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Maintenance Minute: When Is it Best to Check Engine Oil?
If your engine is cold, you can check the oil level right away. In this case, the oil will have had time to settle back into the sump. Just make sure the vehicle is level before you do. If the engine is hot, then you should wait for 30 minutes or so to let as much oil as possible drain back into the sump. Checking an engine first thing in the morning is ideal.