Synthetic hydrocarbonic with a complex of highly effective additives. It is efficient in the range of temperatures from-50 to +200 °С. Apply it in heat-stressed gas-turbine engines of military and civil aircraft with oil temperature on an exit from the engine to 200 °С, and also in aviation cooling turbines as unified copra oils and in other units, in particular, in gas transporting units with a drive from the aviation engine. It is possible to use for incontinuous preservation.