Singapore - Crude was mixed in Asian trade on Friday with prices supported by the unrest in Libya and other oil-producing countries in the region, analysts said.
New York's main contract, light sweet crude for delivery in May, lost three cents to $105.57 per barrel while Brent North Sea crude for May rose 21 cents to $115.93.
"Oil prices remain well supported against a geopolitically charged backdrop and strong fundamental underpinnings... Within those dynamics, the fundamentals of the oil market have shown no signs of easing," Barclays Capital's analysts said in a report.
Traders have been watching the wave of anti-government protests in the Middle East and North Africa.
Nato late Thurday agreed to enforce the no-fly zone over Libya to stop Moamer Kadhafi's jets from flying.
Oil-rich Libya was producing 1.69 million barrels a day before the unrest, according to the International Energy Agency. It is now producing 400 000 barrels a day.