If you get a tune up here, and the filter is dirty it gets replaced with a new one! I don't clean them! Not saying you don't, but, most I see have'nt been cleaned like they should. I do put their filter in the box and put it in the vehicle. I personally don't like them, I do feel they allow more dirt past, and no offence, but people here run on a lot of gravel roads and forget to clean them anyway! And no, Ford dos'nt approve of them!