Oil tumbled amid speculation that its increase to a three-month high level might have been excessive. WTI for February settlement fell to $92.49 a barrel, down 63 cents, and futures soared 1.4% to $93.12 a barrel, the most since September 18, while Brent oil for February delivery dropped 65 cents, or 0.6%, to $111.82 a barrel and New York crude was set at $92.48 a barrel.