Oil updated in line with charts Investing.com - Oil turned lower on Friday as a short-covering rally ran its course, exposing the market again to supply concerns.
U.S. crude was down 38 cents, or 0.91%, at $41.55 at 06:45 ET. Brent crude dropped 1.02% to $43.84.
Crude and refined products remain in plentiful supply, while there are signs of Chinese imports slowing.
The latest Baker Hughes rig count data are due out later Friday.
The number of rigs operating in the U.S. has been on the increase over the past few weeks.
The U.S. dollar index was slightly lower. A weaker dollar underpins demand for oil.