Thought I should bring this to everyone's attention. First a little back story: On our last trip we were is heavy dust all day every day as it was very dry. It didn't help that the forestry service covered one road for about two miles with over 2" of almost talc-like powder..and we had to ride through this twice. It was so bad I couldn't even see my storage box when looking back. It plugged up my CVT filter twice completely so I knew my Uni in the other can was going to be F'ed-up. Pulled it when I got home and yep, packed all the way around and a 1/2" setting on top. Noticed in the down pipe that some had gotten through..not much but some. Cleaned the Uni well and noticed some uneven spacing on the black inner down near where the rubber and it meet. A closer look reveled that there was two placed where the media was torn slightly but this was enough to open two tiny paths into the inside. I believe I did this as I really twist and work that oil through the foam with zeal...and didn't take into account that the flexibility would be limited where the rubber is molded in with the foam. Good thing I had a second one in the air box to catch what got through but I think it would be good practice to inspect these before re-oiling and consider being a little more careful in that area. For now I hot-glued the paths shut and have ordered a new Uni...and as it has been about a year sense I inspected the one in the box I did ...and it's still not in any need to be cleaned so I'll go a while longer on it.
For me I think a particle separator is getting closer...lol