Volkswagen had software that detected when emissions were being tested and subsequently gimped the motor so that emissions were within regulations. After testing was finished it reverted back to a higher pollution rate.
I'm sure it's not bad either way. But most new diesels require some crazy expensive air scrubbing technology that would force small diesel cars to be too expensive and heavy. Federal government might or already has issued a mandatory recall. Making the unrecalled vehicles desireble because they will get better fuel economy and horsepower/torque
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