"The easing of the geopolitical tensions and the plentiful supply of the market give little reason for any rise in prices," analysts from Commerzbank in Frankfurt said in a note to clients.
Upbeat news about the U.S. economy had pushed prices higher Thursday, ending a five-day losing streak in which oil had dropped $5.41, or 5 percent. But the momentum petered out on Friday.
Brent crude, the benchmark for international crudes used by many U.S. refineries, was down 51 cents to $108.70 a barrel on the ICE Futures exchange in London.
In other energy futures trading on Nymex:
Wholesale gasoline fell 1.18 cents to $2.6769 per gallon.
Natural gas retreated 2.8 cents to $3.539 per 1,000 cubic feet.
Heating oil lost 1.2 cents to $2.9873 per gallon.
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Pamela Sampson in Bangkok contributed to this report.