The Diesel Particulate Filter (DPF) is a device installed in the exhaust stream in all new diesel engines made after January 1, 2007. The DPF is comprised of two chambers. The first chamber works to oxidize a portion of the NO gas in the exhaust to NO2. The second chamber then destroys the soot that is trapped inside. The result of this process is a small amount of ash which remains in the filter. This ash builds up and reduces the effectiveness of the DPF which must be cleaned. Permian Drive Auto and Diesel, in association with Concho Valley Clean Diesel, will test the filter in a vacuum to find the air flow resistance while it is dirty, pre-clean the filter with compressed air in a filtered machine, bake the filter overnight at 1300 degrees F., clean with compressed air again, re-test the filter in a vacuum to test the finished air flow resistance, then clean the exterior of the filter.