Originally Posted By: digitalSniperX1
In my case it's a 2014 Kawasaki zx14r. 15w40 felt fine (shell) and 15w50 (m1) shifts fine. 10w40 m1 high mileage however is pretty darn notchy. I just changed it and may dump it for other use.
Why the Mobil 1 HM oil in the ZX14r ?
My KZ 1000 shifts the same no matter what oil is used. Haven't had my Concours 14 long enough but it's been the same shift wise on M1 4T 10W-40, M1 V-Twin, M1 15W-50, Rotella 15W-40.
Like you, I would also like to know what would make shifting change between brands/types of oil.