This may sound like a stupid question, but it seems that nearly all synthetics perform well so it is difficult to choose. My MS3 has a very difficult dipstick to read and having a darker oil might make it easier to see. I can't run Royal Purple or Redline because of the SM warranty requirement. I remember Castrol Syntec being almost perfectly clear when I ran it in my Tundra. I'm looking at 5w-30 oils.