Oil fell towards $82 a barrel on Wednesday, extending the steepest one-day percentage loss in three months in the previous session, on rising oil inventories and a firm dollar.

The dollar surged to a one-year high against a basket of six major currencies. It climbed to its strongest since last May against the Swiss franc as share markets around Asia lost ground on heightening fears that Greece's debt woes could spread to other countries.

US crude for June delivery fell 37 cents to $82.37 a barrel by 0459 GMT. The contract dropped $3.45, or 4 percent, to settle at $82.74 a barrel on Tuesday. In post-settlement trading, it ended electronic trading at $82.07, down $4.15 or 4.78 percent, the largest one-day percentage loss since the 4.99 percent slide on February 4.

London Brent crude lost 32 cents to $85.35 a barrel. "The main influences now are the rise in the dollar, the sovereign concerns in the euro zone spreading into Portugal and Spain. I think a pretty important factor though going forward is the build in oil stocks in the United States," said Ben Westmore, an analyst at National Australia Bank.

"The price at those low $80s per barrel sort of mark is consistent with the market fundamental alone. I would expect oil price to track around the low $80s for the rest of the week."

The dollar, which rose 0.37 percent against a basket of currencies on Wednesday, was supported by signs that the US
economy was on the mend.

Data released on Tuesday showed pending US home sales rose 5.3 percent in March while factory orders increased 1.3 percent. Both numbers handily beat forecasts.

A strong US currency makes dollar-denominated commodities, such as oil, more pricey for holders of other currencies and tends to dampen crude prices.   

Crude oil inventories at the key storage hub at Cushing, Oklahoma, rose by 1.7 million barrels to a record high of 36.3 million barrels, data from industry group the American Petroleum Institute (API) showed. -Reuters