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Old 12-08-2011, 11:06 AM   #4
Registered User
Join Date: Jun 2011
Location: SoCal
Posts: 81
My Ride: '05 e46 M3 6spd.
It's seriously a must to use the BMW diff fluid with the FM booster. So many people have thought they had blown their diff's, but just had the wrong fluid.

Replace it with the BMW approved fluid, then do some figure 8's like noted above, and the noise will go away. Mobil 1 fluid doesnt have the friction booster which LSD diff's need!
Jtrem is offline   Reply With Quote