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Operations Inside A KazMunaiGas National Co. Oil Refinery
A worker walks along the top of a tank wagon as it is filled with petroleum ahead of shipping by rail at the Atyrau oil refinery, operated by KazMunaiGas National Co., in Atyrau, Kazakhstan, on Thursday, July 2, 2015. Kazakhstan is the former Soviet Union's second-largest oil producer.
Bloomberg via Getty Images

Oil prices lurched 5% lower on Monday to their lowest since January, taking global benchmark Brent below $50 a barrel as weak factory activity in China deepened a commodity-wide rout.

Growing concerns over excess global oil supplies, heavy selling in pumped-up gasoline futures and technically driven momentum trading knocked prices to within a few dollars of the six-year lows touched at the start of this year.

U.S. crude had already fallen 21% in July, its worst month since 2008 amid mounting evidence of an expanding global glut and a stock market collapse in China, the world's largest energy consumer.

On Monday, the rout deepened after data showed Chinese manufacturing growth unexpectedly stalled in July and U.S. consumer spending advanced at its slowest pace in four months in June as demand for automobiles softened.

Brent, the global benchmark for crude, settled down $2.69, or 5.2%, at $49.52 a barrel. Brent's session bottom of $49.36 was within striking range of its 2015 low of $49.19.

U.S. crude settled down $1.95, or 4.1%, at $45.17, just about $3 above its 2015 bottom.

"Economic weakness has set the tone," said Matt Smith, director of commodity research at ClipperData, a New York-based energy database.

"But the gasoline crack spread is also unraveling," Smith said, referring to the difference between gasoline and U.S. crude prices, which sets the profit margin for refiners.

Gasoline's front-month continuation contract settled down almost 9% from Friday's close, its most in a day since October 2012, Reuters data showed. The gasoline crack, or spread with U.S. crude, narrowed to below $26, its lowest in more than a week.

"The chart is looking anything but constructive," said Fawad Razaqzada, technical analyst in London for, who expects both benchmarks to set new lows for the year soon.

Oil hasn't been falling alone. The 19-commodity Thomson Reuters/Core Commodity CRB Index, a global benchmark, hit its lowest since 2003, erasing almost all the gains of the decade-long commodities "super-cycle" fueled by China.

A Reuters survey last week showed oil output by the Organization of the Petroleum Exporting Countries (OPEC) reached the highest monthly level in recent history in July, reinforcing the idea that Saudi Arabia and other key OPEC members are focused on defending market share.

Hedge funds and other speculators have cut their bullish exposure to U.S. crude to a near 5-year low, trade data showed on Friday, as local drillers added rigs and pumped at full throttle despite the global oil glut.

Large investors in Brent also cut their holdings last week by the most in percentage terms since September 2014.

--Additional reporting by Amanda Cooper in London and Florence Tan in Singapore