I run Amsoil in everyone of my 9 vehicles. My 96 dodge ram has 160K on it and burns 0 oil, and runs like new -still getting 14mpg with 3 inch taller than stock tires. I went to Amsoil after 600 miles on the busa and noticed the trans shifting smoother and motor cooler. I put it in my 954RR and thought the clutch was slipping so I installed stiffer springs. Turns out the motor was runner better and was just spinning the rear tire! I have it in my 2005 suzuki eiger 4x4 which is air cooled. The fan fuse blew a LONG time ago and all this summer, the hot light has never came on. I just noticed the fan was not running the other day and my GF tells me she hasn't heard the fan run for a LONG time. I can't say enough good things about this oil. I have run Castrol full Syn and Mobil 1 syn in my past cars and had great results as well. For me, Amsoil forever. (plus they are the first synthetic oil)