London: Oil eased to $91 a barrel on Monday as traders booked profits from sharp gains the previous session, but concern of further supply disruptions offered support.
US crude fell 67 cents to $91.10 a barrel by 1510 GMT, after climbing more than $3 on Friday. London Brent dropped 66 cents to $91.28.
Oil rose nearly a dollar earlier in the session, supported by Venezuela's threat to stop sending oil to the world's top fuel consumer, the US.
"Crude oil [is] in a wide price range as the market seems to be weighing fresh supply threats against clear indications of a slowing economy and weakening oil demand," said John Kilduff, senior vice-president at MF Global.
Venezuelan President Hugo Chavez made the threat on Sunday, after an ExxonMobil lawsuit froze $12 billion of Venezuelan assets to step up Exxon's push for compensation for a nationalised oil project.