A UTTO oil ensuring both lubrication of mechanical transmissions (gearboxes, transfer boxes, power take-offs, front and rear axles, final drives, clutches and immersed brakes) and of hydraulic circuits in CASE - INTERNATIONAL HARVESTER construction machinery. It contains extreme pressure additives which retain the protective film and reduce shearing effects on the gears, even under load. Its anti-wear and anti-corrosion properties ensure the gear protection. Its anti-foaming properties help prevent oil overflow and losses, which would be detrimental to the resistance of the gears. It possesses a friction modifier ensuring that immersed brakes work without chattering or squeaking.