One of my 240 (2.3 8v) GLT's had 312k on the original engine and box,
I got over 240k on a 2.3 16v turbo with stupid boost
All went wrong for Volvo with the early PRV (V6) engines and 5 cyl Ford units that went on from about 95 on.
Junk.
Best engine I have seen is a Taxi Merc 350 D in Haslach Germany with 400k on the clock.
Engine is left on in the winter to ensure its not cold when they get in, so its done a shed load more in theory.
The old 8v unit in the Mk2/Mk3 is the most reliable engine VW did, rest are pretty meh so far.