Duragard Arctic Blue Hydraulic Fluid - 2.5 Gallon Jug Designed for operation in extreme cold temperatures Smoother operation  Excellent frictional control assures quiet and efficient action of hydraulic systems while reducing cavitaion and wear even under severe operating conditions of low or high temperature and high load. Reduced downtime  Year-round protection against ear, rust, corrosion, sludge, and foaming. Long oil life  High dielectric strength* for use in electric service bucket trucks. Extreme Low Temperature  Excellent low temperature properties for use in arctic conditions.