I keep reading about these seal "conditioners" that slow or stop leaks. But what In getting out of that is it's some sort of seal sweller. Sure it may stop a leak, but wont it also increase the pressure against the mating surfaces of all the other seals in the engine, causing them to have some sort of premature failure too? Or am I totally off base here? I've also read a handful of posts stating something along the lines if "if you haven't used high mileage oil don't start"