Well done a little checking today and made a call to the Klotz company. I asked them what made amsoil so great , ( hehe) and to my suprise they said they would not down grade amsoil , but that Klotz was a better oil than amsoil. I also asked why DA recomened amsoil and not klotz. The bottom line was that amsoil sponsored DA. Also he said that klotz also sponsors company's and that they do the same in oil recomendations. Makes sense to me. It all comes back to that ford chevy thing !!! They will all work just make your choice and stick with it!!

Chad