Occasionally, the compression in the cylinder will cause a leak to build in the gasket and the gasket will have to be replaced, or severe damage can take place (a "blown" head gasket). This problem has been exacerbated by the use of aluminum rather than iron cylinder heads; while lighter than iron, aluminum carries a much greater thermal expansion rate, that causes a great deal more stress to be placed on the head gasket. Engine makers have replied to this by adding a non-stick coating like
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