I have a 2010 Dodge Cummins 3500 dually truck. Does anyone out there know why the oil gets black after just a few miles? Does this damage the life of the engine? I had a 2003 2500 Dodge diesel and the oil stayed clean for quite a few miles just like in a gas engine.
Your oil is getting blacker sooner due to Dodges use of EGR (exhaust gas recirculation) to reduce "carbon" (soot) emmissions to legislated levels for passenger vehicles.
The EGR system directly takes exhaust gases and soot and reroute it directly into the intake manifold/horn of newer trucks.
This system also incorporates a DPF (diesel particulate filter) in the exhaust system after the turbo. The system also requires a periodic (computer controled) "regeneration" cycle that injects raw fuel into the exhaust to burn off the collected soot in the filter. Totally automated.
Not a great setup, but necessary to retain for warranty coverage,and meet emmisions standards without the use of DEF (diesel exhaust fluid).
There are numerous EGR "delete" kits available and DPF delete exhaust systems, but the use of these kits generally requires the use of an aftermarket programmer capable of clearing DTC's (diagnostic trouble codes). And the use of a programmer (according to MOST dealerships) will land you in a "restricted warranty".
The soot blackening the oil sooner will not drastically impede the oil performance as long as it is changed regularly and a quality oil filter is used.
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Hope this was helpful