amirza786
Senior Member
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- 2022 Polestar 2, 2010 Lexus IS 350 Sport
Manufactures have built into their design an engine oil reserve in cases where someone may accidentally overfill and that oil will expand when heated. If you add a half quart over, there is no harm. More than that, then the oil might reach the crankshaft and it may aerate which causes foaming. So if you fill it up to or near the top fill line, and due to some fuel dilution it raises a little (10cc as and example), that is not a big concern. Now if it raises way beyond the top line, that may indicate a problemyour just trying to pick the lesser of two evils, both are equally bad,
more oil dilution, or an over filled engine
having your oil over filled, is just as bad as under filled,
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