FUNDAMENTALS
NYMEX crude for December delivery was down 15 cents at $80.97 a barrel by 0002 GMT, after settling down $1.08 on Thursday.
US crude is on course to post a fourth straight monthly decline of around 11 percent.
London Brent crude for December delivery was down 21 cents at $86.03 a barrel, after settling down 88 cents.
A 3.5 percent annual rise in third-quarter US gross domestic product reported on Thursday also reinforced investor confidence over the economy, lending to a more hawkish interest rate outlook.
A 25 percent slide in oil prices since June had raised talk that the Organization of the Petroleum Exporting Countries may need to curb output, but little momentum has built up around a production cut, the first since the 2008 financial crisis.
In a deal that could curb heating oil consumption in winter, Ukraine, Russia and the European Union signed a deal on Thursday that will see Moscow resume vital supplies of gas to its ex-Soviet neighbour over the winter in return for payments funded in part by Kiev's Western creditors.
MARKETS NEWS
US stocks rose on Thursday, boosted by a strong reading on quarterly economic growth and by another round of upbeat earnings reports.
The dollar held at four-week highs against a basket of major currencies early on Friday, getting another boost from encouraging growth data.