Oct 10, 2009 / GM Oil Life Monitor #71 S sw03 Veteran Member Joined Aug 7, 2008 Messages 1,002 GM OLM is really very smart if you know how they designed it etc. Is it 100%, no but the best out there. I still use Amsoil and drain all my auto (1) a year...that is with years of UOA to back it up.
GM OLM is really very smart if you know how they designed it etc. Is it 100%, no but the best out there. I still use Amsoil and drain all my auto (1) a year...that is with years of UOA to back it up.
