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      01-03-2013, 07:31 PM   #3
mlhj83
Scythe-Meister
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Drives: '11 E92 M3 DCT ZCP
Join Date: Aug 2011
Location: London

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Just get the friction modifier fluid for the diff under warranty. I had mine done several thousand miles ago and notice no performance difference on fast road driving or on track. Significantly quieter obviously.