Miles Hydro - Syn ISO 68 thetic Series is utilizes advanced synthetic base fluids and additives to provide biodegradability without sacrificing performance. This advanced technology formulation has a long fluid life even in severe operating conditions, and offers excellent resistance against wear, corrosion and carbon deposits. TYPICAL PROPERTIES: Grade 68, Viscosity cSt @ 40°C 66.3, Oxidation Stability 10000+, Color (D1500)