Amsoil vs Mobil 1 test
Amsoil vs Mobil1
You can run what you like but i could feel the difference when i ran Mobil 1 vs Amsoil in my 350z. The motor did not run as fluent through the higher RPMs as to when i changed to Amsoil. Also when i changed my oil i didnt lose a drop so none was burned off like cheaper oils.
I also not only noticed better power gains BUT i noticed better fuel economy. I ran 30mpg on the highway in my 350Z @75mph tests