Investing.com - Oil was lower Monday on supply concerns as the number of rigs operating in the U.S. continued to rise.
Brent crude was off 28 cents, or 0.50%, at $55.62 at 08:00 ET. U.S. crude shed 27 cents, or 0.51%, to $53.06.
Baker Hughes data Friday showed the U.S. rig count rise by a further seven to 609.
U.S. crude inventories remain near record highs of 520.2 million barrels.
There also concerns about Russian compliance with agreed output cuts. Russian output in February was flat.
Russia and other non-OPEC producers have agreed to cut output by some 558,000 barrels a day in the first half of the year.
OPEC compliance with agreed cuts of 1.2 million barrels a day has been high so far.
China lowered its GDP growth forecast for this year to 6.5% which could weigh on demand for oil.