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I agree with DEI37. I don't know anything about the Powerstroke or Cummins, but the 6.5's were good motors, tough as hell. Used to work on them alot in pickups/vans/cube vans. I've seen guys drive them into the shop without an oil pan on them (too heavy to push it in and steer without power steering), engines with 500,000+km on them, there was one with a broken crank that was driven in with a complaint of a ticking noise, and once in a van, the tech had the crossover pipe for the turbo off (so the turbo prettymuch blew air into the shop and not into the engine), and he dropped a rag, which got sucked into one of the intake manifolds. He held it to the floor and the rag came out the tailpipe over the next couple minutes in several small burnt pieces.
6.2's are gutless and not really any more efficient than 6.5s in my opinion. As for the new turbo diesel 6.6 "Duramax", it's made by Isuzu, and if I had a nickel for every one I've seen in the shop for injectors I'd be a zillionaire. 1-3 years old, and they come in for a complaint of an oil leak...turns out the injectors are shot, leak fuel into the oil, you check the oil level and it's 4" above the full mark. Replacing the injectors isn't exactly a fun job either. Lucky for the customers they've all been under warranty so far.
I wouldn't hesitate from buying a 6.5 but I'd stay away from a 6.2 or Duramax (although it sounds like you're looking for an older truck at which point the Duramax is out). A quick and easy way to spot the difference (if I recall) is that if it has a turbo it's a 6.5, naturally aspirated it's a 6.2. I think the 6.5s also had holes in the front bumper (air intakes, on pickups anyway) wheras the 6.2s did not. I could be mistaken though. I don't have any experience with the Cummins or Ford engines so I can't say there.
Adam
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