| 摘要 |
An additive concentrate, lubricant composition, and method of operating a diesel engine on the lubricant composition wherein the lubricant composition exhibits extended service life. The concentrate and lubricant composition include a sulfonate detergent and a phenate detergent, wherein the phenate detergent is present in an amount that is greater than 15 percent by weight of the total weight of detergents in the lubricant composition, and an antioxidant selected from hindered phenolic derivatives of C3 to C6 acids and C7 to C9 esters of hindered phenolic derivatives of C3 to C6 acids. The lubricant composition is substantially devoid of zinc dialkyldithiophosphate compounds.
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