Analysts expected a drop of 2 million barrels for this week.
The API reported a decline of 5.521 million barrels in the previous week.
Oil prices rose on Tuesday.
The West Texas Intermediate for October delivery gained 1.55 dollars, or 1.78 percent, to settle at 88.84 U.S. dollars a barrel on the New York Mercantile Exchange. Brent crude for November delivery went up 1.42 dollars, or 1.57 percent, to settle at 92.06 dollars a barrel on the London ICE Futures Exchange.
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