After I broke in the motor I switched to Amsoil and won't use anything else now. I'm pay approx $8.00 a quart. I also use Amsoil in my atv's. I only change my oil twice a year..the begining of the riding season (April) and the end of the season (aprrox November..Ohio weather) and everything runs great. Getting ready to switch my truck over to Amsoil once I use up all my V-oline.