Hydraulic systems are used in various industries for a wide range of applications, from construction equipment to manufacturing machinery. One crucial component of hydraulic systems is the oil seal, which plays a critical role in preventing leakage of hydraulic fluid. The oil seal in a hydraulic cylinder is designed to provide a barrier between the moving parts of the cylinder and the hydraulic fluid. This seal helps to prevent contamination of the hydraulic fluid, maintain proper pressure levels, and ensure smooth operation of the cylinder.