Should the car engine oil dipstick be checked when the engine is cold or hot?

[LenaRose]

Car engine oil dipstick should be checked when the engine is cold. Checking when cold prevents oil splashing and avoids burns. When measuring in a hot state, since some oil has not yet settled back, the measured oil level will be slightly lower. When the engine is hot, oil is pumped by the oil pump to parts such as the engine transmission, causing the oil level in the oil tank to drop. The engine oil dipstick is a commonly used control ruler for checking the lubricating oil reservoir level. Since the dipstick insertion hole has a curved path, the dipstick must be able to rebound and restore its shape when pulled out after insertion.