OEM and aftermarket for these engines (not the trucks) is great in some areas still. Regulation has killed a lot, but for now it's still fine, spendy, but fine. Yup i ground it down, treated it, and sealed it, but some spots were too thin to grind out so there is only so much I can do for now. And then there is always - well it's a worn 270k mile engine and still had plenty of original parts on it, how much is going to need replacing if I pull it. Then I might as well do a full rebuild on it XD