Benchmark crude for September delivery was down 35 cents to $78.01 a barrel at late afternoon Singapore time in electronic trading on the New York Mercantile Exchange. The contract rose $1.37 to settle at $78.36 on Thursday.
Most Asian stock markets were lower after the Dow Jones industrial average dropped 0.3 percent Thursday and Japan reported a higher jobless rate, falling consumer prices and lower industrial production.
Oil traders often look to stock markets as a barometer of overall investor sentiment.

Investors are cautious ahead of the second-quarter U.S. economic growth number, due to be announced later Friday. Analysts expect GDP expanded about 2.5 percent in the April-to-June quarter, slowing from 2.7 percent in the first quarter.
Some analysts expect the global economy to slow in the second half, undermining demand for oil.
"The global recovery heading into slow motion will leave the market well supplied, subsequently putting downside pressure on prices," Saxo Capital said in a report.
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 Saxo expects prices to fall to $60 at the end of the year, "barring geopolitics or devastating hurricane."
In other Nymex trading in August contracts, heating oil fell 1.22 cents to $2.025 a gallon, gasoline dropped 1.27 cents to $2.0847 a gallon and natural gas rose 1.4 cents to $4.841 per 1,000 cubic feet.
Brent crude was down 64 cents to $76.95 a barrel on the ICE futures exchange.
[Associated
Press; By ALEX KENNEDY]
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