The late 80's to mid 90's stuff was pretty reliable, and for much longer than the new stuff. The old Safari's and Bighorns are known for longevity with 400,000+km pretty standard. I know the UN were getting about 1,000,000km out of their Safaris. If there are issues it is generally quite cheap to make repairs, often even in the field. The newer high strung diesels I would not trust for serious off road work, just too much ancillary crap to go wrong; the more complicated the more likely there will be failure in adverse conditions. Particularly the electronics with brittle lead free solder and injection systems with dirt and water.
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