Can a poorly maintained DPF damage my engine?

Yes. As a DPF loads with Diesel Particulate Matter (PM) and ash during normal operation, exhaust flow is restricted creating higher backpressure and temperatures. This can cause several conditions that often lead to expensive engine damage. Some of the engine failure modes caused by a restricted DPF are: Uncontrolled detonation. Burned valves. Cylinder head gasket failure. Turbo Failure EGR system failure Fuel contamination of the engine oil.