2007 Buick Rendezvous - finding substitute trans fluid

I am attempting to find a viable substitution for my Rendezvous. everyone specifies AT-216 Synthetic which is very hard to find locally. Please advise.

Castrol Transmax DEXRON®-VI Transmission Fluid Really, anything rated as Dexron VI will work. Your owners manual also lists acceptable ATF.

Who is “everyone” and why are they so hyped on AT-216?

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spend the bucks at the dealer.