... of engine, incomplete combustion of gas, increase of carbon deposits and nonconforming tail gas, etc. While on the other hand, too ... of engine; furthermore, piston, piston ring, connecting rod and crank axle would be damaged, and as a result, the cars wouldn’t work ... many cars produced by Volkswagen AG., China FAW Group Corporation and Shanghai Volkswagen Co., Ltd., such as Audi, Passat, Santana, Red ...