Mobil DTE™ 20 Ultra Series oils are high performance anti-wear hydraulic oils with a long life and have demonstrated oil change intervals that are 2X longer than comparable competitive oils. These oils meet the stringent requirements of hydraulic systems using high-pressure, high-output pumps, as well as other hydraulic system components such as tight-tolerance servo valves and numerically controlled (NC) machine tools. The products in the series exhibit excellent oxidation and thermal stability to minimize deposits and ensure a long oil life in hydraulic systems under harsh operating conditions using high pressure and high output pumps. Keep-clean performance prevents deterioration of critical hydraulic system components such as the tight tolerance servo and proportional valves found in many modern hydraulic systems. These products meet the most stringent performance requirements of many hydraulic system and component manufacturers, allowing the use of a single product with excellent performance characteristics.