Solo Man
Well-known member
Guys, had to replace the loo type filter with the later cyclonic oil separator on two diesel BMW's recently. The first one, a 2002 E46 320d with 180k kms, when I took the loo type filter out it was hard as stone. I thought that maybe it is supposed to be like that. Wrong, it is supposed to be soft and spongey. On the second car, also 2002 E46, but 330d, the filter was nice and spongey and the turbo is running smoothly and quietly. On the first one the turbo sounds like a police siren(some say a sure sign of impending failure) but funnily enough, after I put the cyclonic oil separator in, it still starts of sounding a bit like a police siren but as the engine gets hotter, the sound is less and less. When I had the cats taken out on this particular car I checked for play on the turbo shaft but it was better than my E39 530d as it had no play what so ever. My E39 had a bit of in/out play but when I checked the bearing after I replaced the turbo with a brand new one, the bearing of the old turbo was still like new. My warning to owners of diesel BMW's is to get the old loo type filter replaced with the cyclonic type as soon as possible!