Originally Posted By: KCJeep
A few ppm is nothing at all, especially on such a young engine. Looks like they both worked quite well actually.
Agreed. I know Amsoil would give it a long life. The Pennzoil is cheaper, and easier to get, and it makes my particular engine quieter so that will be what it gets for now. I would use Pennzoil Ultra, but we all know it only exist in Internet Pictures, and not actual store shelves.