I changed the oil in both finals 250hrs ago. This was the first SOS tests I've done on machine. What bothers me is that I don't really run it in mud or water. Soft wet conditions, yes. When I pulled the plug last time and drained the fluid, there was a tiny, tiny bit of stuff on the magnet, but no more than on the left side. Nothing to cause alarm. As for external leaks, its pretty tight, except for a minor engine oil leak thats going to be taken care of soon. When I pulled the add plug one the final, the fluid was right at the top. The oil I used was the cat 50W TO-4 stuff.
This is what the machine is used for 85% of the time.
http://youtu.be/Zd3mkFxNTNM
Sounds like a plan then. I'll do as you guys say, and run it, drain it, flush with some hydraulic oil, and fill it back up and run her to 125 hrs. Kinda sucks is that I'm heading into my slow season.