CrazyPhuD

DO some research on oil sites. RP is probably the worst oil out there at doing the only job that matters, protecting your engine according to used oil analysis. The UOA has shown increased wear and shear down to a lower grade oil. They may claim HP gains(which I think is dyno noise), but even if it does it comes at reduced protection to your engine. Does it matter how much HP your engine gains if it siezes?

Engine protection is the job of your oil and I haven't seen results that says it is effective.

hyperpm

i used royal purple diff fluid and it made my diff whine like crap. replaced it with honda and whining disappeared. last time i used royal purple.