In Reply to: Microfilter / Pollenfilter 520iA (Euro) 1991 posted by Hans TILLIE on April 02, 1999 at 01:26:10:
: Just back from the dealer. I asked to put in a pollen or microfilter to keep the bad stuff out of my car.
: builddate of the car is 03/90, but it's a 1991 with the M50 engine.
The "official" production introduction date of the microfilter was 11/90 (i.e., cars produced 11/90 and later). Rather than believe the dealer, you will need to see if your car will accept one. This involves removing the glove box, and passenger side center console carpet trim piece to access the location just behind the firewall, where the white plastic door which covers the microfilter can be found. Good luck.