There are many different materials used to manufacture oil seals.
These wires are typically made of a durable, heat-resistant material such as silicone or EPDM (ethylene propylene diene monomer), which allows them to withstand the high temperatures and vibrations present in the engine bay. The wires are also insulated to prevent any interference from external electrical sources, ensuring a consistent spark to each spark plug.An oil seal is designed to perform three major functions: to prevent lubricants from leaking outside the seal even under high pressure, to act as a barrier to retain the lubricating oil, and to prevent dirt and other contaminants from entering the unit.