METHOD FOR IMPROVING ENGINE FUEL EFFICIENCY
    6.
    发明公开
    METHOD FOR IMPROVING ENGINE FUEL EFFICIENCY 审中-公开
    一种提高发动机的燃油效率

    公开(公告)号:EP2780437A1

    公开(公告)日:2014-09-24

    申请号:EP12791652.6

    申请日:2012-11-13

    IPC分类号: C10M167/00

    摘要: A method for improving fuel efficiency, while maintaining or improving wear protection, in an engine lubricated with a lubricating oil by using as the lubricating oil a formulated oil having a HTHS viscosity of less than 2.6 cP at 150°C. The formulated oil has a composition that comprises a lubricating oil base stock as a major component, and zinc dialkyl dithio phosphate, a mixture of (i) at least two alkali metal detergents, (ii) at least two alkaline earth metal detergents, or (iii) one or more alkali metal detergents and one or more alkaline earth metal detergents; and a viscosity index improver, as minor components. A lubricating engine oil having a composition comprising a lubricating oil base stock as a major component, and a zinc dialkyl dithio phosphate, a mixture of (i) at least two alkali metal detergents, (ii) at least two alkaline earth metal detergents, or (iii) one or more alkali metal detergents and one or more alkaline earth metal detergents, e.g., magnesium sulfonate and calcium salicylate; and a viscosity index improver, as minor components. The lubricating oil has a HTHS viscosity of less than 2.6 cP at 150°C. The composition contains less than 2 weight percent of the viscosity index improver, based on the total weight of the formulated oil or lubricating engine oil. The composition is sufficient for the formulated oil or lubricating engine oil to pass wear protection requirements of one or more engine tests selected from TU3M, Sequence IIIG, Sequence IVA and OM646LA.