I got both mk3 and mk4.
I enjoyed the both but prefer mk4 after all. mk3 was more like a statement with no cost spared where with mk4 finance department got a bit more to say in my private opinion.
What I liked about mk4 was updated interior, bigger boot, better hybrid system, premier grade seats. Infotainment system is more or less the same but mk4 got refreshed graphics and bigger screen, better ML sound system. I also preferred the look of mk4 but that is a personal choice.
I don't remember the details but mk4 was around 10% better with fuel.
As for millage if serviced well 125k is nothing to be worry about. At 125k miles you should have:
- Inverter coolant done at 100k
- Spark plugs done at 125k (ask if done)
- New front brakes at around 100-120k (check the state if new are fitted)
- Gearbox oil should also be changed already, if not budget for change straight away.
When I bought my mk4 it was at 140k. When I was selling it was at 180k. When I recently checked it was almost 200k now with the new owner 🙂
Check the MOT history for YP12 VCA - that is how it should look like 🙂
Attached is the driver seat at almost 180k miles 🙂 I bought a new steering wheel at 150k as factory witted one was a bit tired 🙂