I have run Rotella, I went with Valvoline 20/50 VR1 just the other day, 70psi on startup warms up drops to 40psi then will go between 50-70psi depending on how much your foot is in it. The Rotella got black in my car after a summer. I think it was probably a tunning issue and not the oil. I run it in my truck and I cant make it black in 4k miles.