what is this rotella, I saw that stuff but its for like diesel trucks or something, is there a bike specific one?
Rotella IS for diesel trucks. 15W40 petro based, or 5W40 synthetic are the ones to use. Do NOT use the 0W40 synthetic one as it has friction modifiers and has been reported to cause clutch slippage on certain bikes.
Although it has been covered in other threads, the "cole's notes" version of the story is that diesel oils have a higher grade base stock of oil versus normal passenger car or motorcycle oils. Also, their resistance to sheer and viscosity retention over the life of the oil makes them an excellent candidate for motorcycle use.
I've been using the 15W40 petro based version and the motor runs beautifully. I have absolutely beautifully and the oil remains clean. No problems to report whatsoever, and the shifting has been crisp and precise. I'll be trying the 5W40 synthetic next, and hopefully it'll be more of the same.