A lubricant for transmissions, specially formulated for automatic gearboxes equipped with a torque converter or a hydraulic coupler, requiring a fluid meeting FORD specification M2C 33 G. Possesses exceptional oxidation stability, and thereby reduces chemical and thermal alteration due to oxidation by atmospheric oxygen. Its very good anti-foaming properties prevent any overflow and oil loss which would be detrimental to the resistance of the gears. It contains additives aimed at giving it a very high viscosity index and remarkable anti-wear properties.