I have one of those &#$@&% air filters that are supposed to be 100K filter on the Focus. I have recently been thinking about changing it but Ford want's an arm,leg hand,foot neck and head for one of those things.$420!!! So I was wondering if Amsoil has a better idea than Ford for a replacement. Mine has the restriction gauge on the filter housing and appears fine, and there is no loss of MPG, and the air intake is clean so this contraption must still be working, but one of these days I will have to replace it. I checked with Ford and I was told they have never had one go bad. The only replacements they have seen have been on wrecks. Paublo, where are you?