Members of OPEC were immediately in discussions about reducing output to correct what it called oversupply.
The benchmark US light crude for November delivery was down by more than $4 to $88 in its fourth consecutive day of losses. This comes after the near 40% fall in oil prices since they hit $147 in July, and North Sea Brent crude was also down by $6 to $84 a barrel.
Edward Meir, of the broker MF Global, said: "The prevailing macro sentiment is now crystallising around the notion that we are heading into a synchronised global slowdown, a mirror image of the across-the-board expansion we saw from 2004 to early 2007."
Oil demand in the United States, the world's top energy consumer, has dived this year under the weight of record prices, while consumption in Japan and Europe has also weakened.
Coffee, sugar and grain prices were down sharply, while copper fell by almost 8% to a 20-month low although gold, a traditional safe haven in turbulent times, was firmer, recouping losses caused mainly by the strong dollar.




