Any leak no matter where it is, is never ideal, especially if it is a vacuum leak. With leaking seals, the engine works harder, putting more wear and tear on the engine. The Valve Cover Gasket is made of rubber or cork, this seals the cover to the engine, keeping any oil from leaking out. If you are driving with a cracked or broken gasket, the oil will lead, your engine will not be properly lubricated, and then the engine can be damaged seriously.
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