Redline MT-90 is the way to go.
However. If you are filling a used transmission for the first time, there is a fairly good chance that the insides are quite filthy. So what I usually do when I pick up a fresh motorset is put 2.5quarts of the cheap generic junk in it, drive it around with that for a few miles. then dump it out and take a look. If it looks really nasty I will repeat the process until it starts coming out quite clean.
THEN put the expensive stuff in it.
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