while i was looking through the manual, it say's it should be done through a an authourized kawasaki dealer, am i missing something here, it can't be that hard of a job, drain the oil via the sump plug, remove the filter, refit the new filter, refit the oil drain bolt with a new washer, then apply the new oil, 4.4L with the filter removed then check for leak's.
That's the correct process, but if you don't follow the manual then Kawasaki won't make any money.
Ask any independent garage. Too many stripped sump plug threads and overtightened filters by incompetent owners all trying it on for warranty claims