The valve cover leaks where the timing chain cover connects to the head. An RTV bar is factory fitted along this seam to prevent leaks. The valve cover itself was still sealed but had to be replaced when removing the cover. In addition to this gasket, it is recommended to purchase spark plug tube gaskets. When removing the cap, one of the tube seals ruptured and was damaged. The spark plug seals weren't leaking, but they were dry and depending on the age of the car, needed to be replaced.