I thought I might as well post this info here too, since this IS the sticky.
PyratOne's awesome diff fluid thread...
1M limited slip differential information
http://www.1addicts.com/forums/showt...1#post10976891
Ok guys... today I went to my BMW Zentrum and asked about the diff fluids for the 1M. Here is what I found out.
The factory fill oil for the diff is Castrol SAF-XJ. NOT the +FM, just the regular SAF-XJ oil. This oil should be changed at the first service 2,000 kms or 1,200 miles on M cars and at every third oil change. The
Castrol SAF-XJ+FM diff oil is spec'd for the M3 e90, e92, e93 and 1er M Coupe, aka e82 M Coupe, aka 1M.
You need
three 500ml bottles to change the diff oil out. The diff holds aprox 1.2L
Castrol SAF-XJ+FM BMW part number: 83222282583 for one 500ml bottle. cost is
30 euros per bottle at my BMW Zentrum.
I asked about the
Castrol SAF-XJ+FM diff oil. My dealer had never heard of this
+FM stuff... but it is a good part number. The price of
+FM is 30 euros per 500ml bottle. Even though my dealer never heard of +FM fluid... the above TSB states to use it durring servicing. Its a little strange since they say they always just use (regular) Castrol SAF-XJ (w/o +FM) when they service M cars. In fact that is all they stock on hand.
I have scan'd the service document(that I got today) for you 1M guys. At the bottom of the first page BMW AG also lists
other diff oils that you can use in place of
Castrol SAF-XJ+FM.
hinterachsgetriebe öl = rear differential gear oil
SAF-XJ +FM (plus Friction Modifier) some fotos I found on the net of +FM...