NEW YORK, Sept 30 (Reuters) - U.S. crude oil futures slipped in seesaw trading on Wednesday ahead of government inventory data and with end-of-quarter trading and October refined products contract expirations also factors. Wall Street and crude futures fell back on news the Institute for Supply Management-Chicago business barometer fell to 46.1 in September from 50.0 in August. [ID:nN3095624] Earlier, a weaker dollar and manufacturing data from China and Japan were cited by sources as helping send crude up near $68 a barrel. The dollar fell against most major currencies. [USD/] Oil markets were being cautious after the American Petroleum Institute said late on Tuesday that U.S. commercial crude oil inventories rose a more-than-expected 2.8 million barrels last week. [ID:nN29168935] Distillate stocks rose 2.3 million barrels, while gasoline supplies fell 1.7 million barrels. The U.S. Energy Information Administration will release its oil inventory data at 10:30 a.m. EDT (1430 GMT). A Reuters survey of analysts yielded a forecast for crude supplies to be up a modest 600,000 barrels, with distillate supplies expected to be up 1.2 million barrels and gasoline up 1.0 million barrels. [EIA/S] Also in focus on Wednesday is the expiration of NYMEX October refined products contracts. PRICES * On the New York Mercantile Exchange, at 10:03 a.m EDT (1403 GMT), November crude CLX9 was down 11 cents, or 0.15 percent, at $66.61 a barrel, trading from $66.22 to $67.99. * In London, November Brent crude LCOX9 was down 16 cents, or 0.24 percent, to $65.33 a barrel, trading from $65.00 to $66.67. * NYMEX October RBOB RBV9 rose 0.48 cents, or 0.29 percent, to $1.6329 a gallon, trading from $1.6301 to $1.6650. * NYMEX October heating oil HOV9 fell 0.86 cent, or 0.51 percent, to $1.6920 a gallon, trading from $1.6861 to $1.7227. * The November/November RBOB crack spread <0#RB-CL=R> was at $2.45, after ending at $2.22 on Tuesday. The November/November heating oil crack spread <0#CL-HO=R> was at $5.62, after ending at $5.81 on Tuesday. * The spread between the current front month and the five-year forward crude contract CLc61 was at $15.09, based on the November 2014 contract Tuesday settlement at $81.70. The spread ended Tuesday at $14.99. TECHNICALS NYMEX crude 10-day/20-day moving average: $68.76/$69.38 Technical support/resistance: NYMEX crude: $65.05/$68.45 NYMEX heating oil: $1.6495/$1.7790 NYMEX RBOB: $1.5740/$1.7050 For a full report on technicals, click on [ID:nLU120709] MARKET NEWS * The U.S. economy contracted at a slower pace than previously thought in the second quarter, but there was a decline in private payrolls in September. [ID:nN30198553] * Chinese factories ramped up output and jobs in September to meet increased orders, though HSBC's China Purchasing Managers' Index eased in August. [ID:nPEK60937] * Japanese industrial output rose in August but the pace of increase slowed for the fourth straight month and manufacturers expect a further slowdown in September. [ID:nT351414] * China's crude oil stocks climbed in August versus July, to stand at a new record high, an industry newsletter reported on Wednesday. [ID:nPEK75903] * Iran said on Wednesday it viewed talks with six world powers an "opportunity and a test", while the United States weighed sanctions.

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