Kia Sorrento - advice please

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I'm thinking of buying a secondhand Kia Sorrento to tow our van. I'm looking at two, both 2.5 CRDI's. One is an automatic with 92k miles, the other is a manual with 62k miles. I'm particularly interested in knowing what might go wrong with a high mileage
vehicle. Which one would you choose and why? Thanks