We have a Skoda Octavia 1.9TDi on a 55 plate that came in as a PX against another newer Octavia that has 611,000 on the clock and still on its original engine.
We phoned up Skoda UK and asked if they would be interested in having a look at it, as they like to take high mileage cars in and pull them apart sometimes, but were told "great to hear about your car, but we are keeping tabs on a couple of Octavia's that have over a million miles on them that are still working hard"
Interestingly on this Merc E Class....I wonder whether they would have got the same mileage out of it on the newer 2.2 engine with the timing chain on the back of it.....the older 2.2 seems to be absolutely bullet proof.