Thanks a lot for this info.
I may add some things from own experience on a E32 750il Alpina B12 5.0. Tranny is a 4HP24, torque converter is from Alpina.
Bought about 2 months ago. From 1988, about 180.000 km on the clock.
Changed the transmission oil immy after buying, probably the first time since 1988.
The fluid was darker than the new 'cherry cough syrup', but no burnt smell. The 2 magnets in the oil pan showed some fine 'dusting' of iron in it.
Filter I did not change at that time. I changed the fluid only, plus cleaned the magnets,
used compressed air to blow out the fluid from the cooler lines and the transmission oil cooler, torque converter as much as possible.
Then I filled Chevron Automatic Transmission Fluid MD-3
https://www.cbest.chevron.com/msdsSe...searchScreen=Y
I used that one for just one reason, it was the cheapest I could get at COSTCO and actually the only one they had when I went there.

After 5-8000 km I changed it again on last Saturday, same procedure as before, but now also the filter+O-ring. Oil was almost looking the same colour as when it was filled, some more dust of metals again in the magnets, but that looks normal like wear and from the cleaning process with the new fluid.

Then I also removed the valve body and tested the valves and cleaned the channels, no balls changed, no orifices, also not the large gasket between the 2 big parts. Just to see if there is any dirt inside.
Looked good.
Now it runs much smoother, I would say perfect like a new one. Before the shifting was often like a shock when switching gears.
In my opinion - and I now have opened quite a number of 4HP22/24 ZF transmissions-, a new fluid cannot harm a transmission like some people still believe. It cleans the valve body and all these small channels from deposits which accumulate over the years.
And if a transmissions fails after an oil change, it was not because of the oil change, but that was indeed anyway the end of the tranny.
Flushing seems also a good idea, at least if you have the possibility to flush the torque converter and the oil cooler and the oil cooler lines.
And now I used the same Chevron stuff. I have no comparable figures with regards to a specific transmission oil to be better or not, so that I leave to other experts.