* OPEC expected to cut output at Friday meeting
* Asian demand for West African crude down
* Stock markets fall on recession concerns (Recasts, updates prices, market activity, changes byline, new dateline, previously LONDON)
By Edward McAllister
NEW YORK, Oct 21 (Reuters) - Oil tumbled more than 5 percent on Tuesday amid worries a global recession will crush fuel demand, limiting the impact of any supply cuts by OPEC.
U.S. oil for November delivery <CLc1> tumbled $3.98 a barrel to $70.27 by 12:33 p.m. (1633 GMT), after hitting a session high of $75.69.
London Brent crude <LCOc1> traded $3.33 down to $68.70 a barrel.
The slide came as U.S. stocks fell on concern that earnings could be driven down by slower consumer demand. [
]"Crude prices are down on demand consideration, with weakness being stoked by bearish economic data," said Kyle Cooper, director of research at IAF Advisors.
Total Asian demand for West African crude was down 27 percent to 918,000 barrels per day (bpd) in November from 1.25 million bpd in October as demand from India, Indonesia and Taiwan decreased, according to traders. [
]The oil market has slid 50 percent since hitting a record high above $147 in mid-July. The fall came as demand slumped in the United States, the world's largest energy consumer, and other industrial countries hit by the credit crisis.
The Organization of the Petroleum Exporting Countries is due to meet in Vienna on Friday. The producer group is expected to reduce output to defend prices and temper the effects of the financial crisis.
Iran has said a drop in demand could push OPEC to cut output by 2-2.5 million barrels per day (bpd), while other members have said a smaller cut may be needed.
"A cut of about 2 million barrels per day will only offset the amount of U.S. demand that has been lost on a year-over-year basis," said Edward Meir of broker MF Global.
"This leaves no extra barrels to offset the demand vaporization that is almost certainly taking place in other consuming markets," he said.
OPEC could face an intense debate on how much oil members should take off global markets as they balance their price needs against risks to a fragile world economy. [
]The International Energy Agency, which advises industrialised countries, has said an OPEC output cut could prolong a global economic slowdown.
MARKETS SLIDE
Oil and commodities have tracked equity markets in the past few weeks as the financial crisis hit the demand outlook.
U.S. stocks fell on Tuesday amid concerns the global economy might be sliding towards recession [
].European shares gave up early gains that had followed a rise in U.S. stock markets on Monday.
"I think (oil prices) moved in line with equities yesterday and are now pulling back, using stock markets as a barometer for demand," said Christopher Bellew at Bache Commodities.
Japan and France extended more help to banks, the IMF prepared to intervene in trouble spots around the world and the Fed devised a new plan to inject liquidity into money markets to curb the worldwide financial crisis. [
]U.S. crude oil inventories probably rose 2.3 million barrels last week, a preliminary Reuters poll showed ahead of the U.S. government energy data due on Wednesday.
The poll also showed forecasts for a 100,000-barrel rise in distillate inventories, which include heating oil and diesel, and a 2.1 million barrel gain in gasoline supplies. (Reporting by Edward McAllister, Gene Ramos and Robert Gibbons in New York; Joe Brock and Jane Merriam in London; Fayen Wong in Perth; Editing by David Gregorio)