I guess if they meet the Dextron II (or III) spec...
... (which they all do) the ATFanswer would be...
"Mobile 1, Valvoline, Redline or any name brand synthetic" to which I would certainly add Amsoil.
If changed properly every 30K I feel regular (dino?) ATF is probably more than up to the job, but there is no doubting the benefits of synthetics, IMHO.
MANNY- definitely was the scented kind
'91 420 SEL @ 199K, '92 SVX @ 181K, '93 SC400 @ 86K, '93 Kaw ZX-11 @ 30K, '87 F250 @ 181K , 2001 Valkyrie Interstate @ 6K, Y2K Honda NightHawk 250 with 1.5K, '88 420SEL I.@ 179K & the 2nd latest, an '88 420SEL II.@ 210K runnin' parts car, '85 F150 300/NP435