At some point the chain tensioner was redesigned by BMW. If your X5 has the original tensioner and because the tensioner is not expensive I suggest buying a new chain tensioner from BMW. Good to replace it but I would continue to troubleshoot to verify the core problem prior to addressing the chain tensioner.
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas
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