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X-Ray suggested that I make a video on this topic, I agree and thank him for the excellent suggestion. Very interesting topic, DPF or FAP (one and the same) filters have been in diesel engines since Euro4 engines, unfortunately many owners are not even aware that they have this technology in their exhaust system, I hope that this video will help them understand the entire SCR technology with DPF filter and AdBlue-DEF fluid. Special thanks for original animations: VW, Audi, Cummins, aFe, Stratus and Mr.Dan Watson from AMSOIL.