A lubricating oil composition having a sulfur content of up to about 0.4 wt. % and a sulfated ash content of up to about 0.5 wt. % as determined by ASTM D874 is disclosed which comprises (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron
A lubricating oil composition having a sulfur content of up to about 0.4 wt. % and a sulfated ash content of up to about 0.5 wt. % as determined by ASTM D874 is disclosed which comprises (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron-containing compound having no more than about 400 ppm of boron; and (c) at least one oil-soluble or dispersed oil-stable molybdenum-containing compound having at least about 1100 ppm of molybdenum, based upon the total mass of the composition; wherein the lubricating oil composition has a ratio of sulfur to molybdenum of less than or equal to about 4:1.
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1. A lubricating oil composition having a sulfur content of up to about 0.4 wt. % and a sulfated ash content of up to about 0.5 wt. % as determined by ASTM D874 and comprising (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron-containing
1. A lubricating oil composition having a sulfur content of up to about 0.4 wt. % and a sulfated ash content of up to about 0.5 wt. % as determined by ASTM D874 and comprising (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron-containing compound selected from the group consisting of a borated dispersant, a borated calcium sulfonate, a borated friction modifier and mixtures thereof and having from about 40 ppm to no more than about 400 ppm of boron, based upon total mass of the composition; and (c) at least one oil-soluble or dispersed oil-stable, molybdenum succinimide complex having at least about 1100 ppm of molybdenum, based upon the total mass of the composition; wherein the lubricating oil composition has a ratio of sulfur to molybdenum of about 1.9:1 to less than or equal to about 4:1, and further wherein the sulfur content is derived from a sulfur compound selected from the group consisting of an ashless dithiocarbamate, sulfurized ester and a thiadiazole compound. 2. The lubricating oil composition of claim 1, wherein the oil of lubricating viscosity is comprised of a mineral base oil. 3. The lubricating oil composition of claim 1, having a ratio of sulfur to molybdenum of about 1.9:1 to less than about 3:1. 4. The lubricating oil composition of claim 1, having a ratio of sulfur to molybdenum of about 1.9:1 to about 2.5:1. 5. The lubricating oil composition of claim 1, wherein the oil soluble or dispersed oil-stable molybdenum succinimide complex is a sulfurized or non-sulfurized molybdenum polyisobutenyl succinimide complex. 6. The lubricating oil composition of claim 1, wherein the sulfur is derived from an ashless dithiocarbamate. 7. The lubricating oil composition of claim 1 wherein the sulfur is derived from a bisdithiocarhamate compound of the Formula: wherein R13, R14, R15, and R16 are the same or different and are aliphatic hydrocarbyl groups having 1 to 13 carbon atoms and R17 is an alkylene group having 1 to 8 carbon atoms. 8. The lubricating oil composition of claim 1, having a sulfated ash content of up to about 0.4 wt. % as determined by ASTM D874. 9. The lubricating oil composition of claim 1, which is substantially free of phosphorus. 10. The lubricating oil composition of claim 1, which is substantially free of zinc dialkyl dithiophosphate. 11. The lubricating oil composition of claim 1, further comprising at least one additive selected from the group consisting of metallic detergents, ashless dispersants, friction modifiers, extreme pressure agents, viscosity index improvers and pour point depressants. 12. A method of operating an internal combustion engine comprising the step of operating the internal combustion engine with a lubricating oil composition having a sulfur content of up to about 0.4 wt. % and a sulfated ash content of up to about 0.5 wt. % as determined by ASTM D874 and comprising (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron-containing compound selected from the group consisting of a borated dispersant, a borated calcium sulfonate, a borated friction modifier and mixtures thereof and having from about 40 ppm to no more than about 400 ppm of boron, based upon the total mass of the composition; and (e) at least one oil-soluble or dispersed oil-stable molybdenum succinimide complex having at least about 1100 ppm of molybdenum, based upon the total mass of the composition; wherein the lubricating oil composition has a ratio of sulfur to molybdenum of about 1.9:1 to less than or equal to about 4:1, and further wherein the sulfur content is derived from a sulfur compound selected from the group consisting of an ashless dithiocarbamate, a sulfurized ester and a thiadiazole compound. 13. The method of claim 12, wherein the lubricating oil composition has a ratio of sulfur to molybdenum of about 1.9:1 to about 2.5:1. 14. The method of claim 12, wherein the oil-soluble or dispersed oil-stable molybdenum succinimide complex is a sulfurized or non-sulfurized molybdenum polyisobutenyl succinimide complex. 15. The method of claim 12, wherein the sulfur of the lubricating oil composition is derived from an ashless dithiocarbamate. 16. The method of claim 12, wherein the sulfur of the lubricating oil composition is derived from a bisdithiocarbamate compound of the Formula: wherein R13, R14, R15, and R16 are the same or different and are aliphatic hydrocarbyl groups having 1 to 13 carbon atoms and R17 is an alkylene group having 1 to 8 carbon atoms. 17. The method of claim 12, wherein the lubricating oil composition has a sulfated ash content of up to about 0.4 wt. % as determined by ASTM D874. 18. The method of claim 12, wherein the lubricating oil composition is substantially free of phosphorus. 19. The method of claim 12, wherein the lubricating oil composition is substantially free of zinc dialkyl dithiophosphate. 20. An internal combustion engine lubricated with the lubricating oil composition of claim 1. 21. The lubricating oil composition of claim 1, wherein the borated dispersant is selected from the group consisting of a borated polyalkenyl succinic anhydride, a borated polyalkenyl succinimide and mixtures thereof. 22. The lubricating oil composition of claim 1, wherein the borated friction modifier is selected from the group consisting of a borated fatty epoxide, a borated alkoxylated fatty amine, a borated glycerol ester and mixtures thereof. 23. The method of claim 12, wherein the borated dispersant is selected from the group consisting of a borated polyalkenyl succinic anhydride, a borated polyalkenyl succinimide and mixtures thereof. 24. The method of claim 12, wherein the borated friction modifier is selected from the group consisting of a borated fatty epoxide, a borated alkoxylated fatty amine, a borated glycerol ester and mixtures thereof.
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이 특허에 인용된 특허 (24)
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