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As long as you use a torque wrench and do not over torque the bolts you can try tightening the bolts. The gasket may have been installed without adding silicone sealer where the cover meets the valve cover. That will cause a leak. If you change the gasket use an OE or OEM gasket.
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 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas
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