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Originally Posted by Citwit
Could REDDYZ explain what problems are caused by slightly overfilling an engine with oil. I have been guilty of that one.
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Depending on how much you overfill, the pressure will be increased and it effects seals and oil rings. Eventually if its an old engine, oil gets into combustion chamber and starts to burn. Too much pressure can effect head gasket too. New engines should cope slight overfill however its better to avoid as engines are not designed to hold extra oil. Fitting large sump and large oil filter (not sure about the pump though) would compensate this which actually increases the oil change intervals. But why would you want to carry more oil, means more weight.
Also excessive oil creates air bubbles in the engine which is not good for lubrication and might be hard to believe but if you put too much oil that could blow the engine.
cheers
Yogi