The West Texas Intermediate for December delivery rose 9 cents to settle at 41.45 dollars a barrel on the New York Mercantile Exchange, while Brent crude for January delivery increased 19 cents to close at 43.80 dollars a barrel on the London ICE Futures Exchange.
"Oil prices are still surging ahead regardless of the negative fundamental environment," Eugen Weinberg, energy analyst at Commerzbank Research, said in a note Wednesday.
"We believe that improved investor sentiment is chiefly responsible for the latest rally," he added.
Traders also await official U.S. crude inventories data set to be released by the U.S. Energy Information Administration on Thursday.
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