The West Texas Intermediate (WTI) for November delivery decreased 15 cents, or 0.2 percent, to settle at 85.46 U.S. dollars a barrel on the New York Mercantile Exchange. Brent crude for December delivery lost 1 cent to close at 91.62 dollars a barrel on the London ICE Futures Exchange.
Prospects of weaker energy demand amid a slowing global economy continued to weigh on markets.
Meanwhile, prices garnered some support from a major output cut decision announced earlier this month by the Organization of the Petroleum Exporting Countries and its allies, collectively known as OPEC+.
For the week ending Friday, the WTI dropped 7.6 percent, while Brent slid 6.4 percent, based on the front-month contracts.
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