Cold Air Intake
You have to really cake on the oil before any will blow inside the housing, let alone work there way around the little wires in the MAF.
The MAF sensor is very important and should not be neglected like most do.
The problems with oil on the MAF are overblown and unwarranted on trucks that have the complete cold air intake system - in the case of '05 and newer Super Duty trucks, this is the K&N 63 Series Aircharger and I have no fear in putting one on my Super Duty. I had the complete intake on my 1996 GMC Sierra from K&N (old FIPK style) and never had any problems in some very dusty driving conditions.
It still comes down to personal choice and I wouldn't use anything but K&N due to the fit and finish and the good personal experience I have had.



