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That T-6 is either very old or brand new. It could have been made & bottled before the CK-4 oil came out or it is a new batch (or just the new labeling) that Ford has approved.
I have not seen a bottle of T-6 in the wild that has the new Ford specification listed on it nor have I found a PDS on the Shell website that has the new specification.

Have you found this?
 

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No. I haven’t found any T-6 with the Ford spec on the bottle. I doubt that Shell would change their formula. Ford probably just accepted that T-6 is good oil & won’t hurt their engines. If I had to guess I would say that some money probably changed hands as well.
 
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