@ Taco on edit: Depends on the brand. A 12 year old diesel truck will bring premium even 12 years from now. No matter how the engine industry goes there will always be diesel heads that will pay an arm or leg for a good used truck (including a 6.0)Yes if you have/had a Ford diesel they are very expensive to maintain and repair but the other, no one has proven to me yet that they are more expensive to maintain or repair. I have put thousands into the gas trucks at work just like the diesels. We mainly have Fords but wo do have a couple Cummins. ;)