I am passing along what I have learned today about 6.4 and 6.7 diesel F350 Super Duty Ford p/u's. Both versions have serious recurring radiator issues. There is a service bulletin on the 6.4 SDs extending the 3/36 coverage to 5/100 on the radiator. The 6.7s are having a common, and recurring, leak problem on their radiators as well, but so far no TSBs.
A close friend owns a 2011 Ford F350 Super Duty 6.7L diesel. Yesterday I used it to haul his BobCat back to his job site from the dealer. I noticed a coolant odor and told him about. Being that he was to out of town from this AM to Monday late PM, I offered to take the truck to a local dealership to be checked. Results? Leaking radiator. No big deal? Well, yes it is. The part is $800 and so is the labor, and with 38,700 miles, the coverage is exhausted. The dealership did speak with Ford and offered the repair for $350 as "good will". Not so bad, but an OEM radiator will be used, and the warranty on THAT is 12 months and 12,000 miles. A quick Google search yeilded the fact that these radiators are failing as early as 350 miles, with many owners having to replace the replacement radiators !!!!
So, 1) buyer beware, and 2) owners beware as well. I have NOT been able to find aftermarket radiators, but some Ford dealers sell them on line for ~$550.