I just cleaned my air filter for the first time and it was a little tough to gauge how much oil to use. I'm using a Foam Filter Treatment I picked up at the Yami dealer and oiled it in a clear plastic bag. It didn't seam to flow through the filter very well so I just kept adding it until it was well coated. I'd estimate that I used about half of the 16 oz bottle. Does that seem about right. It's been drying for the 15 minutes recommended on the bottle but still seems pretty wet. If that's the right amount then I"m going to be going through a lot of this stuff if I use 1/2 bottle each time. Thanks!