Investing.com - Oil was higher Monday but with gains capped by expectations of higher U.S. supply.
Brent crude was up 37 cents, or 0.66%, at $56.18 at 08:00 ET. U.S. crude added 25 cents, or 0.46%, to $54.03.
Trading volumes were on the low side due to the U.S. Presidents Day holiday.
Baker Hughes weekly figures Friday showed a rise in the U.S. rig count of six to 597, the highest level since November 2015.
Increased North American shale activity could offset agreed cuts by other major producers.
OPEC has estimated an initial high compliance level with cuts of 1.2 million barrels per day at the start of this year for six months.
Non-OPEC members led by Russia have also agreed to cut production by 558,000 barrels a day.