Stiction Eleminator really works

Diesels putting out black exhaust is usually incompletely burned fuel and one of the causes can be what your product cleaned up. 227,000 is a good start. I don't expect a big expense until the injectors need replacing, hopefully not before 300k.

I sure hope your miles per gallon number are while towing a tall camper. I get ten on average driving 62 mpg, 11 at 55 - 56. 17 empty at 65 mph, but I have a dually with a 4.10. SRWs usually do better.