Not familiar with the DT 3000, and assume you are are talking about the L3000 DT? If so, that tractor should be worth $10,000 if it is in any kind of shape at all with those hours. If it is running and in good shape, probably more like the $12,000 to $15,000 range. So no, don’t take an offer for a couple thousand. You’ll be making less money on the deal than the mechanic when he turns around and resells it.