Oil dips on dollar, rig count rise; focus still on OPEC

By Ethan Lou NEW YORK (Reuters) - Oil prices fell slightly on Friday as traders balanced a stronger dollar and another increase in the U.S. oil rig count against expectations that more OPEC talk of output cuts will keep crude above $50 per barrel. The dollar posted its best weekly performance in more than seven months against a basket of currencies, weighing on prices of greenback-denominated commodities, including crude oil. It was the 16th week in a row that oil drillers had gone without makin