'90s diesels can arguably be less polluting than modern “clean” diesels, depending on which pollutants you care about and if you’re running bio-diesel instead of dino-diesel. (Old diesels can run B100, which is carbon-neutral and emits zero SOx, but it’ll destroy the high-pressure fuel pump on a modern common-rail diesel.)
'90s diesels can arguably be less polluting than modern “clean” diesels, depending on which pollutants you care about and if you’re running bio-diesel instead of dino-diesel. (Old diesels can run B100, which is carbon-neutral and emits zero SOx, but it’ll destroy the high-pressure fuel pump on a modern common-rail diesel.)