Does Too Much Oil Damage an Engine?

Answer

Yes, putting too much oil in your engine can cause damage. Engine damage caused by too little oil is a common concern, but few drivers consider the effects of too much oil. When the oil in your engine is overfilled, the excess oil has nowhere to go. This causes the excess oil to mix with air in your engine and develop a thick, foamy quality. This aerated oil does not lubricate your engine as well as regular oil, which can cause your engine to overheat and parts to become damaged. When excess oil is eventually forced out of the engine, it can cause a failure of some seals and gaskets. If this happens, cars can experience ongoing oil leaks. Also, when excess oil burns off of your engine, it can create noxious, flammable fumes.
Reference:
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