Just purchased 2007 roadster with 52K. Apparently there was a reason for the extremely clean engine. Checked the engine (as best I could) took it for a 20 minute test ride, back to the seller, checked the engine everything looked clean and dry. Drove it home (260mi), next day thought I'd check the oil level and guess what? Appears (from a non Good Wrench) valve cover caskets leaking. Not bad, if there is such a thing as not bad and good oil leaks. Expense repair from local shop?. {not dealer) Thought I'd get some ballpark numbers.