Actually, the oil was seeping from the seal right under the valve cover bolt head. It was accessible once the plastic engine cover was removed. I only had to remove the single bolt, remove the rubber seal and replace it with a new one. My oil leak has just begun with a small puddle in only one spark plug hole. I hope your fix is as easy.

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2013 X5 3.5i M Sport
2004 M3 cabriolet SMG