Royal Purple Motor Oil delivers superior protection and improves performance in four-cycle gasoline and diesel engines. It increases horsepower and torque, saves fuels and reduces heat, wear and emissions. It has unsurpassed oxidation stability that allows for extended oil drains and fewer oil changes, which saves you time and money and reduces the impact on the environment.
What we say:
Amsoil beat this competitor hands down on all test ..Check out any of these test that are listed to the right then click on the charts,you will find that Amsoil has out performance all including Royal Purple products