WH401
Platinum Member
DPF=Diesel Particulate Filter. They are found on the late 2007 through 2010 Ford, GM, and Dodge diesel trucks. Dodge still uses it while Ford and GM went to urea injection.
DPF is simply a particulate trap. When it gets plugged the system injects diesel fuel and basically lights a fire to burn it out and clean things up. It was a MPG killer because it used as much as .6 gallons to run and could do so about every 300 miles or less.
Chris
Actually Ford and Chevy still use the DPF, they just have regeneration performed in a different way in the new trucks. I know on the 6.7 Powerstroke there is now a diesel injector in the exhaust stream to allow them to achieve that high temp burn that they need to clean out the DPF, as opposed to the previous way of just dumping extra amounts of diesel into each cylinder to achieve a higher burn. That method of regen was definitely the killer of MPG as you say. The other benefit of them putting the injector in the exhaust stream is that now the oil shouldn't get heavily diluted with diesel fuel.