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I don't know about this procedure, but what you are describing is a known issue. Take it to the dealer and ask them to look up the TSB on it. They will replace the diff fluid with a new fluid that will "fix" the issue. I had mine done last week.
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Current: '18 AW Performance Edition m240i
Gone: '15 Mineral Grey m235i || '07 Silver Grey M Coupe || '11 Space Grey 328i XDrive || '08 SparkG M3 || '01 LSB M3 || '01 TiAg 330ci |