I suppose you don't use that in a tranny under warranty.
You can't use it in anything that has PWM (pulse width modulated) internals like a modern electronic tranny has. They need the friction modifiers to work correctly.
You guys shoulds switch avatars, after all- which one is married to Natasha?
She is still legally up for grabs until 1530hrs on 18 June... after that she's stuck with me.