so pentosin is good for our 6AT tranny it seems what about RL D4? i found these links...
http://www.ecstuning.com/BMW-E92-335...sion/ES251177/
http://www.redlineoil.com/product.aspx?pid=51&pcid=9
i also ask RL directly since i don't see D4 on ZF's list whether it is suitable for our tranny. will see how that goes...