I have used Mobile 1 since 1992, I have had the intake manifold off both my 1998 and 2000 GM trucks recently and can say the oil does keep your engine cleaner than any conventional oil I have experienced. I have never seen a used engine as unbelievably clean as these inside. I think all oil will lube the bearings but not worring about sludge is why I pay the premium, just my 2 cents....