The 3.0 Duramax solves most of the EGR problems by plumbing post DPF exhaust into the EGR and intake so now the EGR/intake should be free of soot so good job on GM. So now the only emission issue will be the DPF which still is a band aid and most soccer mom drivers will not drive it long enough to get good regens which means it will be always in a regen process and probably diluting the oil and causing internal engine wear problems. In addition I have to wonder if the oil pump belt is compatable with diesel fuel and the various bio diesel blends.