Maybe that's needed for a VLSD transaxle? What's the difference, and why? Maybe I just need to call Redline? The only difference I can find on the spec sheet is that the MT-90 is a bit thicker/heavier/less viscous than the MTL. But I'm more familiar with the MT-90 stuff in the Nissan FWD LSD transaxle and love it. My main question is, what Redline fluid is recommended for these transmissions? I see a lot of people say they used Redline MTL and Redline's website says that's what is popular for BMWs. My normal plan would be to put Redline stuff in it, but I've heard too many people say they've swapped from Redline to Amsoil and are even happier with the change. Whatever is in there has to be much too slippery. The synchros aren't getting nearly enough friction to do their job and if I don't shift slowly and deliberately it can be a bit of a crunchy affair.

What about the S52 transmission? I have some fluid in mine that can't possibly be right. I've been doing a lot of reading, and I'm pretty sold on Amsoil for my next oil change. And I know these companies make great fluids across the board. I've always used Redline fluids for transmissions and Motul for brake fluid. Don't ask me how, but Amsoil products are pretty new to me.

Redline mtl 90