Official data released Wednesday showing US commercial crude inventories climbing to a fresh record high last week further underscored concerns about a market brimming with supplies and not enough demand.
At around 0345 GMT (0915 IST), US benchmark West Texas Intermediate for delivery in May fell 29 cents to USD 38.05 while Brent crude for June, a new contract, was down 34 cents at USD 39.99.
Shailaja Nair, senior managing editor at global energy information provider Platts, said "unchanged fundamentals" of supply and demand remain a key influence on market sentiment.
Major oil producers led by Russia and Saudi Arabia will meet on April 17 in Doha to discuss measures to stabilise prices, including a proposal to freeze output.
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But Nair said only a decision to cut production rather than an output freeze will boost prices.
"Considering the amount of crude already in the market, a freeze is not going to make much of a difference," she said.
A slip in the dollar was unable to provide any lift. The greenback tumbled this week after Federal Reserve chief Janet Yellen trod a cautious line about the outlook for the global economy and said US interest rates were unlikely to rise before June.
A weaker greenback typically bolsters the appeal of the dollar-priced commodity for buyers using stronger currencies.