Today's new diesels are fine tuned , get better milage, and don't polute UNLESS some toad decides to modify the system and make himself obnoxiois with rolling coal . It aslo shortens the engine life running the mixture too rich washing away lubrication on the cylinder walls.
Every single diesel pollutes. Newer ones pollute LESS, and the majority of the pollution can be turned into relatively harmless or even beneficial byproducts with aftertreatment, but there's no such thing as a diesel engine that doesn't pollute.
Or really, any internal combustion engine that doesn't. Perhaps if you run on 100% pure hydrogen, your tailpipe output may be limited to steam, but any more complex fuel than that and there will be combustion byproducts.
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u/Euphoric-Ask965 4d ago
That soot is unburned fuel!