* U.S. consumer sentiment drops to weakest since Aug 2009
* Enbridge Canada-U.S. pipeline restarted Friday morning
* Coming up: CFTC positions data at 3:30 p.m. EDT Friday
(Recasts, updates with U.S. settlement prices, market activity)
By Robert Gibbons
NEW YORK, Sept 17 (Reuters) - Crude oil prices fell a fourth straight session on Friday after U.S. consumer sentiment data showed a surprise drop to the weakest level in more than a year.
U.S. consumer sentiment unexpectedly worsened to its weakest level since August 2009, as distress over jobs and finances intensified among upper-income families, the Thomson Reuters/University of Michigan preliminary September reading showed. [
]U.S. crude futures ended with its worst percentage weekly loss in five weeks after being pummeled earlier in the week by the expected restart of a major crude pipeline from Canada into the United States.
U.S. crude for October <CLc1> delivery fell 91 cents, or 1.22 percent, to settle at $73.66 per barrel, trading from $72.75 to $75.25. The October contract expires on Tuesday.
For the week, front-month U.S. crude prices fell $2.79, or 3.65 percent.
U.S. November crude <CLX0> fell 82 cents, or 1.08 percent, to settle at $74.63 a barrel.
ICE Brent for November <LCOc1> fell 37 cents to $78.11 at 2:43 p.m. EDT (1843 GMT). October Brent expired on Wednesday.
"The consumer sentiment report came out and the dollar strengthened, piling on after the expectation that Enbridge would restart its pipeline had already taken the steam out of front-month crude earlier in the week," Chris Dillman, analyst, Tradition Energy in Stamford, Connecticut.
The dollar rallied against the euro and the yen as European debt concerns and the weak U.S. consumer data eased risk appetite. [
]A stronger dollar can pressure oil prices because it makes dollar-denominated oil more expensive for buyers using other currencies, increases the value of the currency being paid producers and cause investors to move money from commodities to foreign exchange markets, chasing better returns.
U.S. regulators and the company confirmed on Friday the restart of Enbridge Inc's <ENB.TO> Line 6A pipeline, which carries up to a third of Canada's U.S.-bound crude oil shipments. [
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Take a Look-Enbridge crude line to reopen [
]For a map: http://link.reuters.com/mes92p
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U.S. crude prices have been range bound much of this year but spiked to a one-month high after last week's closure of the Line 6A pipeline that brings Canadian crude to U.S. Midwest refineries and the key Cushing, Oklahoma, oil hub.
A longer pipeline shutdown could have started to drain U.S. stockpiles that remain well above year-ago levels, according to the U.S. Energy Information Administration. Stocks stood at 357 million barrels in the week to Sept. 10, 24.6 million above the same week in 2009. [
]Though the oil market has spent much of the year in lock-step with U.S. equities, stock markets were little changed in choppy trading as the report on consumer sentiment weighed on Wall Street, while solid earnings from technology bellwethers Oracle and Research In Motion provided support. [
]Also easing concerns about supply disruptions, Hurricane Karl hit Mexico's central Gulf Coast on Friday, but it appeared to have spared Mexican offshore oil operations from major damage. [
]Oil prices seemed to receive little support from a report by investment bank Goldman Sachs that said commodities, like oil, which follow a cyclical trend, have upside potential. [
]"We believe that near-to-medium term fundamentals remain most constructive for crude oil, copper, platinum and corn, with short-term risk/reward looking the best for crude oil," Goldman said in a research note.
For more cyclical commodities, there have been strengthening economic data and hints of tightening fundamentals and Goldman said it continued to expect them "to break out to the upside in coming months." (Additional reporting by Gene Ramos in New York, Marie-Louise Gumuchian in London and Alejandro Barbajosa in Singapore; Editing by Marguerita Choy)