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This paper is the third part of a series of three papers (parts) that address diesel engine applications. It provides an overview on the differences in emissions, operation, and design characteristics between eight categories of various diesel engine applications that engine system design engineers need to know, including on-road heavy-duty, on-road light-duty, land-based mobile off-road, locomotive, marine, stationary, alternative fuels and biodiesel, and two-stroke diesel engines. The analysis technique of competitive benchmarking mapping is introduced by using a large amount of production engine application data to reveal design trends. Two empirical formulae are developed for the relationship between engine performance and design parameters. A summary table of engine system design considerations and priorities for different applications is developed as a design guideline.