THANKS FOR ALL OF INFO GUYS..i HAVE 10.000 KMS WHICH IS ROUGHLY 6000 MILES ON FUEL FILTER..50000KMS ON AIR FILTER WHICH IS 30000 MILES..i USUALLY CHANGE MY OIL BETWEEN 5-6000 KMS AS i TOW A FITHWHEEL TO FLDA IN FALL..DO YOU THINK i WILL BE OK WITH FUEL FILTER TILL i GET TO FLDA IN NOV AT THAT TIME i WILL HAVE CLOSE TO 9000 MILES ON FUEL FILTER...i HAVE LOOKED AIR FILTER MINDER AND AFTER ALL THIS MILAGE IT DOES NOT SEEM TO HAVE MOVED SINCE i INSTALLED THE NEW AIR FILTER CLOSE TO 4 YRS AGO..WINEMAKER