Some extra info:
1) This shows some discussion of the difference between MSP/A and SAF-XJ. It is still inconclusive why BMW switched fluids. I personally will be sticking to MSP/A since I am afraid of how finnicky these diffs are, which is why I am not going with an aftermarket diff oil like I normally do. SAF-XJ from bmw should be an ok alternative same as castrol syntrax if you want alternatives.
https://f80.bimmerpost.com/forums/sh...&postcount=202
2) This was quoted on the m4 forum about BMW addressing the wrong fluid fill
https://f80.bimmerpost.com/forums/sh....php?t=1516283
M2, M3, M4 – INCORRECT FLUID USED TO REFILL THE REAR DIFFERENTIAL
MODEL
F80 (M3) F82, F83 (M4) F87 (M2)
situation
BMW quality monitoring of the MSport differentials being replaced under warranty discovered a significant number of these differentials failed because the incorrect fluid used during the 1,200 miles Maintenance Service.
In many cases, technicians replaced the fluid with wrong oil, SAF-XJ+FM Boosted oil (P/N 83 22 2 282 583), which is designed specifically ONLY to be used in the previous generation M3 (E90/E92/93) vehicles.
Consequently, reduced performance, premature wear and excessive noise complaints were experienced.
INFORMATION
For the M2 (F87), M3 (F80) and M4 (F82, F83) vehicles, ONLY use:
Synthetic MPS/A BMW Final Drive Gear Oil (PN 83 22 2 357 992, 1 liter) during a 1,200 ml. Maintenance Service or after a differential replacement.
warranty information
Warranty claims for 1,200 mile Maintenance Services and/or subsequent replacements of the MSport rear axle differential where the incorrect differential oil was use for refilling during the repair will be rejected and/or debited back to your center.