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I'm curious how other companies did not know about this. Did engineers at GM/Chevy not inspect the VW product and figure out that it was cheating or even suspect that their competitor couldn't have some sort of magic engineering snake oil to pass emissions.

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Great question. I've seen companies with entire teams dedicated to dissecting the performance claims of the competition, and then running their own tests to verify and/or debunk the same. Keeps everyone honest, and it prods along the in-house engineering effort. Why didn't the other automakers see this?

Maybe other car companies don't want to know because VW is not the only guilty company? What are the odds that only one car company cheated on only one car model?

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