Dodge 2004 Ram 2500 Owner's Manual page 333

A visual inspection of the air cleaner filter element is
never recommended under normal circumstances. A
badly restricted element may appear clean while a soiled
element may be quite effective in filtering particles
without restricting air flow. Rely on the Filter Minder™
to determine when a filter change is necessary.
After a new filter element is inserted, press the rubber
button on the top of the Filter Minder™. This action will
reset the yellow disc to the clean position.
MAINTAINING YOUR VEHICLE
CAUTION!
When using an engine cleaner or a degreaser, be sure
to wrap and tape the Filter Minder™ to protect the
plastic housing from damage and discoloration.
NOTE: Many aftermarket performance air filter ele-
ments do not adequately filter the air entering the engine.
Use of such filters can severely damage your engine and
such damage is not covered by the manufacturer's war-
ranty.
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