Why is my air filter so black? - Dodge Cummins Diesel Forum
2013-2018 General Discussion General Chit Chat About the 2013 model year differences 6.7L 4th generation Cummins - NO ADVERTISING - Sponsored by: StarLite Diesel

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post #1 of 65 (permalink) Old 11-10-2019, 08:38 AM Thread Starter
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Why is my air filter so black?

I have 17k miles on my 2018. Just replaced the engine air filter. It had some dirt in it of course but was covered with a black, almost greasy stuff on the bottom. What is it? I thought only ambient air entered the bottom of the housing?


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post #2 of 65 (permalink) Old 11-10-2019, 09:19 AM
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Mold??
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post #3 of 65 (permalink) Old 11-10-2019, 11:22 AM
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Now think how your lungs feel
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post #4 of 65 (permalink) Old 11-10-2019, 11:44 AM
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Bottom side of the filter in stock airbox always gets black in every dodge cummins I have had.
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post #5 of 65 (permalink) Old 11-10-2019, 11:58 AM
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Quote:
Originally Posted by RamHunter18 View Post
Now think how your lungs feel
Mine feel good. I think so at least. But I do work out often and run and lift and such.

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post #6 of 65 (permalink) Old 11-10-2019, 12:02 PM Thread Starter
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Just replaced my cabin air filter and it was worse than the engine air filter, but not black. I’ve never had a vehicle with such a black air filter. Even my Powerstroke fords.

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post #7 of 65 (permalink) Old 11-10-2019, 12:27 PM
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Road and tire grime. When winter hits and road is frozen and covered, my filter does not turn black, until spring.

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post #8 of 65 (permalink) Old 11-10-2019, 12:45 PM
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Road and tire grime.
This ^^^

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post #9 of 65 (permalink) Old 11-10-2019, 02:04 PM Thread Starter
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Quote:
Originally Posted by N of 60 View Post
Road and tire grime.
This ^^^
Why doesn’t the air filter on my other vehicles also turn black then?

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post #10 of 65 (permalink) Old 11-10-2019, 02:10 PM
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Why doesn’t the air filter on my other vehicles also turn black then?
Probably doesn't draw air from the front where all the vehicles ahead are throwing all the crap up into it like the air inlet on the RAM.

There is an absolute fool proof way to keep this from happening, wanna know how???
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post #11 of 65 (permalink) Old 11-10-2019, 02:23 PM
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Active air box and it is a really good filter)

18 Ram 2500 Big Horn 68rfe, CTT intact tune, Revmax vb,
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post #12 of 65 (permalink) Old 11-10-2019, 03:11 PM Thread Starter
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Unplug the active air feature? I’m told it only operates under very heavy load or high heat.

2019 RAM 3500 Crew 4x4 Cummins H.O.
2018 RAM 3500 Crew 4x4 6.7L DRW Manual Trans - previous
2017 Ford F-250 Crew 4x4 6.7L Powerstroke
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