2004 Ford F250 Diesel Supplement 2nd Printing - Page 10

Instrumentation The air filter element must be replaced when the colored band on the gauge reaches the CHANGE FILTER mark. Engine performance and fuel economy are adversely affected when the maximum AA AIR FILTER REST restriction is reached. Blowing-out the air filter CHANGE FILTER 75% element with compressed air is 65% 50% not recommended as the compressed air may damage the PUSH BUTTON RESET filter paper. Note: It is not possible to determine the level of filter clogging by visual appearance alone. A filter which appears to be dirty may actually have several thousand kilometers (miles) of life remaining. Always use the underhood air filter restriction gauge to determine when the air filter element needs to be changed. The warning light on the instrument cluster should not be used exclusively for determining when the air filter element needs changing. 10