Depends on the service history, how its been driven, if the turbo has always been given time to cool down, that sort of stuff, I personally would keep looking for that sort of mileage but I don't know it might be a good car.
I would be checking the service history, if all checks out i wouldnt steer clear because of the amount of km's it has, with regular servicing i dont see why most engines wont last. Just curious what year and engine it is?
Thats fair enough, there are plenty of them on the market, I am sure you will find one with lower KM's, my 06 has just clocked over 86,000 so cant complain
my 04 str nav has done 210 000 k and has no signs of stopping yet? Check the service manuals, as long as a diesel has been regularly serviced and looked after it should do 500 000 no problems. Petrol another story. If the guy serviced his own car and only got it done properly every 2nd service ask him what he did every service. For the right price could be a good buy.