MILESYN SYNTHETIC BLEND MOTOR OIL 10w40 SN are designed to exceed the demanding lubrication requirements of today's naturally aspirated, turbo-charged and super charged gasoline engines. These oils are specially formulated to provide superior protection, resist oxidation, meet volatility requirements and protect against low speed pre-ignition for the new ILSAC SN Milesyn Synthetic Blend Motor Oil grades 5W-20, 5W-30, and 10W-30 meet the American Petroleum Institute's (API) highest performance Gasoline Engine Service category SN Plus. These viscosity grades are classified by API as "Energy Conserving" engine lubricants, and meet ILSAC SN. The 10w-40 viscosity grade meets the service category API SN. All viscosity grades are recommended for the requirements of previous categories SM, SF, SG, SH, and SJ.