Spark plug tube o-ring replacemnt (2 per tube x 6 tubes = 12 total) is an easy DIY fix.
The valve covers themselves are sealed using Loctite as previously mentioned (there is no actual gasket). This can be done with the engine still in the car but its a big job and a PITA. Most owners just live with the leak as long as its minor.
This instruction will give you an idea of what is required (realizing that all you'll need to do is remove and re-seal the cam covers): http://www.pelicanparts.com/techarticles/Boxster_Tech/16-ENGINE-Camshaft_Swap_and_Chain_Tensioner/16-ENGINE-Camshaft_Swap_and_Chain_Tensioner.htm
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
Last edited by thstone; 05-22-2012 at 09:58 PM.
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