ADDITIVE LUBRICANT OIL COMPOSITION AND LUBRICANT OIL COMPOSITION UNDERSTANDING PROPILENE COPOLYMER AND A LUBRICANT OIL BASIS

摘要

viscosity modifier for lubricating oils, additive composition for lubricating oils, and lubricating oil composition. It is an object to provide a lubricating oil composition having low temperature and high temperature fuel efficiency properties that are superior to conventional lubricating oil compositions, and providing a viscosity modifier for lubricating oils and an additive composition for lubricating oils which are used to obtain said composition. The viscosity modifier for the lubricating oils of the present invention comprises a propylene copolymer (a) having a density of 875kg / m3 or less and comprising 60 mol% or more of propylene derived structural unit.