New York's main contract, light sweet crude for delivery in July, was up 20 cents to USD 85.22 a barrel and Brent North Sea crude for July delivery gained 20 cents to USD 100.84.
"Crude oil futures rallied... on growing hopes for a rescue of Spain's troubled banks to ease the eurozone debt crisis, and as a US Federal Reserve official hinted at more monetary easing," Phillip Futures said in a report.
French Finance Minister Pierre Moscovici yesterday said the eurozone was ready to "mobilise very rapidly" to assist Spain if Madrid requested it, tempering fears of a worsening crisis in the region's fourth largest economy.
In the US, Atlanta Federal Reserve President Dennis Lockhart said the Fed might need to consider more monetary easing if economic growth in the world's largest oil consumer hit more road blocks.
Stating that monetary policy was "appropriate" for the moment, Lockhart said in a speech posted on the bank's website that the Fed would likely consider more action if growth stalled.
"Should it become clear that something resembling my baseline scenario of continued, though modest, growth is no longer realistic, further monetary actions to support the recovery will certainly need to be considered," he said.