nevadanick wrote:
I think alot of you get this confused but DEF has nothing to do with the DPF. The DPF is a soot filter/trap and DEF is injected in exhaust to lower emmissions.
Diesel Exhaust Fluid is used to lower Nitrous Oxide emissions. There is no change in fuel consumption when it is in use.
Diesel Particulate Filter is located right where it is hot, right after the Turbocharger outlet. Diesel fuel is injected into it on the exhaust stroke, or on a separate injector, and is used to ignite the collected carbon soot. It is a lot like lighting charcoal briquettes, it takes a bit of heat to start the ignition, then once the ignition is started, the flames are fanned by additional air flow created by additional turbo boost being fed through the motor and out the exhaust.