Formulated for superior performance and corrosion protection in 4-stroke outboards& stern drive engines. Blended with premium quality base stocks and special additives that provide the ultimate in corrosion protection and reduce engine wear in demanding marine environments. Our SAE 10w-40 viscosity has been formulated for todayÃƒÂ¢Ã¢â€šÂ¬Ã¢â€žÂ¢s high tech 4-stroke outboards in all climates plus it is ideal for stern drive and inboard in cooler climates. Use with genuine Mallory marine oil filters for maximum engine protection. Meets or exceeds all engine manufacturers warranty requirements and is NMMA FC-W certified.