Oil prices have traded mixed, with the main US contract gaining 11 per cent and Brent holding stable amid geopolitical tensions in the oil-rich Middle East.
US benchmark West Texas Intermediate (WTI) for November leaped $US1.01 to close at $US93.54 a barrel on the New York Mercantile Exchange.
Brent North Sea crude for delivery in November, the global benchmark, was unchanged from Thursday's close at $US97.00 a barrel in London trade.
"Geopolitical concerns are adding some support to prices heading into the weekend," said Matt Smith, an analyst at Schneider Electric.
Investors were focused on US-led air strikes against jihadists in the oil-rich Middle East. The air strikes in Syria disrupted the Islamic State group's lucrative oil-pumping operations, which experts say typically earn the jihadists between $US1 million and $US3 million in sales a day.
The market also weighed fresh data on US economic growth in the second quarter that was revised upward by 0.4 percentage point to a healthy annual rate of 4.6 per cent, the strongest pace since late 2011 in the world's largest consumer of crude oil.
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