The last 2 times I changed my Air filter in the stock air box the filter was covered with a dirty oily residue. ??? Dirt I expected but not oil. No oil reisdue on my turbo blades yet. I use a fleet guard air filter in the stock box. Has anyone seen this before or have any idea on where it may be comming from? I think it may be comming from the breather vent bottle but I am not sure.

 

i had the same problem on my stock filter, but i swapped out to a bhaf from napa and no longer have the oily problem. but most likely from the breather.