K & N filter
Foam material when dry is most unsuitable as a form of filter, this is because of the material - it is "open cell in nature" - hence the very fine particles will in time be able to work their way through the material wall & make it out of the other side into MAF & engine.
Hence this is where the oil come into it's own - it stops & traps the dust particles from moving off the surface that it becomes attached to.
Hence when removing the K&N filter from car to clean - ALWAYS return it facing the MAF sensor with same side facing - otherwise you could "suck" any minute particles from "dirty" side of filter back into MAF & engine.
Also when cleaning the filter ALWAYS soak with dirty side down in liquid - so that particles sink, and blow with low pressure from the MAF side of filter, thereby blowing dirt back the way it arrived!!!
My 2 pennies worth - what have others found out?
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