bringing back an oldie but goodie thread.
Since I live Indy where it gets cool I have the D4ATF from Redline in the gearbox. But this is what Redline specs for the z4M.
You guys are sold on the MTL. But why the deviation?
Who here has the RL D4ATF and has grinding?
I think for the synchros to operate to design the fluid spec would be critical.
http://www.redlineoil.com/tech_article.aspx?id=2