Nissan Quest valve cover oil leak issue after cooling on Nissan Quest

Some Nissan Quest owners report experiencing valve cover oil leaks that occur after the engine cools down, which may indicate issues with the valve cover gasket's sealing properties. Additionally, some owners find that tightening the valve cover screws can help prevent leaks if they have backed out slightly. In certain cases, using an engine sealer has been reported as a temporary solution to mitigate oil leaks from the valve cover. Furthermore, switching to high mileage oil may also be beneficial in reducing these leaks, as some owners have noted positive impacts after using it for a few intervals. Lastly, it's important for owners to consider other potential leak sources, such as the oil pressure sending unit, oil pan gasket, and cam seals, to comprehensively address the issue.