Changed oil in bike today @ 2200 miles and took sample for an oil analysis, however.... i doubt i'm even going to waste the money to compare the two because switching to amsoil was an instant and obvious difference. Previously used rotella t6 since it's a cheap synthetic that tests well and is highly regarded with cycles, plus..... it's a honda, you can fill a honda with old fish grease and it'll be ok.
@ 2200 miles on an oil change, 75% highway and in a less than two month time span, the rotella was black as coal. Not surprised by that, you're not suppose to get long intervals on rotella, it wore out when it was suppose to wear out. The rotella performed within expectations, bike ran good, stayed right at temperature, and had a small amount of shifter clunk, mostly on down shifting. It was nothing beyond the realm of expectation though.
Switched to Amsoil yesterday and didnt really ride the bike until today. About 10 minutes from my house, my reaction was "omg". The difference is night and day. Everything smoother, idles better, low rpm is better, shifting is silent and silky smooth. unbelievable difference. Especially since the change was from a good oil to begin with. Even as someone who already recognizes that oils are not created equal, i didnt expect this dramatic of a difference between oils. Based on the clutch benefit alone, i'm gonna stick with amsoil. The rotella was "good enough", but amsoil difference is amazing.
Amsoil is the best. I already knew it, but this reconfirmed it.
Yamalube, silkolene, repsol, royal purple, motul.... fuck those oils.