Yes, both UNI and K&N filters require oil to trap dirt/dust. The oil you use is general different for foam vs paper/gauze filters but there are many different types available.Do you need to put oil on both of these? I read up on the K&T and it doesn't say anything about putting oil on it.
I don't know about cleaning it so often. Even K&N will tell you their filters work better after they get a little dirty and I believe tests have proven that not only is that correct but that they are also more prone to passing dust when they are clean vs dirty. Sounds to me like they actually use the dirt as another air filtering media. That's my gripe with K&N. I like a clean filter but they essentially want me to leave it dirty up to a certain point. Doesn't work for me.I've ran both on my sport & race quads - never had an issue with either but I always ran a outerwear on the K&N. With the Maverick & Commanders you can't run the outerwear or at least I haven't seen one. I had such bad dust issues with my stock air filters in my Commander, I switched to K&N and never had any more problems but I would clean it pretty much after every dusty trip too. So far running the K&N in the dunes has been good in the Mav, no signs off dirt getting past filter. I do think I will get a UNI for when we ride in the mountains because the dust is so fine and think the UNI will work better.
That's good. Now you can be the test case for K&N. If you look at Glamisfan's previous post on the post filter he has pictures that show how much dust went past the stock filter and was stopped by the post filter. It will be interesting to see if you wind up being able to see any dust on your post filter after riding in dusty conditions. I know I had the same thing happen on my stock filter on my first weekend out. Really glad I installed the post filter because you can see how much dust was stopped from entering the engine.I'm running the post filter w/my K&N to be on the safe side.