EYES ON SUPPLIES
Traders were also closely watching supply disruptions and threats. Enbridge Inc shut its 210,000 barrel per day Line 81 pipeline, which carries Bakken crude from North Dakota to Minnesota following the discovery of a small leak.
The shutdown comes as traders say ongoing maintenance at Syncrude Canada Ltd's northern Alberta oil sands projects tightens supplies of light sweet crude and bolsters prices for U.S. crudes such as Light Louisiana Sweet.
In addition, traders said BP had been forced to shut in its 250,000 bpd Thunder Horse oil platform in the Gulf of Mexico as work was performed on the Destin natural gas pipeline system which into which Thunder Horse connects.
BP said the North Sea Forties Pipeline System was operating under a "minor" restriction on flows that was likely to last another week or so.
Traders have also been focusing on violence in the Middle East and threats to supplies from the region, which have lent some support to Brent prices over recent weeks.
Protesters demanding jobs closed off the eastern Libyan port of Zueitina for a sixth day on Monday, extending a halt in oil exports, according to a senior oil industry source and one of the demonstrators.