That might be it, it crossed my mind. I've been an Amsoil dealer for about 10 yrs. I only sale to family and friends at cost though. Not trying to make any money off of it. It's real noticeable though that its in MDS much much more. Wasn't sure if anyone else noticed this after switching or not.
Originally Posted by bighemi04
It probably has to do with your engine having to work just a little less hard due to the high quality of the oil. Being an Amsoil dealier I hear a lot about people noticing their idle and running RPM's dropping after they switch.