A head gasket is effectively a seal which is essential for maintaining the temperature and integrity of a car engine. It's a part responsible for sealing pressure within the engine as well as the distribution of oil and coolant. Every time you turn on your engine the head gasket must operate within very high temperatures and pressures, which is exactly what it is designed to do. The engine of your car needs to be cooled constantly as it relies on combustion for power and the head gasket is the core component in performing this job. If the head gasket is damaged, the engine will quickly overheat, and serious damage will be caused. Overheating in the engine of your car will lead to a loss of compression, the mixing of oil, water, coolant as well as a reduction in lubrication. The head gasket is a very complex piece of equipment and so a variety of materials are needed to build it. It must be able to withstand and function normally at extreme temperatures and pressure, it also needs to be resistant to all the chemicals and oils which rush around your car engine. As a result, each gasket from one car to the next is different as the demands of each engine are unique. Car manufacturers spend millions of pounds every year in the research and development of head gaskets to help manage the pressure and cooling of engines. Unfortunately, if you need a head gasket repairing, it will be on the more expensive side.