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If you read all the responses in Orange Fever's post above, there are members claiming both 10w60 and 10w30 in their X5M after dealer service. From what I gather from that particular thread is that M3 and M5 uses W60 for higher rev engines while the S63 engine uses 10w30. I'm not 100% sure who to believe but I do know that my X5M have been fed on castrol 10w30 for quite some time.
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