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In my experience valve cover gaskets typically don't break until you remove the valve cover. Some (especially older style cork gaskets) tend to harden over time. Once that happens the combination of heating/cooling that expands and contracts the valve cover can cause leaks to develop. When the cover is removed to replace the old leaking part, some of the gasket might stick to the cylinder head breaking the gasket.

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Q: What causes valve cover gaskets to break?
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