[manyakaza]

I'm from South Africa and I just changed mine recently with Castrol Final Drive SAF-XJ which is 75w140. It's BMW approved for non LSD and LSD.
My oil was so black and from now on I will change it every 15000km.

[Glim]

Originally Posted by manyakaza

I'm from South Africa and I just changed mine recently with Castrol Final Drive SAF-XJ which is 75w140. It's BMW approved for non LSD and LSD.
My oil was so black and from now on I will change it every 15000km.

How many miles on the fluid?

I can't believe they call it lifetime fill, I am thinking of changing mine next year to see how it looks after one year.

[AlanAZ]

Castrol Final Drive SAF-XJ which is 75w140. It's BMW approved for non LSD and LSD.

Are you sure?? Because:

Per the Castrol Spec Sheet:
http://www.ge39.com/files/SAF_XO_SAF_XJ_B1174_96.pdf

SAF-XO (75w-90) for Open Diffs. (325 - 335)
SAF-XJ (75w-140) for LSD Diffs. (M3)

Per the BMW TIS:

(USA) E9x N52 engines ('06-325i/330i, 328i,) rear diff is designated 188L/188LW and takes SAF-XO (75w-90) with a 1 liter fill.

(USA) E9X N54 TT engine [and the M57TU (335d)] rear diff is designated 215L/215LW and takes SAF-XO (75w-90) with a 1.2 liter fill.

Bentley: SAF-XO for 325-335.

[austin.tillison]

Changed my rear diff oil for the first time at 182k miles (i bought the car with 90k on it)
it was incredibly clean!
my diff is making a terrible whining noise though, so I'm actually replacing it next week

[Meeni]

I used Castrol 75w90. It was spec and also very cheap.

[tlow98]

Changed @ 103k. First change for the car. Looked great with no visible metallic particles.