Sadly, a high-mile diesel anything is a high risk these days, in contrast to engines like the good old Perkins Prima and Peugeot/Citroen XUD, which would rattle on for years.
In the name of reducing noise and emissions, there are too many added complications which can, and do, go wrong with high mileage. A well looked-after diesel will avoid the pitfalls, as taxi-drivers have shown - but when you buy a cheap car you have no guarantee that the previous owners have looked after it.
That of course is also true of petrol engines, but as a broad generalisation failures tend to be less disastrous.
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