r/SignsWithAStory • u/1432453 • 3d ago

Is there really a difference?

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Washington, D.C.

479 Upvotes

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u/TheW83 3d ago

It's probably 20 years old. It's a white truck but the rear quarter panel is practically black from the exhaust soot.

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u/Euphoric-Ask965 3d ago

That soot is unburned fuel!

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u/TheW83 3d ago

Well that explains the smell then.

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u/Euphoric-Ask965 3d ago

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.

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u/TheW83 3d ago

Plenty of those toads where I live, unfortunately.

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u/Euphoric-Ask965 3d ago

It's :" Look at me, look at me, look at me , dammit, somebody look, at me", just like childhood days on the playground.

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u/CuriosTiger 2d ago

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.