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      06-03-2019, 06:12 PM   #7

Drives: F90 M5
Join Date: Jul 2017
Location: SoCal

iTrader: (1)

Originally Posted by E55 Bulldog View Post
Call me crazy but I have been told over and over not to use K&N on turbo cars and trucks. I have had a number of diesel trucks and K&N is a solid NO because they let too much past and it dusts your turbos.
That info is incorrect. K&N uses paper filter media and nothing blocks dust and dirt more than a paper media filter.

The reason you would not want to use a K&N filter is because of the filter oil getting on the MAF sensors and causing issues you could potentially see on a drop in filter that sits close to the MAF sensors. On the cold air intake system the filters sit around 3 feet away from the MAF sensors so it's not something to be worried about, the oil could make it's way up the tube a little but it's not going to reach the sensors. For a drop in filter I would use something like an AFE Pro Dry media filter instead of the blue oiled version.