X2. The hydraulic oil is needed for wet brake applications. I thought I had heard that the kodiak has a wet rear brake, but grizz is 4whl disc. It should not need hydraulic oil.Kawasaki Wet brake stuff is a Tractor TDH type oil. I owned 4 kawis and I used to buy the TDH from Walmart for $9 for a gallon, beats $12 per quart at the Kawi dealer..
My Yamaha grizzly 700 got 75/90 Synthetic.
I would guess the Kodiak with its sealed wet brake needs the TDH fluid.