I called Lubegard's tech services and spoke with "Pat." According to him, the dynamic friction properties of the Esso LT-71141 product are identical to a Dexron-IIIH/Mercon fluid, but contained upgraded base oils.
He recommended using any synthetic ATF and adding their red "ATF Protectant" or Platinum "Universal ATF protectant/converter" to the fluid.
So according to that information, any synthetic Dexron-III would work, so I don't see why Amsoil won't work. There's someone using it in place of the Esso LT71141 fluid in an E39 over on roadfly.
He recommended using any synthetic ATF and adding their red "ATF Protectant" or Platinum "Universal ATF protectant/converter" to the fluid.
So according to that information, any synthetic Dexron-III would work, so I don't see why Amsoil won't work. There's someone using it in place of the Esso LT71141 fluid in an E39 over on roadfly.