Changed it myself yesterday for the second time on my 2009 v6 currently with 90k. Change every 30k. Was shocked that filter was way cleaner than I though it should be. But even more surprising was that the bottom of the filter was cleaner than the top. Air does flow from bottom to top, right? Old filter (Purolator) seemed to be installed properly - only one way it will go in - at least the two snap down latches were attached as they should be. Any and all comments would be welcomed.