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Unless you know a transmission specialist who can re-build, then I suspect replacement is your only option, since BMW don't supply any spare parts for the internals of thier diffs, only complete units.
Sadly BMW diff failures are becoming less rare due to changes to the internals - including the use of plastics (!) and smaller internal capacity (i.e. less lubricant).
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E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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