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Most head gaskets do in fact last the life of the car.

The major cause of a head gasket failiure is lack of antifreeze in the system.

antifreeze contains corrosion inhibitors which prevent the head gasket

rotting and then blowing.

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10y ago

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Expected life of a head gasket?

The life of the engine unless the engine overheats.


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Normally it will last the life of the engine. However if the engine overheats the gasket can be ruined immediately.


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It is not good. Your head gasket has holes for the oil and water passages in the engine. You may have deprived your engine of oil or coolant and this may shortened the life of your engine.


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I would certainly change them and have done so when I've replaced head gaskets on my vehicles. They don't cost much. If you are adept at 'reading' plugs, and they look ok, and you clean them, and you re-gap them to specs, MAYBE it would be fine to reuse your old ones. But to me it's cheaper just to replace these items which do wear out over time anyway. Some spark plugs in some engines have an expected 100,000 miles' life to them. But I'd change them anyway while I was down and dirty doing the the head gasket work.


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Why does headgasket blow?

I interpret your question to be: Why do head gaskets (on an engine) blow-out? There can be several problems: The engine head itself might have been tightened incorrectly (misstorqued). This can happen when the engine was first assembled or after a repair. When this happens the pressure on the gasket in not even and not tight enough in places, so the gas pressure of the engine finds the weak spot. The gasket might be defective. Most gaskets have multiple layers bonded together. If the bonding is not correct or a gasket layer was misscut, again, the gas pressure will find the weak spot. The engine head or cylinder block could be warped. This can happen when an engine severely overheats. The two components will not bed the gasket properly and the result can be a blown gasket. The gasket could have simply worn out. They do have a life expectancy and require replacement when the engine ages.


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