Hmmm, there are two versions of the RL 75w90, one with frictions modifiers for LSDs, and the other without.

Anyone have a source or part number for OEM fluid?

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09/1996 M3 Alpine/Modena manual sedan (1 of 26)
05/1998 M3 Estoril/Grey automatic sedan (1 of 185)
09/2011 X5 35i Alpine/Schwarz Premium