New York's main contract, light sweet crude for delivery in September, dipped 79 cents to USD 82.10 per barrel. Brent North Sea crude for September delivery fell USD 1.10 to USD 105.58.
"The current decline is some pull back after we saw the Dow Jones (Industrial Average) drop by four percent on Wednesday," said Ker Chung Yang, commodity analyst for Phillip Futures in Singapore.
"I think markets are being weighed down by global equities markets... market sentiment is still uncertain as to what's going to happen in Europe and the US," he told AFP.
US stocks plummeted over four percent Wednesday, more than wiping out a rebound as European debt troubles and worries of a new US recession kept investors nervous.
The Dow Jones Industrial Average closed down 519.83 points (4.62 per cent) to 10,719.94, reversing its 430-point gain on Tuesday, and the broader S&P 500 fell 51.77 points (4.42 per cent) to 1,120.76.
The tech-heavy Nasdaq lost 4.09 per cent, or 101.47 points, to 2,381.05. Asian equities markets were also hammered, with South Korean, Chinese, Hong Kong, Japanese and Australian bourses down by one to four percent in early trade today.