I recently installed their part number E-4961 lifetime air filter in my Dixie. It seems like a pretty decent filter and it is cleanable and reusable forever. It actually cost me less than the same normal paper filter that I got at NAPA last time. My filter doesn't use oil so I just clean it, dry it and reinstall it. http://www.knfilters.com/search/product.aspx?Prod=E-4961 They have a whole bunch of them now for Donaldson, Honda, Kawasaki, Kohler, Briggs and a whole host of other engines. http://www.knfilters.com/industrial.htm This is an excellent way to save money on maintenance.