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Wouldn't we want to use lubes that use roughly the same additvives when mixing, to make sure we get to the proper reactions when needed?
I once asked Amsoil about mixing MTF and MTG, and they told me not to do it, because they do not use the same EP/AW package. It can been seen looking at VOAs, where MTF appears to have more P and Zn, and MTG Boron and P.
Mixing both, you get kind of half the concentration of one EP package and half the of other. Would'nt that handicap the chemical reaction required during EP?
Both of the Amsoil manual transmission fluids have about the same Anti-Wear (AW) packages and friction modifiers, the only difference being viscosities.
By mixing a GL5 diffy gear lube, which has a Extreme Pressure EP additive, with a GL-4 manual transmission fluid, you get the friction modifier, the EP additive, and the AW additive.
By using about a 3:1 ratio, you get a 3 to 1 proportional mix.