The West Texas Intermediate (WTI) for December delivery decreased 47 cents, or nearly 0.6 percent, to settle at 84.58 U.S. dollars a barrel on the New York Mercantile Exchange. Brent crude for December delivery lost 24 cents, or 0.3 percent, to close at 93.26 dollars a barrel on the London ICE Futures Exchange.
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The above market moves came as economic fears outweighed tight supply concerns.
"Mounting risks to global growth mean that demand expectations are likely to ease," UBS analysts said in a note.
For the week ending Friday, the WTI rose 0.5 percent, while Brent advanced 2 percent, based on the front-month contracts.