Red Line MTL-LV for a Toyota TC?

[The Critic]

Not disagreeing with you. It will be interesting.

Just making statements here: I THINK the Toyota dealer bottle is in the 5-6cSt range. Amsoil MTF is in the 9 cSt range and works perfectly. People are using Mobil 75W-90 and not having problems engaging or disengaging. Fairly wide tolerance.

All of the dealers around here use 75W90 MOC/BG or bulk when doing customer-pay driveline fluid changes. Not saying it is correct, but I think the matter is not as serious as we may think.