awm, I dont know that you're wrong in going with Mobil 1. Lots of folks here have and are pleased with it. My research showed that Amsoil was the best available, especially when combined with their bypass filter, so I'm gonna give it a try. Eric, There aren't any Dixie Chopper dealers around here, but I'm gonna get my mechanic to set it up for me. I want to see if the Amsoil lowers my operating temperature, but I dont have a temp. gauge on my Scag. Maybe I could get one of those infared temp. guns for $100 and find out. It seems I remember that you commented one time about the operatin temp. lowering on your DC. Do you have a temp. gauge?