What happens if my engine oil is overfilled?

I suspected that my engine oil was running low so instead of bringing it in for an oil change, I let my brother top my engine oil off. The problem is that I think he overfilled the engine oil. What will happen to my car if my engine oil is overfilled?

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Answer provided by
Katherine Duffy
Answered on Apr 21, 2022
I understand—sometimes quick fixes seem like a good idea until you realize later that it caused you more trouble. If your engine oil is overfilled, several parts of your engine may start to malfunction due to improper oil pressure.
An engine that’s been severely overfilled might leak oil or you could see thick gray or blue smoke from the hood while you’re driving. If either of these things happen, bring your car in for service immediately.
Here’s the kinds of damage an engine oil overfill might cause:
  • Critical pressure on crankshaft: Your crankshaft components usually stop leaks from happening, but when your engine oil is overfilled, there’s too much pressure on the crankshaft, which causes a leak.
  • Engine malfunction: Too much oil pressure won’t just damage your crankshaft but can actually cause multiple parts of your engine to malfunction. The parts won’t lubricate effectively, and oil leaks can start happening in different places.
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