* US Nov output, API weekly oil inventory data due later
* Awaits outcome of two-day Fed meeting
* US heating demand this week to offer little price support
(Updates throughout, previous SINGAPORE)
LONDON, Dec 15 (Reuters) - Oil stayed below $70 a barrel on Tuesday, dipping in its tenth straight session to an 11-week low on persistent worries over hefty stockpiles and sluggish demand.
U.S. crude for January delivery <CLc1> fell 3 cents to $69.48 a barrel by 0845 GMT. London Brent <LCOc1> was unchanged at $71.89.
U.S. crude settled down 36 cents at $69.51 on Monday, its lowest settlement level since Sept. 29. Oil prices fell more than $8 a barrel from Dec. 1-14 in the longest price slide since July 2001.
Traders will wait for a U.S. weekly oil inventory report from the American Petroleum Institute (API) to see if stockpiles continue to rise, and November industrial output figures for clues on the health of the world's largest economy.
Stocks at Cushing, Oklahoma have swelled by 7.8 million barrels in the last six weeks to 33.4 million barrels <USOICC=ECI>, pressuring U.S. crude for near-term delivery as concerns grew over an oil glut in the U.S. Midwest.
The U.S. Federal Reserve's monetary policy decision will also be closely watched. Interest rates are expected to stay unchanged at near zero, but comments will be analysed for clues as to when the Fed might start tightening policy.
MODEST
"We've seen an extremely modest rebound in oil so far, after nine straight sessions of losses, and the downside is still very much intact," said Michelle Kwek, an analyst with Informa Global Markets in Singapore.
"Normally, demand perks up during the winter, but so far, demand has been abnormally weak, and this has been a major concern. We could see oil heading down towards $65," she added.
U.S. heating demand may not provide much price support. The National Weather Service estimated that demand for heating oil in the United States would be about 1.3 percent below normal this week. [
]On the supply side, U.S. crude inventories were expected to have fallen by 2 million barrels last week, according to a preliminary Reuters poll of analysts.
Distillate stocks probably fell 700,000 barrels, while gasoline stocks were seen up by 1.1 million barrels. [
]The U.S. Energy Information Administration (EIA) will release its own inventory figures on Wednesday.
The Organization of the Petroleum Exporting Countries is expected to hold production targets steady at its next meeting on Dec. 22. OPEC has been quietly putting more oil on the market since April, as prices rallied from below $33 a barrel last December.
On a brighter note, economic data due later could show that the U.S. economy is on a slow road to recovery when the Federal Reserve unveils November industrial production and capacity utilisation data at 1415 GMT.
Economists forecast a 0.5 percent increase in output, up from a 0.1 percent rise in October, while capacity utilisation is expected to rise to 71.1 percent from 70.7 percent in October. [
]On Tuesday, the U.S. dollar held steady against a basket of major currencies, while Asian stocks wavered as investors turned cautious ahead of the Fed policy meeting. But Abu Dhabi's decision to throw a lifeline to Dubai continued to bolster risk appetite. [
] (Additional reporting by Jennifer Tan in Singapore, editing by Sue Thomas)