Diesel engines can sit around a lot longer than gas engines and still run. If it ran 8 years ago, it will probably still run. However, be careful when you try to start it to have something to shut off the air supply in case you have a run away. The rack can stick or oil seals in the blower can leak enough to cause a run away. The only way to stop it will be to shut off the air supply. What you paid is probably a fair price. Even though its a rarity, there is not much much market for trucks like it and it is probably quite a ways from where it would fetch more money.
