For my 2010 135i with 6MT - BME says to use MTF-LT-3. My guys at the BMW Zentrum said MTF-LT-3 has been superceeded to MTF-LT-4 now.
Here is the part number for the oil. It comes in a 5L jug. 110 euro for 5L jug. #93220421925 I paid 21 euros per liter - but that was with my "good guy" discount and no German tax(+19% vat).
I have also seen Bavarian Auto selling the MTF-LT oils. I also heard that on earlier 135i's there is a tag on the trans that tells you wihich oil is required. But I would think that MTF-LT-4 would work in all older trans. But I don't know for sure.
This week I will pick up the proper rear diff oil, made by Castrol. I will post the oil specs & type - along with some photos.
Dackel