I followed the break-in procedure in the owner's manual religiously. After the 600 mile break-in, I immediately switched to Amsoil 15W-50. This weight of oil is allowed in the owner's manual for riding over 32 degrees (I can't imagine riding a bike when it's that cold!). The shifting is 10X better! Kawasaki has a positive neutral finder which makes it easier to find neutral at a stop light, but it sucks for the 1st to 2nd upshift. I missed 2nd gear several times with the factory fill, but not once with the Amsoil. Every shift is butter smooth! I can't speak to the operating temperature because I broke it in on low-power mode and was very gentle on it. Switched to Amsoil and went to full-power mode and switched traction control to the least intrusive. Even riding in 90+ heat, my temp was good and I know the motor and gearbox are protected. I've got 120 pounds of torque and I've read that the shearing aspect of the transmission is really rough on oil; I trust Amsoil. I use it in my turbo car, which is also rough on oil, and it's great! Give it a try, you won't be disappointed. I work hard and my toys aren't cheap, I trust Amsoil to protect them. Loyal customer!