SUPERON Hydraulic Oils are manufactured by carefully selected Group I and Group II base oils by special refining treatment and their natural stability is further improved by incorporating anti-foam, anti - oxidant, rust and corrosion inhibitors. These oils have better oxidation stability and provide good protection against rusting. In circulating systems hydraulic oils can be subjected to longer periods of time in oxidizing conditions such as high temperatures and relatively high exposure to air. Water often enters the systems by fluid leakage or condensation and even small amount of water will cause rusting of ferrous surfaces. SUPERON Hydraulic oils possess superior foam control, water separation and rapid air release properties.