摘要 |
Internal combustion engines exhibit improved efficiency of the emissions control system by using a lubricating oil composition of a base oil, an alkali or alkaline earth metal-containing detergent; a metal salt of one or more phosphorus-containing compounds represented by the formula (I) , wherein X<1> and X<2> are independently O or S, and R<1> and R<2> are independently hydrocarbyl groups, the average total number of carbon atoms in R<1> and R<2> for the one or more phosphorus-containing compounds being at least 10.4; and an acylated nitrogen-containing compound having at least about 10 alphatic carbon atoms and a TBN of at least about 2; the lubricating oil composition being characterized by a phosphorus concentration of up to about 0.12% by weight and the substantial absence of copper, thereby generating a lean-phosphorus containing exhaust gas. |
申请人 |
THE LUBRIZOL CORPORATION;WILK, MELODY, A.;CHAMBERLIN, WILLIAM, B., III;KELLEY, JACK, C.;ABRAHAM, WILLIAM, D. |
发明人 |
WILK, MELODY, A.;CHAMBERLIN, WILLIAM, B., III;KELLEY, JACK, C.;ABRAHAM, WILLIAM, D. |