Crude markets hurdled $88 in Asia after hitting 25-month highs the day before as inventories unexpectedly fell in the United States.
US crude for December delivery rose 68c to $88.49 a barrel. Brent North Sea crude for December advanced 62c to $89.58.
Elsewhere, the Organisation of Oil Exporting Countries (OPEC) revised upwards its world oil demand growth estimates for both 2010 and 2011 amid cautious optimism about the global economic outlook.
OPEC said it was pencilling in world oil demand growth of 1.32m barrels per day (bpd) or 1.6% to 85.78m bpd for the whole of 2010, compared with 1.3% previously.
And in 2011, oil demand would then increase by a further 1.17m bpd (1.4%) to 86.95m bpd, instead of the previous estimate of 1.2%, the cartel said in its latest monthly bulletin.
'Despite initial economic assessments that underestimated the second half of the year's economic activities, oil demand is picking up in the third and fourth quarters,' OPEC wrote.
In industrialised nations, in particular, oil consumption had outpaced expectations as a result of the stronger-than-expected economic activities, supported by various stimulus plans.
Looking ahead to next year, 'optimism about the outlook for world economic activity is growing to some degree,' OPEC said.
And the improved outlook for demand in industrialised nations was a 'key factor' behind the upward revision of OPEC's forecast,
'However, given the higher baseline, oil demand growth is expected to be lower than in the current year,' it cautioned.
Furthermore, the expected economic recovery 'is moving in slow motion and experiencing surprising turbulence,' OPEC said.
