Turbo Star 15W-40 is a multigrade engine oil for diesel and gasoline engines. The SAE 15W-40 viscosity range ensures reliable cold starting and high-temperature resistance throughout the year, even under extreme loads. Shear-stable additives ensure the SAE 15W-40 viscosity is maintained throughout the full oil life. Our selected combination of high-quality base oils and additives provides excellent wear protection and outstanding engine cleanliness; the formation of black sludge is prevented.