Originally Posted by radman
And how does it let in more contaminants?
Hold a K&N (or other oiled gauze element) up to the light and look through it. See those pin-holes? They're letting dust through.
I challenge any K&N user to send their used oil in for mass-spec analysis; if you wheel in any sort of dusty conditions, you'll see dangerous levels of silicates in your oil.
Try it. Really. It's worth the $$. Blackstone labs or other similar one.
Or just call Blackstone and ask them what type of air filter is being used in most of the vehicles that show high silicate contamination of their oil.
Don't get me wrong, I have a DDM CAI w/K&N element on my MINI. But I don't run my MINI on dusty gravel roads... ...and it still shows increased silicate contamination... ...but not enough to bother me...