i agree... i dont want to contradict you nor Dave, what i know from my own experience is that i replaced a fairly new ATF(it had a nice red colour) from the PAS and ACE based on the recommendations and both sounded better after that... also -25*C is not something miraculous around here in the winter so ATF would not be an option for me, not even according to the NAS recommendations
... i'm not gonna start a debate on that but if you'll have the patience like me to deeply study the specifications of the PAS fluid and any Dexron III you'll see that there are some noticeable differencies, it's enough to see the viscosity index
205/cold climate PAS fluid and
180/Dexron III which is not neglectable...what i'm saying is that the PAS fluid is
the best for the system not that ATF is wrong