I have used the K&N spin-on filter on my Brute Force...along with several others..and it won't keep the oil from getting "color" as well as the stock Kawasaki filter. The best I found for it was the Puralitor PureOne. If they make one for this...or the Rotax 800, I would at least try it. Not a cheap filter...but neither is the OEM. Filters are not the place to save money anyway.