The Genuine BMW Valvetronic Eccentric Shaft Actuator Seal - 11378662525 is a high-quality seal designed specifically for BMW vehicles. It is used to seal the valve cover and prevent any oil leaks from the eccentric shaft actuator, which controls the variable valve timing in the engine. This seal is made from durable materials and is designed to withstand high temperatures and pressures. It is an essential component for maintaining the proper functioning of the valvetronic system in BMW engines.