I have run k&n filters in all my vehicles and have never had a problem with the filter,but I was told that the K&N filters are a four ply cotton gauze which is not fine enough for the diesel motors..Apparently diesels are more prone to fine dust particles that enter the intake systems,with this said I purchased an S&B intake that has an eight ply cotton filter for max filtrarion and improved air flow...I want reliabilty as well as performance..