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      05-16-2009, 04:09 PM   #25
SenorFunkyPants
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Drives: E92 DCT M3
Join Date: Mar 2009
Location: UK

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There are around 10 different makes of oil certified for use in this diff, but the one quoted in the Service bulletin is Castrol SAF-XJ which contains friction (slip) modifiers. It is this oil that is regarded as being the most effective are resolving the noises made by the diff clutch pack.