Quote:
Originally Posted by cornontherob
If it's not the tubes leaking, what should I suspect?
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Follow the trail of oil. If you're unsure, clean it up with some simple green and check again. If you don't have a leak, and you have so evidence it's coming through the exhaust then I'd guess you're mistaking that smell for the boxster smell. The boxster is mid rear, the engine gets very hot and you're likely to have a small buying oil/rubber smell after a long drive.
First things first, check and see if it's spark plug tubes, oil fill tube or even valve cover. If you find the oil, it's easy to find where it's coming from.