2002 CLK55 AMG Cabriolet Cylinder Head Gasket
The OE valve cover gaskets are $25 per side. Most aftermarket ones are $10 per side. So your mechanic is charging about $600 for their labor. And there is a pretty good chance that they'll call and say one (or more) of the old hardened vacuum lines broke. Those are easy to replace as well, but they will be extra.









