I've used Toyota dex 3 and valvoline synthetic
No changes.
Amazon.com: Toyota Genuine Fluid 00718ATF00 Dexron III Transmission Fluid - 1 Quart : Automotive
It turns out the remanufactured unit for mine is no longer available
The rebuilder is reputable, 2 years 24K mile warranty. They say it will be as good as new, which makes me suspicious.
But they are highly recommended.