Originally Posted by double vanos
I wonder what the difference chemically is...gotta be something. F150 forums recently lit up over heater cores plugging up with some members speculating that the coolant change came about from that.
I've read that the new DY AF is supposed to be the Prestone Corguard formula but I don't think that I've actually seen where that has been outright stated by Ford. I think some of it comes from the information that Ford was recommending using Prestone with some of the truck models and Transit that were using the orange and had heater core issues as mentioned. That said, 'if' the DY is Prestone still uses 2eha found in Dex, perhaps at a lower concentration.
As for Ford multiple specs and colors, imo part of it their own doing. Example with this latest DY, if it's good enough to replace Orange Dex, why not back spec it to all the Orange applications? If it really is Prestone, supposed to be a universal type AF anyway. I understand not back specing Orange Dex to G05 models, but not the latest move with DY.
At least they do have an AF chart as linked above showing the correct applications though. That helps somewhat.