You know, the ting with buying a diesel with low miles on it is they are usually trashed. You can't come out on top of any deal with getting rid of a diesel with low miles. The motor itself is a 7k upgrade in most cases and it just doesn't pay. The majority of diesels out there,non fleet, has been tuned, abused, and more than likely has issues. Besides I don't buy used, and if you run fleet your not going to buy used. It's ridiculous to think it's cheaper to buy old and work on it than to buy new take care of it and trade it off with high miles. Putting 200k on a truck in 4 years is a lot of maintenance, and even more if you start with a high mile vehicle, or a low mile junk pile that was tuned and burnt up.