Both GM and BMW no longer reccommend the Texaco ATF for this transmission. They both reccommend Dexron VI.

Dexron VI specs are very tightly controlled by GM so that there is not much variation between brands. I believe that Valvoline is the only Dexron VI provider that claims to have a full synthetic Dexron VI, so if I was going Dexron VI, I would use Valvoline’s full synthetic.

The only reason that I did not use Dexron VI when I made my change was that I had not seen many reports of people going with Dexron VI in their A5S390R. At this point, I've seen many more reports of people using it without trouble.

Although it is not Dexron III or VI certified, I went with RedLine D4ATF because I've seen many reports of people using it in their A5S390R without trouble. Like Amsoil, RedLine claims it is suitable for use in that transmission even though it is not certified to the spec.

Amsoil, RedLine or any Dexron VI are likely to work very well.

Let us know what you choose.