>Citroën were the first to make diesel filters standard. And my C15 had the HDi engine with diesel filters.

Modern Diesel Engines have gotten so much better in every single area.

>And unlike others, they did not cheat and were not part of the Diesel scandal.

https://www.reuters.com/sustainability/dutch-court-says-dies...

Watch: https://www.youtube.com/watch?v=py37TT6PxW4 to see just how common cheating was. Also have a look at the graph at 17:47 .