| 摘要 |
An oil additive concentrate comprising 1) a mixture of a graft and derivatized polymer and a mineral oil of lubricating viscosity said mixture characterized by comprising from about 5 to 35 weight percent of said polymer and the balance said mineral oil and having a bulk viscosity measured as the Kinematic Viscosity at 100.degree.C above about 2000 Centistokes, and 2) a minor amount of a co-solvent effective for substantially reducing the bulk viscosity of said mixture, said co-solvent being selected from the group represented by the formulas: a) <IMG> in which R represents hydrogen and a hydrocarbyl radical having from 1 to 25 carbon atoms and n has a value from 0 to 10, and b) <IMG> in which R represents a hydrocarbyl radical having from 1 to 12 carbon atoms and n has a value from 0 to 10, and a lubricating oil composition containing same is provided.
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