I'm sure a lot of you have already read this, but I did my own oil testing, since I was tired of all the BS. Long story short, I'll keep using m1.
Also, there was a recent amsoil motorcycle oil study, and m1 just narrowly was beat out by the amsoil product. They were very extensive and tested many of the oils I also tested, and I was damn suprised to find how poorly RP performed - it was right in the middle of the pack.
They also tested both 10w40 and 20w50 viscosities, to cover their bases.
Regardless of the fact that it is published by amsoil, it's valid for comparison and the results were verified by a independent 3rd party. It's a must read.
Charles Navarro, LN Engineering
Aircooled Precision Performance
'99 Boxster powered by Flat 6 Innovations; '10 Cayman S (DFI testbed)