Lubricating oil composition

Abstract

The present invention is directed to a lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity (b) one or more lithium-containing detergents (c) one or more detergents other than a lithium-containing detergent (d) one or more anti-oxidants (e) one or more dispersants and (f) one or more anti-wear agents, wherein the lubricating oil composition contains no more than 0.1 weight percent of lithium-containing detergents and no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a calcium-containing detergent. The present invention is also directed to a lubricating oil composition comprising (a) an oil of lubricating viscosity (b) a lithium-containing detergent (c) a detergent other than a lithium-containing detergent (d) an amine-containing anti-oxidant (e) an ethylene carbonate treated dispersant and (f) a phosphorus-containing anti-wear agent, wherein the lubricating oil composition contains no more than 0.1 weight percent of lithium and no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a calcium-containing detergent. The present invention is also directed to method for reducing catalyst poisoning in exhaust after treatment systems in internal combustion engines, which comprises operating the engine with the lubricating oil compositions of the present invention.

1 . A lubricating oil composition comprising: 
 (a) a major amount of an oil of lubricating viscosity;    (b) a lithium-containing detergent;    (c) one or more detergents other than a lithium-containing detergent;    (d) one or more anti-oxidants;    (e) one or more dispersants; and    (f) one or more anti-wear agents;    wherein the lubricating oil composition contains no more than 0.1 weight percent of lithium and no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a calcium-containing detergent.    
   
   
       2 . The lubricating oil composition of  claim 1 , wherein the concentration of the lithium in the lubricating oil composition is less than 0.08 weight percent based on the total weight of the lubricating oil composition.  
   
   
       3 . The lubricating oil composition of  claim 2 , wherein the concentration of the lithium in the lubricating oil composition is less than 0.07 weight percent based on the total weight of the lubricating oil composition.  
   
   
       4 . The lubricating oil composition of  claim 3 , wherein the concentration of the lithium in the lubricating oil composition is 0.05 weight percent based on the total weight of the lubricating oil composition.  
   
   
       5 . The lubricating oil composition of  claim 1 , wherein the phosphorus content is in the range of 0.03 weight percent to about 0.12 weight percent based on the total weight of the lubricating oil composition.  
   
   
       6 . The lubricating oil composition of  claim 5 , wherein the phosphorus content is in the range of 0.05 weight percent to about 0.1 weight percent based on the total weight of the lubricating oil composition.  
   
   
       7 . The lubricating oil composition of  claim 6 , wherein the phosphorus content is in the range of 0.07 weight percent to about 0.09 weight percent based on the total weight of the lubricating oil composition.  
   
   
       8 . A lubricating oil composition comprising: 
 (a) a major amount of an oil of lubricating viscosity;    (b) a lithium-containing detergent;    (c) one or more detergents other than a lithium-containing detergent;    (d) an amine-containing anti-oxidant;    (e) an ethylene carbonate treated dispersant; and    (f) a phosphorus-containing anti-wear agent;    wherein the lubricating oil composition contains no more than 0.1 weight percent of lithium and no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a calcium-containing detergent.    
   
   
       9 . The lubricating oil composition of  claim 8 , wherein the concentration of the lithium in the lubricating oil composition is less than 0.08 weight percent based on the total weight of the lubricating oil composition.  
   
   
       10 . The lubricating oil composition of  claim 9 , wherein the concentration of the lithium in the lubricating oil composition is less than 0.07 weight percent based on the total weight of the lubricating oil composition.  
   
   
       11 . The lubricating oil composition of  claim 10 , wherein the concentration of the lithium-containing detergents in the lubricating oil composition is 0.05 weight percent based on the total weight of the lubricating oil composition.  
   
   
       12 . The lubricating oil composition of  claim 8 , wherein the phosphorus content is in the range of 0.03 weight percent to about 0.12 weight percent based on the total weight of the lubricating oil composition.  
   
   
       13 . The lubricating oil composition of  claim 12 , wherein the phosphorus content is in the range of 0.05 weight percent to about 0.1 weight percent based on the total weight of the lubricating oil composition.  
   
   
       14 . The lubricating oil composition of  claim 13 , wherein the phosphorus content is in the range of 0.07 weight percent to about 0.09 weight percent based on the total weight of the lubricating oil composition.  
   
   
       15 . The lubricating oil composition of  claim 8 , wherein the lithium-containing detergent is a lithium overbased phenate, a lithium overbased sulfurized phenate, an lithium overbased salicylates or a lithium overbased carboxylate.  
   
   
       16 . The lubricating oil composition of  claim 15 , wherein the lithium-containing detergent is a lithium overbased phenate, a lithium overbased sulfurized phenate.  
   
   
       17 . The lubricating oil composition of  claim 16 , wherein the lithium-containing detergent is a lithium overbased sulfurized phenate.  
   
   
       18 . The lubricating oil composition of  claim 8 , wherein the phosphorus-containing anti-wear agent is a metal di-alkyl di-thiophosphate.  
   
   
       19 . The lubricating oil composition of  claim 18 , wherein the metal in the metal di-alkyl di-thiophosphate is zinc.  
   
   
       20 . A lubricating oil concentrate comprising: 
 (a) from about 10 weight percent to about 90 weight percent an oil of lubricating viscosity based on the total weight of the lubricating oil concentrate;    (b) a lithium-containing detergent;    (c) one or more detergents other than a lithium-containing detergent;    (d) an amine-containing anti-oxidant;    (e) an ethylene carbonated treated dispersant; and    (f) a phosphorus-containing anti-wear agent;    wherein the lubricating oil concentrate contains no more than 0.1 weight percent of lithium and no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a calcium-containing detergent.    
   
   
       21 . The lubricating oil composition of  claim 20 , wherein the lithium-containing detergent is a lithium overbased sulfurized phenate.  
   
   
       22 . The lubricating oil composition of  claim 20 , wherein the phosphorus-containing anti-wear agent is zinc di-alkyl di-thiophosphate.  
   
   
       23 . A method for reducing catalyst poisoning in exhaust after treatment systems in internal combustion engines, which comprises operating the engine with a lubricating oil composition comprising: 
 (a) a major amount of an oil of lubricating viscosity;    (b) a lithium-containing detergent;    (c) one or more detergents other than a lithium-containing detergent;    (d) an amine-containing anti-oxidant and a phenolic anti-oxidant;    (e) an ethylene carbonate treated dispersant; and    (f) a phosphorus-containing anti-wear agent;    wherein the lubricating oil composition contains no more than 0.1 weight percent of lithium and no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a calcium-containing detergent.    
   
   
       24 . The method of  claim 23 , wherein the internal combustion engines are diesel engines, gasoline engines and natural gas engines.  
   
   
       25 . The lubricating oil composition of  claim 23 , wherein the lithium-containing detergent is a lithium overbased sulfurized phenate.  
   
   
       26 . The lubricating oil composition of  claim 23 , wherein the phosphorus-containing anti-wear agent is zinc di-alkyl di-thiophosphate.