You are right. ATF MA1 is not a special ATF. There are in fact no "special" ATFs as ATF fluids are manufactured to a set of parameters established by the transmission designer as what is needed by the particular transmission design. As you so rightly point out, there exist many ATF fluids from different manufacturers that meet the parameters specified by the ATF MA1 specification.
I agree you can use a non-Mitsu branded ATF in an Aisin R8AWG/V8AWG 8 speed as long as it is equivalent to the ATF MA1 specification.






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