6.7L Cummins Forum

Hi everyone. My oil is staying black even after oil changes. It was my impression that after break-in that it would remain clear at least a short while. I am ignoring the monitor and instead doing changes every 5k-6k miles. Any comments would be appreciated.

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2010 2500HD Cummins 6.7l Laramie Crew 4WD
Mygig, Nav, Alpine sound, Rhino liner, Roll-top cover, air bags.

Oil always turns black mostly from heat but also from exhaust gas that's recirculated into the combustion chamber per the EPA.

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10

Even with the EGR unplugged or deleted, the engine oil in a diesel goes black.
If you unplug the EGR, you should notice that the oil stays cleaner. Look closely along the edges of the oil on the dip stick, you should be able to see through the oil. I run an unplugged EGR and a bypass filter. The oil still gets black but certainly retains that opaqueness as above. A few years ago (well 25) I was around many 855 Cummins engines in large farm tractors and hi-way trucks. The oil in those engines was always black as well. Change the oil and the filter every 5,000 to 7,000 miles and all will be well. I change the oil and filter in my truck every 10,000 KMs.

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2007 Ram 2500 QC 4x4 SLT TRX4-Offroad 6.7L Automatic. '08 Jeep WK 3.0L diesel-wife's DD.
1998 Jeep ZJ 4.0L Automatic Selectrac-project for our son. '98 Jeep XJ-my wife's former DD.
1965 Dodge Polara 880 Convertible 383 Automatic.