While the DPFs do their job in removing particulate matter, the soot left behind can build up and reduce the filter’s effectiveness. A diesel engine can last more than 20 years, but the DPF must be serviced and/or replaced multiple times in that time span. Highly skilled Merx Truck and Trailer technicians treat your diesel particulate filter with care during the inspecting, transporting, cleaning, testing and return processing of your DPF.