* Euro zone debt contagion risk helps pressure commodities
* Dollar index bounces, euro retreats, pressuring oil
* Coming up: API oil inventory data, 4:30 p.m. EST Tuesday (Recasts, updates with settlement prices and market activity)
By Robert Gibbons
NEW YORK, Nov 22 (Reuters) - Oil prices fell on Monday in choppy trading, pressured by a stronger dollar that bounced as optimism over a debt bailout for Ireland gave way to concerns that financial problems would spread to other euro zone countries.
U.S. gasoline futures added to the pressure on crude oil prices, slumping amid expectations that refinery restarts and imports from Europe will relieve tight supplies in the New York Harbor region, the delivery point for the U.S. gasoline futures contract.
U.S. crude for January delivery <CLc1> fell 24 cents to settle at $81.74 a barrel.
Prices jumped to $82.87 early, before the dollar rallied and helped push them as low as $80.68. Brokers and analysts noted that support is expected at the January contract's $80.65 low from last week set before January took over the front-month position when the December contract expired on Friday.
In London, ICE January Brent crude <LCOc1> fell 38 cents to settle at $83.96 a barrel.
"Crude oil is down in reaction to the dollar, which is firmer," said Phil Flynn, analyst at PFGBest Research in Chicago.
"There is concern about contagion in the euro zone, and that's keeping the market on edge. But volume is light ahead of the Thanksgiving holiday."
Total crude oil trading volume was around 412,000 contracts with less than an hour left of post-settlement trading, about 37 percent below the 30-day average.
The euro slumped against the dollar as worries about how a financial bailout for Ireland will be implemented curbed initial optimism, prompting a euro retreat from a one-week high reached earlier in the session on news of the rescue deal.
The European Union and International Monetary Fund agreed on Sunday to help bail out Ireland with loans to tackle its banking and budget crisis after the country formally requested aid. The deal is expected to total 80 billion to 90 billion euros ($109.8-$123.6 billion). [
]A stronger dollar typically pressures oil and commodities prices as it caps investor appetite for riskier assets and makes dollar-denominated oil more expensive for consumers buying with other currencies.
In addition to the problems in Europe that could threaten oil demand, oil investors remain cautious amid concerns China will do more to cool inflation even after last week's increases in bank reserve requirements. [
]"There are also views that the bank reserve hikes, which China has introduced recently, are not enough to curb inflation," the Mizuho Corporate Bank said in a research note.
Copper prices fell on lower imports from top metals consumer China and on the Irish bailout fluctuations [
] and U.S. equities felt pressure from the turmoil of the Irish bailout deal. [ ]U.S. GASOLINE EXTENDS SLUMP
U.S. gasoline futures prices <RBc1> extended their slump from Friday, ending 2 percent lower on refinery restarts [
] in the U.S. Northeast.Gasoline futures rose 3 percent last Thursday, a jump attributed to the unexpectedly large drop in gasoline stocks in the week to Nov. 12 reported by the government [
] that added to concerns about tight supplies in the New York Harbor.Also tempering gasoline prices were expectations that imports to the region will be revived now that the recent French port and refinery strikes are over.
EYEING SAUDI ARABIA
A Saudi oil industry official told Reuters on Monday that $80 per barrel was a good price for oil under current market conditions. [
]The remarks were in line with those earlier this month from Saudi Oil Minister Ali al-Naimi, who said prices between $70 and $90 a barrel were comfortable for consumers, a shift from previous remarks stating $70-$80 was the ideal range.
Elderly King Abdullah of Saudi Arabia flew to the United States on Monday for medical checks for a back ailment, and Crown Prince Sultan returned from a holiday abroad. [
] Oil investors closely monitor such developments in the world's top oil exporting nation. (Additional reporting by Gene Ramos in New York, Ikuko Kurahone in London, Florence Tan and Luke Pachymuthu in Singapore)