Duragard Diamond Plate Zinc Free Excavator ISO-46 Low Aquatic Toxicity Hydraulic Fluid is formulated with premium quality, high-viscosity index (HVI) base oils and an outstanding high performance balanced zinc-free additive system. The anti-wear formulation has over 10,000 hours of oxidation stability with exceptional wear and corrosion protection, excellent water demulsibility and foam and aeration suppression. Duragard Diamond Plate Zinc Free Excavator ISO-46 Low Aquatic Toxicity Hydraulic Fluid is recommended for Hitachi and other manufacturers excavators with 10,000+ hour service intervals, Off-road mobile construction and forestry equipment, such as backhoes, bulldozers, crawlers, excavators, skid-steer loaders and motor graders, where the manufacturer recommends a zinc-free, low aquatic toxicity type, hydraulic oil.