Posted 2/13/2012 01:26 (#2224676 - in reply to #2224319) Subject: Re: oil change intervals on cars
All amsoil studies are performed by the ASTM (American society for the testing of materials) where they test everything from certifying horseback riding helmets, to well, lubricants. I have never seen ASTM results advertised by competing oil companies. That tells me something. You don't have to be an amsoil dealer to appreciate their quality.
oil change intervals on cars
