Originally Posted by Surly73
If you're rejecting D4ATF because you feel it's too thick for your climate, MTL will be even worse as it's thicker. Now, I've used 9cSt fluids like Redline MTL and Amsoil MTF in my E39 in a (southern) Canadian winter with no problems whatsoever so....
Your Amsoil equivalents would be Amsoil MTF and Amsoil 75W90 (SVG) for the rear end. I've used both Amsoil and Redline in BMW drivelines and I've been happy. My E90 has Amsoil in it right now.
I did not realize that thanks. I've just heard people say that D6 is better than D4 for colder climates, but there isn't a whole lot of info out there. I guess I don't know much about how the thickness of the lubricant will effect the longevity of the transmission.