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.

 

Check to see if the valve covers are leaking from the breather covers on top of the valve covers, this happens most of the time . The breather covers can be removed, cleaned and resealed without taking off the valve covers. Re-check the torque on the valve cover bolts , I believe it's 7 ftlbs. It's not a hard job to do iand there are videos on youtube

 

Per dcskmail reply above, I would support re-checking the Valve Cover screw tightness by re-tightening to the proper value. CLICK

I check the tightness of the valve cover & crankcase breather cover screws every 12-18 months and visible signs of leakage haven't appeared as yet (since I did the initial repair of the crankcase breather covers).