Duragard SAE 30WT Single Grade Heavy Duty Engine & Transmission Oil is specially formulated with a select High Viscosity Index (HVI) Group-II Hydro-cracked base oils combined with potent detergent dispersants, anti-wear additives, anti-oxidants, defoamers, and pour point depressant compounds that provide superior low temperature fluidity and extraordinary high temperature film strength to prevent metal-to-metal contact. Duragard SAE 30WT Single Grade Heavy Duty Engine & Transmission Oil meets the performance requirements of typical of API SN PLUS and can be used in applications where a 30WT Single Grade API SN PLUS, API CF, or API CF-2 fluid is specified. Recommended for older diesel engines.