What are the effects of water in engine oil on the engine?

[Barrett]

Water in engine oil can cause emulsification, reduce the viscosity of the oil, and significantly diminish its lubrication effectiveness. Ultimately, the engine suffers the damage. Water entering the engine is absolutely a fatal internal injury for a car. Once water enters the car engine, at best, the spark plugs may fail to ignite or the engine may stall directly; at worst, it could lead to cylinder explosion. If the engine only mixes with water vapor entering from the air filter, the problem is not serious and can be resolved with simple measures. Just clean the water vapor from the air filter, throttle valve, and cylinder. If a considerable amount of water enters the engine but does not affect normal driving, though the noise may be louder, it may indicate a small amount of water in the engine oil or gasoline. In this case, replacing the engine oil and cleaning the related engine components is necessary. If the engine has already taken in water, rather than just mixed with a lot of water, but the car has not been started and the engine has not been damaged, the water needs to be drained completely, the interior cleaned thoroughly, reassembled, and the engine oil replaced. However, the electrical system may not be entirely safe. Engines are classified into external combustion engines and internal combustion engines. An external combustion engine means its fuel burns outside the engine, while an internal combustion engine means its fuel burns inside the engine.