Mountfield MX855 universal 4-stroke lawnmower engine oil is a high performance oil formulated from a carefully balanced blend of mineral base stocks fortified with the latest additive technology. This lawnmower oil helps protect the engine’s moving parts keeping it clean as well as prolonging engine life. It meets A.P.I. SG/CF specifications and is suitable for use where an SAE-30, or 10W/40 viscosity is recommended.