remained cautious heading into the OPEC … meeting this Friday, with Brent coming under the most selling pressure,” ANZ bank said on Tuesday. This comes at a time when U.S. shale oil producers are also positioning for a resumption in output after this year’s price rises,” it added.