That link is scary. If the right oil was used as they say it was, then buying a used van with that 1.6 Hdi engine is taking a big chance.
The cost of stripping the engine down and cleaning out all the oil lines and removing carbon deposits isn't worth the hassle financially.
I can't see they used the right oil in that engine, even with extended servicing gaps.
[/quote]
The extended servicing - specifically long oil changes seem to be the main issue.
Diesel engines never used to expire and turbos certainly lasted the life of the engine when we used to have 6,000 mile oil changes.
It started back in the German Fleet Days when Audi decided that you could use long life oil, change it every 20,000 miles and have servicing costs equivalent to the petrol range. A few years later, once the warranties expired, the fleet's sold them on at around 80 - 100,000 miles and then the car buying public picked up the bills.
All our old Peugeot / Citroen hdi and XUD vehicles have made 200 - 300,000 miles with no major mechanical issues and 6,000 mile oil changes must play a large part in this.