How many minutes must the oil level be checked after engine shutdown for the most accurate results?

The accuracy of an oil level check after engine shutdown is influenced by the temperature of the oil and the engine components. After an engine is turned off, it takes some time for the oil to settle and provide a consistent reading on the dipstick or oil measurement system. Checking the oil level after a period of 15 to 20 minutes allows for adequate cooling and ensures that the oil has had sufficient time to drain back into the oil pan from the engine components. This timeframe balances the need for the oil to settle without allowing it to cool down too much, which could lead to an inaccurately low oil reading. This is why the answer specifying 15 to 20 minutes is validated as the most reliable period for checking oil levels accurately.