Originally Posted by rsg1963
My first thoughts would have been the exhaust issues these rigs are having. Supposedly running down the highway for a while or towing a load cleans the DPF out. I'd love to see someone try that and see if it made a difference.
It does clean the DPF filter and will help a little bit but you still have the restrictions of the DPF filter and NoX filter. What you said is passive regeneration. Exhuast temperatures are high enough (around 600*F) the filter will burn itself out. If the filter is close to full and temperatures arent high enough the Cummins DPF use raw diesel fuel as a catalyst to burn out the particulate.