If you are only talking about the engine, then it is virtually bullet proof and should last upwards of 500,000 kilometres. However the head stem seals and valve guides are known to fail (dry out) and need to be replaced ( generally after 150,000 kms). Head gaskets due to overheating are known to fail so careful attention to the cooling system and fans must be made. If you have a service book and keep the maintenance up to the car there is no reason that the car will not last for many years.

Getting her a good reliable one with filled in service books is the task. Remember the Benz Mantra. Nothing is more expensive than a cheap Mercedes Benz.

Safest, reliable Japanese car in Australia is Subaru 4 wheel drive (Outback).