And, remember to run the VIN thru CARFAX, for 15$ or so they will tell you the complete mechanical history....particularly if it is salvage from a flood, major wreck, etc. Oh yeah, remember to factor in the cost of FUEl on a 6 or 8 cylinder. Petrol will only go up, and you will have to consider if your customers will pay the increased cost that you will need to pass on. We had a V6 chevvy, it ATE the fuel.