| 摘要 |
PROBLEM TO BE SOLVED: To provide an additive package for an internal combustion engine crankcase and a lubricating oil composition containing the same, especially an additive package for an internal combustion engine crankcase, having improved additive stability.SOLUTION: An additive package for an internal combustion engine crankcase lubricating oil composition comprises or is made by admixing: (A) 5-99.4 mass%, based on the mass of the additive package, of a diluent oil of lubricating viscosity; and (B) the following additives: (B1) 0.1-10 mass% of a polymeric friction modifier, on an active matter basis, based on the mass of the additive package, in which the polymeric friction modifier is the reaction product of (a) a functionalized polyolefin, (b) a polyether, (c) a polyol, and (d) a monocarboxylic acid chain terminating group, (B2) 0.5-10 mass%, on an active matter basis, based on the mass of the additive package, of one or more ashless organic friction modifiers that include a polar terminal group covalently bonded to a monomeric oleophilic hydrocarbon chain. |
