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well, eventually the most critical thing that can happen is the engine will seize up.

when the head gaskets blow, the antifreeze and oil begin to mix together in the engine, mainly in the cylinders. when this happens, you are getting improper mixtures of everything within the engine. this will cause you to leak oil, antifreeze, get worse gas mileage, and the engine will over heat very very easily. have the head gaskets replaced as soon as possible to save yourself from a world of trouble.

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Q: What damage can be done when head gasket blows on a vauxhall astra 1.8?
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