Analysts expected a decrease of about 1.558 million barrels for this week.
The API reported a decline of 4.28 million barrels in the previous week.
Oil prices fell on Tuesday as Russia-Ukraine peace talks showed progress.
The West Texas Intermediate for May delivery lost 1.72 U.S. dollars, or 1.6 percent, to settle at 104.24 dollars a barrel on the New York Mercantile Exchange. Brent crude for May delivery decreased 2.25 dollars, or 2 percent, to close at 110.23 dollars a barrel on the London ICE Futures Exchange.
The above market reactions followed reports of progress in peace talks between Russia and Ukraine.
The two sides held a fresh round of face-to-face peace talks in Istanbul on Tuesday. Russian chief negotiator said the talks were "constructive."
Meanwhile, traders continued to assess the impact of COVID-19 on fuel demand.
On Monday, oil market experienced a marked pullback with the U.S. crude standard and Brent tumbling 7 percent and 6.8 percent, respectively.
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