Motul 10W40 is a type of engine oil. The “10W” designation indicates its viscosity or thickness at different temperatures. The “10” refers to its viscosity when cold, and the “40” refers to its viscosity when hot. This type of oil is commonly used in a wide range of vehicles, including gasoline and diesel engines, and it provides good protection and lubrication under various operating conditions. Motul is a well-known brand in the automotive lubricants industry, offering a variety of oils and lubricants for different applications.