Originally Posted by AC1DD
Excellent information. Seems like the Magnesium additive really stands out in the Honda OEM fluid, why did they chose that specific additive over others?
Anyone know the reasons, seems to me like it is due to the unique design of the Honda automatic unit. They do have clutch packs like a traditional manual right?
So maybe helps limits dissolution of the friction material from just sitting in the fluid?
I also have another question, does anyone have a fresh fluid analysis of the old Honda Z-1 fluid?
I've never seen that but looked everywhere!
I addressed this in a thread in the White Papers Forum:
Originally Posted by Molakule
Transmission fluids are one of the most complex chemical mixtures in an automotive drive train.
Not many people are aware, but the presence of calcium and dispersant compounds in Step-Shift transmission fluids have only a secondary task, and this is for minor cleaning and dispercency, respectively, since there are no combustion products present in an AT fluid.
The main purpose of Calcium and dispersant compounds is to function as one of the many friction modifiers. The other friction modifiers are never shown in low cost analyses but compliment the total friction modification chemistry.
Even the selection of base oils have to be considered as to the effect of overall friction modification. I.e, the base oils, plus any additives, plus the type of VII have to considered in the finished formulation.
So in the Honda AMT's they needed a mix of chemistries to not only obtain a specific Friction Coefficient, but the Honda zinc levels also indicate they needed a certain level of Anti-Wear agents.