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Old 09-04-2018, 03:51 AM
Rodneynelson220 Rodneynelson220 is offline
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Location: Orange County
Join Date: Jun 2017
Posts: 2
Mein Auto: 2011 335d
Originally Posted by alacey View Post
Any know why the air filters on the 320d/328d have an extra layer of plastic mesh? I have never seen that on any diesel I have ever owned. From what I know from working very closely with Fleetguard when I was at Cummins, it doesn't appear to be for added filtration for air into the engine. The stock filter without this layer seems to be more than enough filtration for the engine.

Do these N47 engines have a crank case ventilation filter? If not, and the vent is near the intake, then that would explain this extra layer being for CCV emissions to ensure no blow by gets out of the engine. This is just my guess. Anyone else know?

Itís a pre-filter for snow. It does make intake a lot quieter but I donít rip it off anymore.

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