Buick is mostly in business because of China, the leading buy of that GM model, and the No. 2 economy has long beat the U.S. as the global auto market to be in.

FORBES: China Beating U.S. In VW Luxury Vehicles Market

Sinopec, one of China's largest state-controlled firms, is mostly a refiner, but that business is tough in China because the government keeps consumer fuel prices low, pressuring profit margins.

WSJ: China Foothold in U.S. Energy