Can the engine be washed with a water gun?

[TheoLynn]

Can the engine be washed with a water gun. It is best not to wash with a water gun in the following situations: Hot car state: The principle of thermal expansion and contraction, in the case of a hot car, high-pressure washing with cold water will cause the engine temperature to drop sharply, which may cause oil seal leakage, and in severe cases, cylinder block rupture may occur. 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 a long time, 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.