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He did say, you only want to use the same brand Type-F fluid from the same manufacture so the add-packs and base oils are close to the same. He has no issue with doing this.
Sounds like another so-called expert who knows little to nothing about formulation, PI packages, and their suppliers.
Messing with the dynamic friction coefficients of ATFs' can be disadvantageous for transmission life..
Use type "F" ATF only for modified racing transmission such as the TH350 and TH400 and PowerGlide, and older specific Ford transmissions.
Originally Posted by Molekule
The clutch disc material of Automatic Transmissions, and other wet clutch applications, are made of porous friction materials which are bonded to steel core plates.
Friction materials may include cellulose, carbon fiber, Aramids, fiberglass, or a combination of materials (composites).
Today, composites rule.
Note: Sintered metal composites may be found in HDD applications.
This material must exhibit:
1.) Mu(o), low speed dynamic coefficient; affected by friction material ingredients and ATF additives adsorption
2.) Mu(i), initial dynamic coefficient at high speed; affected by hydrodynamic effects/porosity/compression/roughness.
For some more scientific/engineering background see:
SAE 902148:
Physical and Chemical Properties of a Typical Automatic Transmission Fluid
and,
https://www.bobistheoilguy.com/automatic-transmissions-study/