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The most common reason for removing the cylinder head on various cars is the passage of gases into the cooling system and vice versa, the ingress of coolant into the engine cylinders. There can be many reasons for the breakdown of the cylinder head gasket, but the main one is the use of low-quality antifreeze to cool the engine. Bad coolant (acid antifreeze) corrodes the aluminum alloy of the cylinder head near the combustion chamber and under the gasket, through rotten places, gases begin to pass. And then the antifreeze gets into the cylinder.