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Re: What's Different in High-Mileage Oil?
Posted to Castrol Forum on 5/15/2018

So exactly what "seals" are we expanding to prevent leaks? On an all aluminum engine, typically the oil pan and timing cover are sealed with a bonding agent rather than a gasket. The head gaskets are MLM. That leaves the crank seals and valve cover gasket that... Login to read more.