Can the engine be washed with a water gun?

[VonMatteo]

Engine can be washed with a water gun. It is better not to use a water gun to wash the engine in the following situations: 1. Hot engine state: According to the principle of thermal expansion and contraction, using cold water high-pressure washing when the engine is hot will cause the engine temperature to drop sharply, which may cause oil seal leakage, and in severe cases, cylinder block rupture may occur. 2. Older cars: When cleaning the engine compartment of a new car, a high-pressure water gun can be used, but for cars that have been used for too long, although the engine compartment is insulated, there is no guarantee that it will not cause a short circuit. It is best to ask the 4S shop master to blow it with an air gun during maintenance.