This. My colleague’s Mazda 6 diesel got through one new engine and two new turbochargers in 3 years, and was off the road for a total of 12 weeks. We have also had a few Passat TDI engines go bang on the company fleet.
20 years ago a 2.0 litre turbo diesel put out 90 bhp and lasted forever. Today BMW squeeze up to 230 bhp from a 2.0 litre 4, and outputs of 150-180 bhp are routine. Maybe we shouldn’t be surprised that they are less reliable!