I think this view is a rather outdated idea that does not apply to diesels with modern engine management systems.
Well, the forums seem to have plenty of reports of Euro6 diesels suffering from DPF problems when used for short journeys. Like I said, there's no doubt that Euro6 diesels are a lot cleaner than their predecessors, and they are permitted in many(all?) ULEZ zones, but there's equally no doubt that as an engine solution they are falling out of favour for use in smaller capacity cars typical of the type built by FIAT. I don't find it in the least surprising that they are stopping making them.
