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.
The life of the engine unless the engine overheats.
Normally it will last the life of the engine. However if the engine overheats the gasket can be ruined immediately.
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.
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.
A cylinder head gasket is required to effect a seal between the cylinder head and block of a gasoline or diesel engine. It is an integral component of the engine and is requires to perform many functions at the same time during engine operation. The head gasket must maintain the seal around the combustion chamber at peak operating temperature and pressure. The gasket must seal against air, coolants, combustion and engine oil at their respective peak operating temperature and pressure. The materials used and design employed must be thermally and chemically resistant to the products of combustion and the various chemicals, coolants and oils used in the engine. When assembled, the head gasket becomes an important part of the total structure of the engine. It supports the cylinder head along with its operating components. It must be able to withstand the dynamic and thermal forces that are transmitted from the head and block. The type of engine application will be the determining factor in cylinder head gasket design. With engines ranging in size from one cylinder gasoline fired engines up to twelve cylinder, turbocharged or supercharged high-compression diesels, the material and design of the gasket is paramount to it's functional life span. Every application requires a unique cylinder head gasket design to meet the specific performance needs of the engine. The materials and designs used are a result of testing and engineering various metals, composites and chemicals into a gasket that is intended to maintain the necessary sealing capabilities for the life of the engine.(See Fig. 1).
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Peugeot
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.
go and sell the peugeot and dont buy another one in your life, this is the only way not to change the gearbox oil, but to make your life easier
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