I checked with Bob Brady from Renntech and was told that the only concern about oiled filters is when the oil gets on the mass air flow sensor. You should make sure that there is not too much oil on the filter when it is first installed. Make sure before you first install the filter that you have god air flow. A good rule of thumb is to wipe some of the oil off of the filter. :mrgreen: He told me that it may not happen right away or it may never happen, but if it does you will have to replace the MAFS.