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ATF is definitely a compromize when it comes to AW properties. I prefer a good MTF. You dont need to use a 75w-90 MTF, but rather something that is a bit thinner.
I thin 9-10cSt at 100C is a good viscosity, and my 318i shifts perfectly using Amsoil MTF in the coldest part of winter.
I think redline MTF is similar in viscosity.
Redline D4 ATF would be my choice in an ATF because it does have a bit higher AW content than some others (GL-4 level versus just a standard ATF add pack), so good choice there, but if you can take the heavier fluid, Id get away from ATF, personally. No rush because you have about the best one you can in there...
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