I'd stay away from NGK plugs. On the VW TDI anyway, we found they don't get as hot as the Bosch ones, and take longer to get up to temperature.

-J

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

Tesla Model 3. 136,000 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.