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….It's strange that they recommend Prestone coolant in that Motorcraft bulletin.....especially since i"m pretty sure the Prestone Corguard contains 2-EHA...
That seems strange to me too. However, since it's appears now they've added P/phosphate (based on PQIA), in my observation seems like for some that gets the new Prestone off the schnide as a Dexclone. All indications are Prestone still uses 2eha as inhibitor. I'll give them this though, looks like they are marketing the [censored] out of it to push sales. At least for Transits with heater core issues, for whatever reason(s) appears they even sold FoMoCo on its use.
Something else I didn't know until just now, Prestone and Holts along with Fram were part of the Rank Grp acquisition from Honeywell. Appears Rank sold both Prestone and Holts in 2016 to an outfit called KIK Custom Products, KIK Corp which started as a bleach company.
https://www.kikcorp.com/about-kik/ . That may also explain the newish marketing push for Prestone. Likely also explains why I no longer see the Fram rep that frequents this forum hawking Prestone AF here as he did in the past.
As for the using term PHoat for Prestone CoreGuard now, while it may contain P now, no true Asian Phoat AF uses 2eha as inhibitor. Same as new Prestone jugs advertised for Toyota and Honda both of which use 2eha are not true Asian Phoats. For that reason, I wouldn't use either for Asian applications or anything for that matter.
To the question, no idea if FoMoCo will now convert all current and previous Orange Dex AF to the newer yellow. Looks like currently only the 'truck' applications have made that move, not the PC applications. 'If' FoMoCo/MC pattern follows they won't back spec anything. But what FoMoCo does going forward, until they do it, seems like only speculation at this point. Personally I'm not entirely convinced this not more a heater core, cooling system design issue with the trucks, than an AF issue.
As noted on another thread, I thought Ford had decided on one AF. Instead looks like they have themselves another AF to spec and sell, just what they need.