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Don't know if this conclusively answers my question. But, the attached Allison white paper on transmission fluids does clearly indicate that I am better off with ATF than 15w40 in the tranny without the internal transmission cooler...

If you look behind the cab on the passenger side you'll see a cluster of three plastic hoses that come up just above the metal rear bulkhead and makes a 180 degree loop then back down. Those are three vents and one of them goes to the top of the transmission. Apparently, the vent i.d. is so...

I'm barely ahead of you on the learning curve as I also recently got my first A3. As to transmission, I also switched to ATF and used the Valvolene equivalent. Bought 5 gallons at NAPA. My situation was a bit different as I discovered oil in my radiator and determined it to be a failed...