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I still don't have detailed knowledge. For me personally there are points in diesel engine development I can't put together. There is the failure of EGR with heavy truck engines because of EGR valve problems. Having higher maintenance costs and worse fuel efficiency. Fleet loss about 30%. But GE and EMD Tier 4 diesel engines seem to work satisfactorily with EGR said by GE to have better fuel efficiency and less maintenance costs. In Germany the fuel efficency of a Mercedes Euro VI truck is about 20% better than a 1996 Mercedes Euro II truck and the Euro III 7% better than Euro II. Euro II and III were reached with measures in the engine itself. Included in this term is EGR which was used on Mercedes Euro III as far as I know. Euro IV and V were SCR and Euro VI is SCR + EGR. DPF were used from 2007. But that is just Mercedes. How does all fit together? And is it possible to build the EMD and GE diesel engines to heavy truck Tier 4 standards? Regards, Volker
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