| 摘要 |
A multigrade lubricating oil composition exhibiting an acceptable low temperature performance as measured by a cold cranking simulator, having an ethylene alpha-olefin dispersant and a viscosity modifier selected from the group consisting of ethylene alpha-olefin copolymers, polyalkylacrylate polymers, hydrogenated diene polymers, hydrogenated diene styrene copolymers and mixtures thereof, wherein the dispersant has an ethylene content in the range of about 10 to 50 weight percent, preferably 30 to 50 weight percent; whereby the low temperature performance of the composition is superior to the low temperature performance of a control oil composition comprises a dispersant with an ethylene content of greater than about 50 weight percent. |
