ZF Lifeguard 6 - FF - ZF 6HP19 - 120k miles

[MolaKule]

You were wise to change the fluid and filter when you did. Particulates (from clutches and wear metals) build up over time and add to wear.

I will say one thing about this fluid, it held it's viscosity very well as do most LV fluids these days.

You can thank the new VII and anti-oxidant chemistry for this.

 

[4WD]

Wish they’d follow the lead of Allison with an external filter …