Even the green foam will crumble when not kept clean and oiled.Oiled mine, but wrung them out real good. A very light oiling is all it needs. Helps catch the dirt better, or K&N would tell you to install their filters dry too...
I sculpted my filters from green lawnmower filter media, which is supposed to get oiled. I didn't feel comfortable oiling some foam that may break down if it came into contact with oil.
The dry foam catches the big particles, the smaller ones can make their way through. The oiled filter traps all dirt particles. It's your choice, but nowhere on the net can you find a foam filter manufacturer recommend dry foam filters. Either way, change them out every few years.
Well, of course. Not all foam lasts forever. I intend to replace them every couple of years any ways. Very cheap insurance.Even the green foam will crumble when not kept clean and oiled.
It will anyway, even if kept clean and oiled. How much they are used, how they are cleaned, the type of oil used, and the type of foam will determine how long before they degrade.Even the green foam will crumble when not kept clean and oiled.
I agree with you, but I don't follow the book on this one.If you follow the service manual, sub air filter gets oiled but the cruise filter is supposed to be dry, no oil....
Again, this is just me. Maybe if I drove on more dirt or dusty roads I might do something else....Nope, I installed both dry.