One of the primary functions of cylinder oil seals is to prevent oil leakage. In machinery that relies on cylinders, such as hydraulic systems, engines, and compressors, oil leakage can lead to a loss of lubrication and decreased performance. This can result in increased wear and tear on the machinery, leading to costly repairs and downtime. Cylinder oil seals help to maintain the proper oil levels and pressure within the cylinder, ensuring smooth operation and optimal performance.