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The Detroit Diesel Corporation (DDC) DELTA engine has been specifically designed for the North American market. The advanced engine technologies being pursued for this engine enables its applications to the light truck/SUV vehicles for personal transportation as well as for the light commercial use, such as urban delivery vans. This paper reports on the progress attained so far in engine development. The next stage is currently under way resulting in Generation 1.0 DELTA engine technology. The results of various technology assessments on Generation 0.X hardware are reported. Further, the Generation 1.0 design and its potential will be briefly presented. It is concluded that the DELTA engine technology, including breakthrough advancements, is viable for practical applications to meet future light-duty and heavy-duty emissions with potentially attractive commercial features.