New York's main contract, West Texas Intermediate (WTI) for February delivery, was down 23 cents at USD 98.68 in afternoon trade while Brent North Sea crude for February eased two cents to USD 111.54.
"There hasn't been much movement in the commodity or currency markets ahead of the holidays, and traders are currently squaring off their positions," Ric Spooner, chief market analyst at CMC Markets in Sydney, told AFP.
"We are seeing some profit-taking with the WTI contract after the rally last week," he said.
Singapore-based Phillip Futures said oil prices retained firm support owing to buoyant sentiment about US demand, while supplies continue to be curtailed from OPEC members Libya and Iran.
Output from Libya has been hit by a months-long blockade of critical oil-exporting terminals, while Iranian exports have been halved to 1.2 million barrels per day following crippling international sanctions imposed on it because of its disputed nuclear programme.
