Modern diesels have tons of "technology." When you're running pressures above 40,000 PSI on the common-rail and doing direct injection, there's quite a lot of

Modern diesels have tons of "technology." When you're running pressures above 40,000 PSI on the common-rail and doing direct injection, there's quite a lot of tech in a modern diesel engine. Older, dirtier, diesels don't need this tech but emit quite a lot more particulates and other unwelcomed emissions. Any of the urea injection technologies are a pain. Some modern diesels have low enough emissions to not need the urea. We need more of those and less urea.