If you have a HFM'd ATF, you don't need lubegard black or platinum. Stick with the red.
For wear prone transmissions(like Honda), the platinum also includes the AW/EP additive.
Also, that AW/EP additive should also benefit anything else that shares the ATF, like PS and x-cases.
PBM, feel free to give the Platinum a run at your next Honda service interval. Don't blindly dump the whole bottle. Just add one ounce of Platinum to each quart of OEM ATF. I agree that Hondacura owners need all the help they can get.
If using a multivehicle ATF, your ATF choosen, transmission condition, and its programming, will determine whether you can get away with nothing(usuall) or a tailored dose of an HFM converter.
IMO, Amsoil doesn't need ANY black or platinum in honda/toyota applications. It works well all by itself. But, M1, RP, RL, sometimes will need a little shift softening and will benefit from any HFM modifier in a transmission that needs it.
Whether Amsoil benefits from Red would take some testing. Maybe a run with/without Red for 30k miles and some detailed UOAs can determine whether there is a benefit.
Sorry Mochanic, Lexus does NOT require Black. The additive chosen depends on the ATF requirements and what the owners choses as the fill fluid.
HFM'd ATFs haven't been around for 16 years.
I use Red in transmission with OEM ATFs, like TIV or Z1, all the time. Platinum/black can also be used, but isn't required with OEM fluids. Platinum/Black is a must when using cheaper Dexron fluids as the starting fluid.
I prefer to use Black/Platinum mainly to convert DexronIII/Mercon into multivehicle ATFs.
And, vehicles that require fancy OEM fluids, I always recommend ANY synthetic or blend as the starting fluid, and not cheap DexIII/Mercons. I don't care for cheaper mineral ATFs. IMO, one should either use the OEM fluid, or something superior, even if superior requires a tailored dose of HFM additives.
Smartblend, Gunk, Run rite, Might VS7, have competing products to Lubegard. So, you're not stuck with just lubegard.
Any dealer or dealer tech, thats using NON-OEM fluid should be avoided. Sorry, but if you pay the $$$ for dealer pride, they'd better be using the OEM bottled stuff.