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The cylinder head gasket seals the interface between the engine block and cylinder head, preventing coolant, oil, and combustion gases from mixing.

Signs include white smoke from the exhaust, engine overheating, and coolant contamination in the oil (milky oil appearance).

Yes, if not addressed, it can lead to severe engine damage due to overheating and oil contamination.

Replacing a head gasket is complex and typically requires professional expertise to ensure proper engine reassembly.