Mine are a bit feeble compared to some on here. Combined mileage of the two things on the driveway is 282,000 miles — 2002 Peugeot Partner 1.9D with 127,000 and 1994 VW T4 camper with 156,000. The (very slightly) interesting thing about the T4 is that it’s got the 2.0 petrol engine in. Had a bit of a wobble last year with a weird engine running fault that eventually turned out to be the ECU, which you can’t get any more. Found one from a salvage place but it was from a van a year later and didn’t work. Managed to get the existing one rebuilt, though, so that’s OK. I see no reason why it shouldn’t keep going for a very long time yet.
The Peugeot is being a bit French and starting to fall to pieces slightly, the most pressing issue being the increasingly soggy and lopsided driver’s seat. Had to have new front springs for the MOT ‘cos they had cracks in them. Think the engine is essentially indestructable, though.