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Overfilling your car with engine oil is very unadvisable. If the oil is only slightly overfilled the engine will likely not have any problems, but overfilling by more than 1/2 quart or so (depending on the oil capacity of the engine) can result in several problems. The oil will be aerated by the excessive agitation caused by constant contact with the rotating components inside the engine, which can cause engine failures. Also, if drastically overfilled the oil will likely be sucked into the intake system possibly causing "hydrolocking" which will damage the engine. Hydrolocking is unlikely, and since it is relatively simple to remove oil from the engine there is no good reason to operate the engine while over-filled with oil.

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Q: What if you overfill with oil?
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