RP fluids are very good. I have ran them in my vehicles for years with excellent results. My F150 5.0 has over 218k miles and runs strong, ran RP oil since first oil change. My car runs great with RP in it.
When I switched over to RP from Mobil 1 ESP in my ZL1, I could even here the lifters quiet down when the RP flowed up to them!
