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Are you talking about Castrol Syntrax Limited Slip 75W-140 (formerly Castrol SAF-XJ)? If you are, then your BMW dealership should have it in 55 gallon drums and can give you some in a container you provide. If you want 500ml (you need 3) bottles of it, Mercedes Benz service centers should have it. I believe they use this fluid for their limited slip diffs in the C63. I got them at my local MB dealership for about $20 a bottle.
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