In my mind, mileage doesn’t matter. Yes if you have leaks with petroleum based oil they will not get any better and might get worse with synthetic. Aside from that, better lubrication is better lubrication. Why not take steps to slow whatever wear on moving parts will happen in the future? I mean, if you’re dry palming it and suddenly remember you have vaseline do you say “naw, I’ve been rubbing it raw thus far it won’t feel any better to lube up now.”? No, you don’t. Same goes for your engine.
:lol: