[edevlin]

The first cleaning I did after the first month was because I did have to drive over several hundred yards of a gravel road daily while they did work on our road. The filter was very dirty.

The second time I cleaned it about a month later was following several long trips, I think I put 3,000+ miles on the car. No gravel road, but again, the filter was very dirty.

I am planning on having a new exhaust system put on next week. I will be getting new oxygen sensors on my 2000 Boxster and I wanted to check the BMC air filter again. I have never tried to clean a traditional air filter to see how much junk gets in it after 1000 miles or so.

But it is impressive how much material it trapped by the BMC filter element. Mostly what I see when I look at the filter is a dark, blackish deposit on the filter. When I hit it with the cleaner and let it sit, then rinse with water, a lot of dark brown material comes off the filter. It appears to be very fine particles.

Part of why I am doing the filter changes is that I just want to mess around with my car and want to see how much material is getting trapped in the filter. I am very careful about not mucking up my MAF with oil if I can help it. I try not to apply too much oil, I wipe off any excess oil, then use compressed air carefully to blow off any loose oil and wipe down the inside of the filter unit before I reinstall it. That process seems to work well so far.

Some folks have said that the BMC oiled filters are not doing that good of a job of getting small particles out of the air stream. It sure seems to be doing a pretty good job to me, have fun,

Ed