* China bank reserve hike pressures commodities, equities
* Gasoline futures correct after surge, weigh on crude
* Coming up: API oil inventory data on Tuesday
(Recasts, updates with settlement prices, market activity)
By Robert Gibbons
NEW YORK, Nov 19 (Reuters) - U.S. oil prices fell on Friday and logged their biggest weekly percentage decline since August after China raised bank reserve requirements a second time in two weeks as the No. 2 oil consumer tries to curb inflation.
The People's Bank of China said that it would increase banks' required reserves by 50 basis points, a less aggressive move than the interest rate rise that many had speculated could occur as soon as this week. [
]The expiring U.S. crude contract for December delivery <CLc1> fell 34 cents to settle at $81.51 a barrel, down 3.97 percent on the week, a second straight weekly decline and the biggest percentage decline since the week to Aug. 13.
U.S. January crude <CLc2> fell 44 cents to settle at $81.98 a barrel.
Total U.S. crude trading volume was just above half million lots traded with less than an hour of post-settlement trading left on Friday. That was 24 percent below the 30-day average.
In London, ICE front-month January Brent crude <LCOc1> fell 71 cents to settle at $84.34 a barrel.
"December crude (found) support above $80 and January around $81. The bearish news of China's reserve move may have been already priced in. I don't think anybody's in shock," said Phil Flynn, analyst at PFGBest Research in Chicago.
The premium of ICE Brent to U.S. crude <CL-LCO1=R> rose to its highest since Sept. 30 on Friday as inventories at the Cushing, Oklahoma, hub, delivery point for the New York Mercantile Exchange's light sweet crude contract, increased last week and as North Sea crude output fell. [
]Brent's premium may expand further amid a pickup in militant action in Nigeria, where Royal Dutch Shell Plc <RDSa.L> declared force majeure on Bonny Light oil exports after a pipeline was damaged. [
]Attention remained on the prospect that debt-ridden Ireland will obtain a bailout loan from the European Union and the IMF to shore up its banks. [
]The euro rose broadly on Friday, gaining a third straight day versus the dollar, as investors grew more confident that Ireland's debt crisis would be resolved. [
]The dollar index <.DXY> weakened slightly and the weak dollar and the Nigeria force majeure were cited by analysts as helping limit oil's losses.
U.S. GASOLINE PULLS BACK
U.S. gasoline futures prices <RBc1> also fell on Friday, helping pressure the oil complex after jumping more than 3 percent on Thursday.
Traders and analysts said the buying seen on Thursday due to a perceived tight supply situation in the New York Harbor, delivery point for the NYMEX gasoline contract, has subsided.
Gasoline futures were lifted by the unexpectedly large drop in gasoline stocks reported by the government on Wednesday [
], adding to concerns about supply in the New York HarborGasoline prices may also be fueled by an expected pickup in demand. In a report on Friday, industry group the American Petroleum Institute said that U.S. demand for crude oil and petroleum products rose 1.3 percent in October from a year ago, as economic recovery prompted higher fuel consumption. [
]Late on Friday, after oil's price settlements, the government reported that money managers cut net long crude oil positions on the NYMEX in the week to Nov. 16, from record high levels the previous period.
Money managers slightly reduced their net long positions in heating oil while raising them for gasoline, according to the report from the U.S. Commodity Futures Trading Commission. (Additional reporting by Gene Ramos in New York, Zaida Espana and Isabel Coles in London and Osamu Tsukimori in Tokyo)