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I was just flipping throught the duramax supplement w/the owners manual, and noticed that it said it has a air filter indicator. I know theres no better observation then to take it out and inspect it yourself, but i was curious as to, are they fairly accurate? Thanks -Adam
***Look for a few more questions over the coming week as i read the manuals, and get confused....this truck ROCKS!!!!!
 

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They indicate when the filter is plugged.
My experience is your better off pulling out the filter and taking a looky see. At least that was my experience with my 1500.

Jim
 

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My experience has been that by the time the indicator tells you to change, the fuel mileage has been suffering for a while already.
 
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