Synthetic, biodegradable high viscosity index (HV) hydraulic oils, based on petrochemical-derived synthetic unsaturated esters, and more than 80% renewable, which contribute to protecting and preserving the environment. Possess a high natural viscosity index, which reduces viscosity variations with temperature, and natural lubricity properties which contribute to reducing wear of lubricated components. May be used in hydraulic systems working at moderate temperatures (<90°C), as well as in systems working at low temperatures.