Originally Posted by pmason718
I have an 07 with 9,000 miles on it. No off roading at all and all of my miles have come from trips along the east coast. Should I change my air filter?
Not likely... It's as simple as checking it to be sure. IIRC, most of the manuals are going to a 30,000 mile interval now. I read an SAE study not too long ago about a lifetime filter being developed on the Focus by some engineers at ACH (formerly Visteon). It was pretty remarkable, and they tested in some severe conditions... It was still 'ok' after 250,000 miles of dusty conditions beyond what any vehicle would see in normal use.
FWIW, I haven't changed my K&N since I installed it 50,000 miles ago. I've recharged the one in my Explorer once in the last 100,000 miles.