I really didnt notice a difference in the RP or Mobil. I dont use either since Ive had 2 motors die using mobil1 synth in them. Both were NOT highly modified cars and both had oil failure issues.
I like Redline Oil if you can afford it or Pennzoil dino oil and change it regularly.
well yea penzzoil is good 2 but oil failer well sound lik oil pump... stock and beatin on it all day lik if u at the track will mak it go u didnt hav a baffled oil pump so u was probably sucking air at sumpoint