US benchmark West Texas (WTI) Intermediate for September delivery eased nine cents to USD 98.08 while Brent crude for September gained six cents to USD 106.08 in afternoon trade.
WTI fell USD 2.10 in New York trade and Brent declined 49 cents in London today.
"Oil prices are under pressure at the moment after heavy selling on Wall Street," Michael McCarthy, market strategist at CMC Markets in Sydney, told AFP.
The equities sell-off has been attributed to a range of factors, including weak European inflation data, the Argentine default and softer US corporate earnings.
Analysts said oil prices were also pressured by reports that a number of oil refineries in the US midwest were experiencing outages.
The concern is that crude inventories will build at the closely-watched Cushing, Oklahoma oil-trading hub where WTI is priced, with the supply glut dampening prices.
The outages come ahead of planned maintenance in September at many refineries as the summer travel season ends.
The outages are seen to have a greater impact on WTI prices. Brent crude is more leveraged to the international oil market.
