Ultra-low saps lubricants for internal combustion engines

Abstract

Disclosed is an ultra-low SAPS lubricating oil composition comprising: an oil of lubricating viscosity; an aromatic dicarboxylic acid treated dispersant supplying at least 0.30 wt % of the aromatic dicarboxylic acid to said lubricating oil composition; an ashless peroxide decomposer present at a treat rate of from about 0.4 to 5.0 wt %; a metal deactivator wherein the metal deactivator is present at a treat rate of greater than 0.08 wt %; wherein said lubricating oil composition contains less than 1000 ppm sulfur, less than 300 ppm phosphorus and less than 0.25 wt % sulfated ash.

What is claimed is: 
     
         1 . An ultra-low SAPS lubricating oil composition comprising:
 an oil of lubricating viscosity;   an aromatic dicarboxylic acid treated dispersant supplying at least 0.30 wt % of the aromatic dicarboxylic acid to said lubricating oil composition;   an ashless peroxide decomposer present at a treat rate of from about 0.4 to 5.0 wt %;   a metal deactivator wherein the metal deactivator is present at a treat rate of greater than 0.08 wt %;   wherein said lubricating oil composition contains less than 1000 ppm sulfur, less than 300 ppm phosphorus and less than 0.25 wt % sulfated ash.   
     
     
         2 . The composition of  claim 1 , wherein the aromatic dicarboxylic acid treated dispersant is selected from an aromatic dicarboxylic acid treated bis-succinimide, an aromatic dicarboxylic acid treated mono-succinimide, or mixtures thereof. 
     
     
         3 . The composition of  claim 1 , wherein the aromatic dicarboxylic acid treated dispersant is a mono-succinimide. 
     
     
         4 . The composition of  claim 1 , wherein the aromatic dicarboxylic acid treated dispersantis a bis-succinimide. 
     
     
         5 . The composition of  claim 1 , wherein the aromatic dicarboxylic acid is selected from the group consisting of phthalic acid, isophthalic, and terephthalic acid, 
     
     
         6 . The composition of  claim 1 , wherein the aromatic dicarboxylic acid is terephthalic acid. 
     
     
         7 . The composition of  claim 1 , wherein the amount of aromatic dicarboxylic acid supplied to the lubricating oil composition is from 0.30 to 10 wt %. 
     
     
         8 . The composition of  claim 1 , wherein the amount of aromatic dicarboxylic acid supplied to the lubricating oil composition is from 0.35 to 7 wt %. 
     
     
         9 . The composition of  claim 1 , wherein the amount of aromatic dicarboxylic acid supplied to the lubricating oil composition is from 0.40 to 5 wt %. 
     
     
         10 . The composition of  claim 1 , wherein the amount of aromatic dicarboxylic acid supplied to the lubricating oil composition is from 0.45 to 3 wt %. 
     
     
         11 . The composition of  claim 1 , wherein the ashless peroxide decomposer is a compound according to formula 1: 
       
         
           
           
               
               
           
         
         wherein R 1  and R 2  and R 3  and R 4  are each independently selected from the group consisting of alkyl from 1 to 20 carbon atoms, more preferably alkyl from 1 to 10 carbon atoms and even more preferably lower alkyl from 1 to six carbon atoms. 
       
     
     
         12 . The composition of  claim 4 , wherein the ashless peroxide decomposer is N,N,N′,N′-tetramethyl-naphthalene-1,8-diamine. 
     
     
         13 . The composition of  claim 1 , wherein the metal deactivator is present at a treat rate of from about 0.08 to 3.0 wt %. 
     
     
         14 . The composition of  claim 1 , wherein the metal deactivator is selected from benzotriazole, tolyltriozole, and mixtures thereof. 
     
     
         15 . The composition of  claim 1 , wherein the metal deactivator is benzotriazole. 
     
     
         16 . The composition of  claim 1 , wherein the metal deactivator is tolyltriozole. 
     
     
         17 . The composition of  claim 1 , wherein said lubricating oil composition contains less than 800 ppm sulfur, less than 200 ppm phosphorous, and less than 0.20 wt % sulfated ash from the additive package. 
     
     
         18 . The composition of  claim 1 , wherein said lubricating oil composition contains less than 500 ppm sulfur, less than 100 ppm phosphorous, and less than 0.15 wt % sulfated ash from the additive package. 
     
     
         19 . The composition of  claim 1 , wherein said lubricating oil composition contains less than 300 ppm sulfur, less than 50 ppm phosphorous, and less than 0.10 wt % sulfated ash from the additive package. 
     
     
         20 . The composition of  claim 1 , wherein said lubricating oil composition contains less than 100 ppm sulfur, 0 ppm phosphorous, and less than 0.05 wt % sulfated ash from the additive package. 
     
     
         21 . The composition of  claim 1 , wherein said lubricating oil composition contains less than 50 ppm sulfur, 0 ppm phosphorus and less than 0.05 wt % sulfated ash from the additive package. 
     
     
         22 . A method of lubricating an engine with an ultra-low SAPS lubricating oil composition comprising:
 an oil of lubricating viscosity;   an aromatic dicarboxylic acid treated dispersant supplying at least 0.30 wt % of the aromatic dicarboxylic acid to said lubricating oil composition;   an ashless peroxide decomposer present at a treat rate of from about 0.4 to 5.0 wt %;   a metal deactivator wherein the metal deactivator is present at a treat rate of greater than 0.08 wt %;   wherein said lubricating oil composition contains less than 1000 ppm sulfur, less than 300 ppm phosphorus and less than 0.25 wt % sulfated ash.   
     
     
         23 . The method of  claim 22 , wherein the aromatic dicarboxylic acid treated dispersant is selected from an aromatic dicarboxylic acid treated bis-succinimide, an aromatic dicarboxylic acid treated mono-succinimide, or mixtures thereof. 
     
     
         24 . The method of  claim 22 , wherein the aromatic dicarboxylic acid treated dispersant is an aromatic dicarboxylic acid treated bis-succinimide. 
     
     
         25 . The method of  claim 22 , wherein the aromatic dicarboxylic acid treated dispersant is an aromatic dicarboxylic acid treated mono-succinimide. 
     
     
         26 . The method of  claim 22 , wherein the aromatic dicarboxylic acid is selected from the group consisting of phthalic acid, isophthalic, and terephthalic acid. 
     
     
         27 . The method of  claim 22 , wherein the aromatic dicarboxylic acid is terephthalic acid. 
     
     
         28 . The method of  claim 22 , wherein the amount of aromatic dicarboxylic acid supplied to the lubricating oil composition is from 0.30 to 10 wt %. 
     
     
         29 . The method of  claim 22 , wherein the amount of aromatic dicarboxylic acid supplied to the lubricating oil composition is from 0.35 to 7 wt %. 
     
     
         30 . The method of  claim 22 , wherein the amount of aromatic dicarboxylic acid supplied to the lubricating oil composition is from 0.40 to 5 wt %. 
     
     
         31 . The method of  claim 22 , wherein the amount of aromatic dicarboxylic acid supplied to the lubricating oil composition is from 0.45 to 3 wt %. 
     
     
         32 . The method of  claim 22 , wherein the ashless peroxide decomposer is a compound according to formula 1: 
       
         
           
           
               
               
           
         
         wherein R 1  and R 2  and R 3  and R 4  are each independently selected from the group consisting of alkyl from 1 to 20 carbon atoms, more preferably alkyl from 1 to 10 carbon atoms and even more preferably lower alkyl from 1 to six carbon atoms. 
       
     
     
         33 . The method of  claim 22 , wherein the ashless peroxide decomposer is N,N,N′,N′-tetramethyl-naphthalene-1,8-diamine. 
     
     
         34 . The method of  claim 22 , wherein the metal deactivator is present at a treat rate of from about 0.08 to 3.0 wt %. 
     
     
         35 . The method of  claim 22 , wherein the metal deactivator is selected from benzotriazole, tolyltriozole, and mixtures thereof. 
     
     
         36 . The method of  claim 22 , wherein the metal deactivator is benzotriazole. 
     
     
         37 . The method of  claim 22 , wherein the metal deactivator is tolyltriozole. 
     
     
         38 . The method of  claim 22 , wherein said lubricating oil composition contains less than 800 ppm sulfur, less than 200 ppm phosphorous, and less than 0.20 wt % sulfated ash from the additive package. 
     
     
         39 . The method of  claim 22 , wherein said lubricating oil composition contains less than 500 ppm sulfur, less than 100 ppm phosphorous, and less than 0.15 wt % sulfated ash from the additive package. 
     
     
         40 . The method of  claim 22 , wherein said lubricating oil composition contains less than 300 ppm sulfur, less than 0 ppm phosphorous, and less than 0.10 wt % sulfated ash from the additive package. 
     
     
         41 . The method of  claim 22 , wherein said lubricating oil composition contains less than 100 ppm sulfur, 0 ppm phosphorous, and less than 0.05 wt % sulfated ash from the additive package. 
     
     
         42 . The method of  claim 22 , wherein said lubricating oil composition contains less than 50 ppm sulfur, 0 ppm phosphorus and less than 0.05 wt % sulfated ash from the additive package. 
     
     
         43 . A method of making a low SAPS lubricating oil composition, comprising mixing together:
 an oil of lubricating viscosity;   an aromatic dicarboxylic acid treated dispersantsupplying at least 0.30 wt % aromatic dicarboxylic acid to said lubricating oil composition;   an ashless peroxide decomposer present at a treat rate of from about 0.4 to 5.0 wt %;   a metal deactivator wherein the metal deactivator is present at a treat rate of greater than 0.08 wt %;   wherein said lubricating oil composition contains less than 1000 ppm sulfur, less than 300 ppm phosphorus and less than 0.25 wt % sulfated ash.