Sealing and gasket components create static, leak-proof barriers between mating surfaces in automotive systems. These parts are critical throughout the vehicle, including within the engine (cylinder head, valve cover, oil pan), transmission, and fluid reservoirs. Materials range from compressed fiber, rubber, silicone, and metal composites, selected for temperature, pressure, and fluid resistance. Design features include precise dimensions, coating applications for enhanced sealing, and multi-layer construction to accommodate surface irregularities. Proper installation torque and surface finish are essential for functional integrity and prevention of leaks. Failure typically manifests as fluid loss, pressure drops, or component contamination.