Oil markets declined for the fourth day in a row as doubts resurfaced on the Euro zone's rescue plan and concerns over China's slow factory output continued.
US crude CLc1 slipped 79 cents to $91.49 a barrel while Brent crude LCOc1 lost 46 cents, falling to $109.08 a barrel.
Greek Prime Minister George Papandreou's call for a vote on the currency bloc's bailout plan offered a gloomy global outlook, raising the fear of a contagion in the continent.
In China, slower manufacturing has raised concerns that the nation's demand for metals and fuel will increase at a slower place in 2012.
The collapse of brokerage firm MF Global Holdings also added to the European crisis, reports Reuters.
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