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- A thermostat gasket, typically made from rubber or silicone, is placed between the thermostat housing and the engine block. Its primary function is to create a watertight seal, preventing coolant from leaking out and ensuring a smooth flow through the engine. It acts as a barrier, maintaining the integrity of the cooling system and preventing any contamination that could disrupt the delicate balance of temperature within the engine.
If the seal is being fitted to original equipment you may have some influence over the shaft and housing bore finish, but if you are replacing a worn seal you still need to take into account the condition of these 2 essential parts.
■Viscosity-index improvers: These additives help your engine oil perform as intended despite temperature fluctuations.

Material Code ISO 1629