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John Deere doesn't support primary add-on filters finer than 30 micron. In fact, they suggest that primary filters not be used at all. I suspect it has everything with selling their own filters and not introducing varibles their software diagnostic tool can't see. Gil ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ