Who does DD15 demandates?

[Rawze]

I think he messes with them.. but even he will tell ya that it is not going to be a very good outcome. -- Since gearhead is not around any more .. no one does them properly any more where the engine does not eventually eat its own guts out.

My recommendation.. perform regular egr-tune up work to the engine + keep after everything on a maintenance schedule BEFORE the problems set in and a de-mandate will not even be necessary.