I use it in everything I drive. I over revved a 2V 4.6 real bad one night and noticed a silght knocking that gradually gotten worse. When I tore the engine down all that was damaged was a spun number 8 rod bearing. I saved the rod, crank, and piston and I believe it was due to having Royal Purple in the engine. I think the outcome would have been way worse had it been dinosaur oil. Sythetics just protect way better. Just in case anyones wondering how I over revved it was shifting 2nd to 3rd and missed. stupid I know.