After my initial 20 hour service, I'll probably just change mine once a year. I'll probably be close to 100 hours a year on it anyways. Will have to see how much riding I get in. I've got 10 hours on it now and about 100 miles in a week, but took it out every day, won't be riding that much all the time.
Actually its 2 different oils. Dealer said Kawasaki recommends using the wet brake oil in both differentials. Something about they changed the formulation of the wet brake oil so it can be used in both differentials.
Ah! the great oil debate...
20 hrs on the Teryx, sold the last T2 2014, did the 20hrs on that, just sold it with 3200 miles on it, ran like the 1st day I got it, no smoke, no oil usage, and power's past all the yamaha's wolverines, and Vikings, overkill! maybe, but sure will last, some people go 500 miles, have you seen that oil come out, no THX.