^again, the SAF-XJ fluid is the DEFAULT BMW APPROVED fluid for M3's differential (see attached). NOT ALL CARS get the diff noise using the SAF-XJ fluid.
For example, my DCT never made noise with SAF-XJ, but my 6MT did.
2011 E92 M3 DCT
1991 Spec Miata
2008 E92 M3 DCT - KW Competition 2-way / Brembo 365 BBK / OMP ARS racing seats / rear seats delete / GT4 aero / AiM EVO4 data logger / SmartyCam racing camera
2008 E92 M3 6MT
2008 E92 335xi