Originally Posted by BMWer14
I use a K & N in my 2000 323i...you don't have to replace it...may have to clean and re-oil it after 50K
My contact at Edmonton BMW advises against using the K&N or any 'oiled' air filter. I've heeded the advice and have been going with an alternative.
His concern is that the oil, if not properly used, will interfere with the O2 sensor.