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I had an issue during cornering with my 2013 low miles E92 M3 spinning up the less loaded inside wheel (in Euro MDM) causing the TC to kick in and power being reduced.
So I drained the BMW diff oil (Castrol syntrax LS 75w140 plus FM booster) and replaced it with standard Castrol syntrax LS 75w140...the difference was surprising, even within a day or two the tendency to spin up the inside rear wheel was gone and the diff locks up quite nicely.
I suspect the crappy BMW FM boosted oil ruins the way the car drives for a considerable number of owners who use it without needing to.
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