Oil prices hit 6-1/2-year lows on Monday after Chinese stock markets suffered their biggest one-day fall since the global financial crisis, intensifying worries over the outlook for global oil demand. Inaction by the Chinese government following an 11 percent rout in local stock markets last week encouraged a free-fall in global equities and other commodities on Monday. It’s all about China,” Carsten Fritsch, senior oil analyst at Commerzbank in Frankfurt, told Reuters Global Oil Forum.