E eddyzima Joined Jul 30, 2004 Messages 166 Location western pa Aug 20, 2004 #1 what is the difference in sl and sm ? i see the castrol gtx at autozone now states sm on the back. is it an epa thing or is it truely better?
what is the difference in sl and sm ? i see the castrol gtx at autozone now states sm on the back. is it an epa thing or is it truely better?
