Oil leaking in combustion chamber of an engine leads to abnormal combustion of oil and mixture.
2
因混合气过浓、点火系统有故障、发动机内压力损失、冷机等导致的不正常燃烧都会形成气门积炭。
Improper combustion, due to a rich mixture, defective ignition system, loss of compression in the engine, a cold engine, and so forth, will result in carbon deposits on the exhaust valves.
Do not dampen batteries, nor dispose of it in water or it will cause the loss of internal protection and abnormal chemical reaction, and the batteries may overheat, smoke, deform or burn.