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Oil seals are typically made of rubber or synthetic materials that are resistant to oil, heat, and pressure. They are designed to withstand the harsh conditions within an engine or machinery, such as high temperatures and varying levels of pressure. The seal is usually placed in a housing or a groove in order to effectively seal the gap between two moving parts.

1. Automotive Engines Oil seals are crucial in engines, where they prevent oil leaks around the crankshaft and camshaft, ensuring that the lubrication system functions properly.