Review on Mann-Filter CUK 8430 Cabin Filter with Activated Charcoal: Ideal for BMW Models by James Wickware

Unbeatable price and the filter fits my 2006 330xi perfectly. I change it about once a year before the service light goes out, but this year I had to replace it twice because there was so much road salt in the air that the service light came on much earlier than usual. The best advice I can give is to be extremely careful to put the case back in place or water will run into the cabin, through the fan motor and into the passenger side carpet. I know from experience.