BBC: Oil price reaches six-week high as dollar weakens
The price of oil has risen to a six-week high as reports of a rescue for debt-laden Greece lifted the euro and helped push the US dollar lower.
A weaker dollar makes oil cheaper for buyers in other currencies. The euro rose 0.2% to $1.3633.
It had fallen to a nine-month low of $1.3477 on Friday after the US Federal Reserve lifted a key interest rate.
US light, sweet crude oil rose 66 cents to $80.47 a barrel, before falling back to just above $80.
London Brent climbed 58 cents to $78.64.
German magazine Der Spiegel reported over the weekend that Germany's finance ministry had come up with a plan that would see countries that use the euro providing aid worth between 20bn and 25bn euros (£17.6bn-£22bn) for Greece.
"The weak dollar is the biggest driver of crude prices this morning and hopes of a financial rescue for Greece are propping up sentiments," said Clarence Chu, a trader with Hudson Capital Energy in Singapore.
