*******CHECK CONDITION OF ALL RUBBER SEALS, ESPECIALLY AROUND DOORS!! They are very important in fending off water fron entering inside the car and causing rust!

And of course, check the usual things on a diesel, such as transmission operation, cold start ability, do a compression test if you can, check brakes and tires, check climate control and yes, those rear windows must work, or else it's going to be an expensive trip to the shop to retify that problem.

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Regards,
Aaron