In industrial settings, hydraulic oil serves to lubricate, cool, and protect the various components within hydraulic systems, such as pumps, valves, motors, and actuators, which are operated by pressurized fluid. Lubrication is crucial for minimizing friction and wear on moving parts, enhancing system efficiency and extending its lifespan. Additionally, hydraulic oil functions as a coolant, helping dissipate the heat generated during operation and preventing overheating or damage to components.

Protection is another key role of hydraulic oil, as it prevents the accumulation of dirt, rust, and contaminants that could damage the system and reduce performance. It also guards against corrosion, oxidation, and other forms of wear. A high-quality hydraulic oil should exhibit good thermal stability and a high viscosity index, enabling it to retain its properties across a broad temperature range. This is particularly vital in industries where machinery operates under extreme temperatures and demanding conditions.