Brent rose on Tuesday supported by instability in Libya while U.S. oil for June delivery dipped modestly, as expectations for an increase in domestic stockpiles competed with buying pressure on the contract's last day of trading.

The El Feel and El Shahara oilfields in western Libya were still shut more than a week after the government said protests there were over, an official said, and output was flat at 210,000 barrels a day.