Oil rose above $133 on Monday due to lingering supply concerns from key oil producer Nigeria and a partial shut-in at the North Sea oilfields.
London Brent crude rose $1.46 to $133.03 a barrel by 6:36 a.m. EDT (1036 GMT), marking a larger gain than U.S. crude.
U.S. crude rose $1.10 cents to $133.29. Last week, it struck a record high of $135.09.
Nigeria's army confirmed on Monday there had been an explosion at an oil facility owned by Royal Dutch Shell (RDSa.L: Quote, Profile, Research), hours after Niger Delta rebels claimed to have blown up a pipeline.
Impact on output from the most recent blast was not immediately clear.
"Nigeria continues to experience supply problems," Robert Laughlin with MF Global said in a research note.
Oil output in Nigeria, an OPEC member and Africa's top producer, has been erratic in recent months due to repeated rebel attacks to oil facilities and a workers' strike in April.
In Europe, Norwegian oil and gas producer StatoilHydro (STL.OL: Quote, Profile, Research) said Statfjord A in the North Sea, which produces 19,000 barrels of oil per day, remains shut after an oil leak on Saturday.
