Interesting. How many other manuf use Brake fluid in the brakes and hyd fluid in the clutch systems? I've never seen anyone else that does. Seems like for simplicity you'd use the same fluid the other hydraulic system (brakes) uses.
BMW used Brake fluid in the clutch system until about 2005 or so. Depends a little on the model. A little later on the in line LT I think. Then they went to mineral oil.
My other bike is a BMW.
Jack Hawley MOA and RA #224, KE9UW ("Chuck")