CNBC | Oil down more than 4% on China data, OPEC uncertainty CNBC Oil fell as much as 4 percent on Monday as weak economic data from China, the world's largest energy consumer, weighed on prices and an OPEC source played down talk of an emergency meeting to stem the decline. China's manufacturing sector ... The Science (Or Art) Of Forecasting Oil Prices Oil falls 4 percent on China data, fading prospect of OPEC action MarketsHedge funds cut back on short oil positions |