Improved lubricant for natural gas engines

C - Chemistry – Metallurgy – 10 – M

Patent

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C10M 163/00 (2006.01)

Patent

CA 2732914

An engine fueled by natural gas may be lubricated by providing thereto a lubricant composition of an oil of lubricating viscosity, an overbased monovalent metal detergent in an amount to provide at least about 0.01 weight percent monovalent metal to the lubricant composition, wherein the monovalent metal comprises about 10 to about 30 percent by weight of the total metal content of the lubricant composition, an overbased divalent metal detergent, in an amount to provide at least about 0.005 percent by weight of the divalent metal to the lubricant composition, a dispersant, and a metal salt of a phosphorus acid. The lubricant composition has a sulfated ash of less than about 0.8 percent.

Linvention concerne un moteur alimenté au gaz naturel pouvant être lubrifié en utilisant une composition lubrifiante comprenant une huile de viscosité propre à la lubrification, un détergent surbasique à base de métal monovalent présent en une quantité permettant davoir au moins environ 0,01 % en poids de métal monovalent par rapport à la composition lubrifiante, ledit métal monovalent représente entre environ 10 et environ 30 % en poids de la teneur en métal totale de la composition lubrifiante, un détergent surbasique à base de métal divalent présent en une quantité permettant davoir au moins environ 0,005 % en poids de métal divalent par rapport à la composition lubrifiante, un dispersant, et un sel métallique dun acide phosphoreux. La teneur en cendre sulfatée de la composition lubrifiante est inférieure à environ 0,8 %.

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