Summary

       Mixed Chinese data, possibly weaker winter demand weigh API shows crude, gasoline stock fall -market sources Coming up: EIA data on U.S. crude stocks at 11 a.m. EDT

       LONDON, Sept 7 (Reuters) - Oil prices eased on Thursday as an uncertain economic outlook for China outweighed expectations of tighter supplies from extended supply cuts in Saudi Arabia and Russia.

       Brent crude futures fell 18 cents, or 0.2%, to $90.42 a barrel by 1323 GMT, while U.S. West Texas Intermediate crude (WTI) futures fell 21 cents, or 0.2% to $87.33.

       Both benchmarks had spiked earlier in the week after Saudi Arabia and Russia, the world's top two oil exporters, extended voluntary supply cuts to the year-end. These were on top of the April cuts agreed by several OPEC+ producers running to the end of 2024.

       Market participants also digested mixed data from China. Overall exports fell 8.8% in August year on year and imports contracted 7.3%. But crude imports surged 30.9%.

       "The wind has been taken out of the bulls' sail overnight by rising Chinese product exports last month albeit crude oil imports rose," PVM Oil analyst Tamas Varga said.

       Concerns about rising oil output from Iran and Venezuela, which could balance out a portion on cuts from Saudi and Russia, kept a lid on the market as well.

       "At present, it is really difficult for us to see any negative factors due to supply constraints," said CMC Markets' Shanghai-based analyst Leon Li.

       "However, we need to consider possible demand risks such as in the fourth quarter, the market could slow into an off peak season for oil consumption after summer demand ends."

       Helping support prices, U.S. crude oil inventories were projected to have fallen by 5.5 million barrels in the week ending Sept. 1, according to market sources citing American Petroleum Institute figures.

       Official inventory data from the U.S. Energy Information Administration is due at 11 a.m. EDT (1500 GMT) on Thursday.

       Additional reporting by Trixie Yap in Singapore Editing by Jason Neely and Frances Kerry

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