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In my searching of the internet to find a definate answer to how Ford specs antifreeze, and why, I read a couple of Ford techs mention the antifreeze application chart (or something like that).
Try here, the links for the three anti-freeze options have TSBs and MSDS. There are only three options from motorcraft, Premium, Premium Gold and Specialty.
They were probably referencing the Service Coolant Usage Chart which can be found at the same site that ReAX pointed out. Here is a link to the chart...