The API said rose by 10.485 million last week.
Analysts expect that the Energy Information Administration will report a build of 3.997 million barrels when it issues numbers tomorrow morning. The are due at 10:30 AM ET (14:30 GMT).
WTI futures were up 1.05% following the release, after settling up, 1.94%, or 39 cents, at $20.48 barrel today in regular trading.
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