* German Ifo sentiment up in Oct, helps lift oil
* G20 fin mins meeting on currencies eyed
* Coming Up: CFTC trader position data, 3:30 p.m. EDT Fri (Recasts, updates prices, market activity, changes byline and moves dateline from previous LONDON)
By Robert Gibbons
NEW YORK, Oct 22 (Reuters) - Oil prices edged higher in choppy trading on Friday, supported by positive German business sentiment data as the dollar index seesawed ahead of a G20 finance ministers' decision on currencies.
Investors were eyeing a Group of 20 meeting in South Korea that looked unlikely to reach a deal on a U.S.-led initiative for a commitment from emerging countries to allow their currencies to rise. [
]Failure to reach a deal on currencies in South Korea could weigh further on the dollar, analysts said.
Oil received a lift early from news German business sentiment in October reached its strongest in 3-1/2 years, according to the Munich-based Ifo think tank's business climate index, which indicates growth levels six months ahead. [
]U.S. crude for December <CLc1> delivery rose 40 cents, or 0.5 percent, to $80.96 per barrel by 12:07 p.m. EDT (1607 GMT).
In London, ICE Brent December crude <LCOc1> rose 43 cents, or 0.53 percent, to $82.26 a barrel.
Oil futures slumped on Thursday when the dollar's recovery from an early dip sparked a sell-off as doubts resurfaced about the extent of potential U.S. monetary easing. Data showing slower third-quarter economic growth in China also weighed on oil prices.
"Participants are waiting to see how much money the Fed is going to run off, hoping that it will give a directional cue for the dollar and subsequently oil," Mike Fitzpatrick, vice president at MF Global in New York, said in a note.
Analysts expect U.S. Federal Reserve to take up the question of another round of government debt purchases, or quantitative easing, at its policy meeting on Nov. 2-3.
"The developing currency war and the devaluation war is the single most important factor for the oil market besides maybe the rate of Chinese economic growth," said Eugen Weinberg, commodities analyst at Commerzbank, adding, "the negative correlation is sustainable in the longer term."
The U.S. dollar index <.DXY> was volatile on Friday. An early turn negative helped send U.S. crude futures up over $1 intraday as the greenback's weakness prodded investors into commodities as an alternative to holding cash.
But the index was higher at midday Friday in New York and only slightly stronger versus the euro <EUR=>, also amid choppy trading.
The dollar index was down around 7 percent intraday from September highs and the greenback's weakness fuels interest in oil and other commodities among investors looking for better returns and from holders of cash.
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Graphic on crude oil and gold correlation with the euro:
http://link.reuters.com/cuw79p
Graphic showing oil's technical outlook:
http://link.reuters.com/duw79p
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While currency disputes helped keep markets on edge, the battle in France over pension changes also supported oil futures.
Refinery outages and tanker disruptions in France continued with unions signaling their determination to keep fighting even if President Nicolas Sarkozy's unpopular pension reform becomes law on Friday. [
]STORM THREAT EYED
Sources had mixed views about whether oil was being supported by a threat from Tropical Storm Richard in the Caribbean Sea. The storm was expected to strengthen into a hurricane this weekend and hit Mexico's Yucatan Peninsula on Monday.
After crossing the Yucatan, the remnants of Richard could emerge in Mexico's oil-rich Bay of Campeche and possibly threaten U.S. oil and natural gas production facilities in the northern Gulf of Mexico, the U.S. National Hurricane Center and and some computer weather models forecast. [
]At 3:30 p.m. EDT (1930 GMT) on Friday, investors will receive an update from the Commodity Futures Trading Commission on positions held on the New York Mercantile Exchange by money managers as of last Tuesday. (Additional reporting by Gene Ramos in New York, Emma Farge in London and Alejandro Barbajosa in Singapore; Editing by David Gregorio)