it would be hard to say it is the 'best' but it's certainly a good engine. shame they no longer make them as I would have a new one in a heartbeat.
Found this on pistonheads.
So all those german cars on the side of the motorway must have had a lesser engine as PD's are well known for being very reliable.
another thread on honest john.
https://www.honestjohn.co.uk/forum/post/index.htm?t=110492
You could say the same about a 40 yr old diesel merc, it doesn't mean you should go out and buy one.