A multi-purpose oil (UTTO), used for hydraulic and mechanical transmissions in agricultural and construction machinery. It possesses a high viscosity index to prevent both excessive viscosity when cold, which would cause a loss of power or defective greasing, and excessive fluidity when hot, which would lead to gear teeth wear. Its additive system ensures very good lubrication of gears and hydraulic controls, and also that immersed brakes work properly without chattering.