Gary-Mike said:
Check out this link. Very in depth (but easy to undestand) test results for motorcycle oil. I have changed my belief that Royal purple is the way to go.
http://www.amsoil.com/lit/g2156.pdf
Yep, that's certainly an unbiased opinion in that report --- NOT!!!!
Honestly, just run what you want and if it gives you the performance you are looking for then ignore all the internet bluster. If it doesn't, then try something else. Nothing you put in the crankcase that's a motorcycle rated multi-viscosity oil is going to cause any harm, some just work better than others.
My dealer has people running Mobil 1, Scamsoil, Castrol and Victory oil in Visions and there are no reported problems. Each seems to be happy with the oil of their choice.
I'd have no fear running Mobil 1, Scamsoil, Royal Purple, Red Line, Victory, Castrol, Motul, or any of the top shelf blends out there in 20W-40 or 20W-50 flavors.