New York's main contract, West Texas Intermediate for April delivery, fell 40 cents to USD 102.42 in mid-morning trade.
Brent North Sea crude for April was down 15 cents to USD 110.49.
"Lack of strong supportive news contributed to some downside in crude oil," Tan Chee Tat, investment analyst at Singapore-based Phillip Futures, told AFP.
Tan said Asian investors were wary that they could be in an "overbought situation" as the winter season in the West wanes and demand dips.
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Traders are expecting the latest US stockpiles data tomorrow to show a dip at the Cushing, Oklahoma, depot as the return of cold weather in large parts of the country boosts current demand for heating oil.
US housing data to be released later today will be closely watched "as markets looks towards assessing how much is weather a factor in stalling the US housing recovery in recent months," Singapore's United Overseas Bank said.
Ukraine, a major energy consumer, is also in focus after the dramatic ouster of its pro-Russian president and its appeal for USD 35 billion in Western aid to stave off an economic meltdown.