Both of those are great oils, and so is german castrol green, the EUROPEAN FORMULA AND ONLY THE EUROPEAN FORMULA. I have gone through way to many threads on supramania to hear the same guy yell at people over and over. I.J. Over on supramania has been a nuclear chemist for over 10 years and has done a religious amount of oil research and whatnot. I listen'd to him and used euro german castrol green. I love it so far, car felt like it revved smoother, oil pressure was better (Not like it was low just doesnt take as long to get the psi up).
To close this up
RedLine
Royal Purple
German Castrol Green (European Formula)
All 100% true synthetics
EDIT: You guys can yell all you want about what i just said too, but im going to listen to a Nuclear Chemist over MOST (99%) of the people on this board.