In the UK, my main point of reference, the PD engine was fitted to many different vehicles in 115 and 130 bhp versions since around 2000.
There were a few incidences of heavy cam lobe wear when they first came out and the cause was believed to be use of oils meant for the older 90 and 110 tdi's.
There are many products available that are labeled up for the PD engines and they are no longer known to have top end issues anymore.
This is also with the relatively long OCI's common in the UK.
The engine was fitted to the Ford/VW/Seat joint venture 7 seater which was one of the most popular Private Hire vehicles since its release in the late '90s.
Many of these have gone over 300k without issue and some have gone higher than that.
I am not a VAG fanboy and the 140, 2.0 Diesel engine as fitted to more recent VAGs is certainly a victim of poor engineering.
I don't think poor engineering is the issue with the earlier PD.
Though correct oil choice certainly is.
06 Clio1.5DCi,131k 6kOCI Shell Extra 5w40
08 Pathfinder 2.5 Dci Sold with 125k
12 Jaguar XJL 3.0 D Luxury 108k 8kOCI Mob 1 ESP 5w30