Try rolling the window down and smell the diesel directly next time, you'll appreciate the filter. Recirculate helps too. One thing I would mention that I had a problem with. The origonal filter that comes in the car when new is different from the replacment one. The replacment one they well is the same as a CRV uses, convenient, but it's not exactly the same (and made in Germany?) when you replace it you have to put a pleat and a half over the hold down at the edge to get it to seal properly. If you just jam it in the plastic frame it will not seal. This is one problem I had with mine when I first replaced it. Now the origonal Japanese one just goes right in as it's supposed to. I want a japanese parts hook up.