Passenger diesel powered cars are exempt from formal emissions testing in most states. BUT! They are still subject to inspection failure (as well as road failure) for "visible" admissions.

And I have to say, I do not see many passenger diesel's smoking excessively. I think the vast majority of diesel owners are too proud to let that happen.

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Toblin

'79 300D, "Liesel von Diesel", 235K

I kid proofed the house....but they still get in