These are very common make sure your mechanic inspects and replaces all seals assosiated when doing valve cover gaskets. Many times shops forget to do the tensioner gasket, the half moon under the tensioner, and the cam plugs casuing continued oil leak after the services!
Leaking oil. Needed camshaft chain tensioner and valve cover gaskets.
replaced all top engine seals by audi; took two times to get all leaks fixed