Our Dodge truck has a gizmo like the one in the picture below.
It is mounted on the box that holds the air filter, and according to Cummins – or maybe Chrysler – that little gauge will tell you all you ever need to know about when it is time to change the filter. In fact, on pages 390 and 391 of the owners manual, Dodge says you should never open the box to visually inspect the air filter and only replace it when the indicator (the yellow piston inside the clear window) reaches the red.
So far, I’ve gone along with that advice, but our truck (and the air filter that came on it) is now five years old and the odometer shows over 80 thousand miles. At that point, with an old gas engine, the truck would be on air filter number four or five.
I’ve thought about it, and I just can’t see any down side to having a new filter, so in spite of the manual – and the indication on the gauge - I’m going to install a new air filter this week.
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