Basically all of them have cheated. You needed good emission test results, but without having a miracle idea that evaded everyone else in the business you simply had no competitive results without cheating. That’s physics, and physics is a very hard and unforgiving ruler.
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They were all basically at it, it’s the only way the emissions and performance numbers could be hit.
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Many have been caught. Not all of them have made a big deal about it.
You simply cannot build a compliant engine without cheating. The fight has gone to the courts to find out what kind of cheating is permissible…
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Basically all of them have cheated. You needed good emission test results, but without having a miracle idea that evaded everyone else in the business you simply had no competitive results without cheating. That’s physics, and physics is a very hard and unforgiving ruler.