Wow, I was surprised to see R/P that far back on the graph. I have used all kinds of oils over the years. When I tear down, all the bearing and other contact surfaces have always looked way better using R/P. I have never used the really high priced oils because I felt there was no need to due to the facts that I held in my hand looking at. I may give a few of the other oils a try to see if the motor likes them a little better, (engine noise and performance). I do trust R/P at the end of the day tho.