I thought that was a W115. I won't claim a 617 powered car is vibration free, but with good mounts they aren't that bad

It would also take a lot of work to make the 6 cyl vw motor smoke that much. Perhaps if you cranked the injection pump case pressure up all the way, but then it would likely run away

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.