Oil slid to a five-week low yesterday, continuing a fund-led selling spree that has knocked 12 per cent from last week's record highs as rising stockpiles have eased worries of a winter supply crunch.

US light crude fell to $48.43 in early trade, the lowest level since late September, before recovering to sit up eight cents at $48.90 a barrel. London Brent crude fell six cents to $45.95 a barrel.

US crude has now racked up nearly $7 in losses in the last nine trading days from an all-time New York futures high at $55.67.

Rising crude and natural gas stockpiles in the United States and signs that high energy costs are hurting economic growth are gradually eroding a rally that had lifted prices more than 50 percent this year.

Analysts are undecided whether the sharp recent decline marks a turning point, or just a correction to the year's breakneck advance.

"We think that despite the market's decline over the past week, we still may have lower to go, as we have not yet seen the heavy volume or serious drop in open interest that is a telltale sign of fund liquidation," said Man Energy's Edward Meir.

Others were expecting firmer support from fundamentals. "Aggressive speculative shorting of the market is the main factor behind the recent price fall," wrote analysts at Barclays Capital.

"Gross short positions across crude oil, gasoline and heating oil contracts combined are close to their highest ever levels suggesting that there is a growing risk of a violent short-covering rally in oil."

The Opec producers cartel, which controls more than half of world crude exports, has lifted production above 30 million barrels per day (bpd) to meet booming oil demand.

The group pumped 30.11 million bpd in October, down just 40,000 bpd on the month, a Reuters survey found on Thursday. Opec's supply surge has helped rebuild US crude stocks, which have risen 10 million barrels in the past two weeks. This has assuaged some supply concerns that have plagued the market since September's Hurricane Ivan, which knocked out more than a quarter of Gulf of Mexico production for weeks.

As of Thursday, the region's oil output had recovered to 87.5 per cent of its 1.7 million bpd capacity.

A cold snap in the United States could stem oil's slide, analysts said. "Even in a normal winter weather scenario, we see a relatively tight distillate market," said Katherine Spector, Global Energy Strategist with J.P. Morgan bank in a report.

US heating oil inventories are 16 percent below this time last year as seasonal maintenance at refineries and growing diesel demand from the trucking industry have hampered the usual build up of distillates, including winter fuels.

Crude flows through Iraq's northern pipeline were halted on Wednesday after this week's sabotage attacks, extending a string of oil supply disruptions from the war-torn country.

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