The bike will most certainly work for 4 years with regular maintenance. There are no shortage of sportbikes still on the road from 10 or even 20 years ago.
Seriously though, since you are going to be paying for it for so long, put sliders on it.
As for the sludge, ask your local yammy service manager about it. He’ll be able to tell you better than anyone else what the issue is and how to avoid it. He’ll probably have some other useful advice.
Have fun, keep safe.