Crude oil futures extended their weakness on Tuesday ahead of weekly inventory data which is expected to show crude oil supplies fell for a second-straight week, amid concerns that the sharp uptick in crude prices could encourage US shale producers to ramp up production. Also, the advent of autumn is traditionally associated with weaker oil demand as it marks the end of the summer driving season. 

Meanwhile, OPEC Secretary-General Mohammad Barkindo said that compliance with the oil output cut deal between OPEC and non-OPEC nations is extremely high. Barkindo said compliance was high, but at 86% last month, the cartel will simply need to get more nations to fully commit.

Benchmark crude oil futures for November delivery ended lower by $0.16 or 0.3 percent at $50.42 a barrel on the New York Mercantile Exchange. Brent crude for November delivery lost 0.15 cents to $55.97 a barrel on the ICE.

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