U.S. light, sweet crude fell $3.35 to $41.25 a barrel by 2:24 a.m. EST, reversing a part of Wednesday's $5.57 a barrel gains. Oil tumbled 54 percent in all last year.

London Brent crude fell $3.41 a barrel to $42.18.

(Reporting by Chua Baizhen; Editing by Ramthan Hussain)