Boron free automotive gear oil

Abstract

The present invention provides a boron-free oil soluble lubricant additive package having a succinimide dispersant, an antiwear agent, and an extreme pressure agent, with a total phosphorus content of 500 ppm or less. The lubricating oils of this invention can pass both the ISOT and L60-1 tests, even in the absence of boron.

1 . An oil soluble lubricant additive package comprising: 
 (a) a succinimide dispersant,    (b) an antiwear agent,    (c) an extreme pressure additive, wherein the weight ratio of said dispersant to said extreme pressure additive is from about 1:7 to about 1:2, and wherein the package is boron-free, and wherein the total phosphorus content of the package is not more than about 500 ppm.    
     
     
         2 . The oil soluble lubricant additive package according to  claim 1 , wherein said dispersant is selected from the group consisting of: one or more of succinimide dispersants, succinamides, succinic esters, and succinic ester-amides.  
     
     
         3 . The oil soluble lubricant additive package according to  claim 1 , wherein said extreme pressure additive is selected from the group consisting of sulfurized olefins, sulfurized fatty acid esters, and alkyl polysulfides.  
     
     
         4 . A lubricating oil comprising: 
 (a) a base oil; and    (b) the oil soluble lubricant additive package of  claim 1 .    
     
     
         5 . The lubricating oil according to  claim 4 , wherein said lubricating oil achieves a satisfactory score on at least one test selected from the group consisting of: ISOT test and L60-1 test.  
     
     
         6 . A machine lubricated by the lubricating oil of  claim 4 .  
     
     
         7 . The machine according to  claim 6 , wherein said machine is selected from the group consisting of vehicular axle gears and vehicular transmission gears.  
     
     
         8 . A vehicle comprising the oil soluble lubricating additive package of  claim 1 .  
     
     
         9 . A method for lubricating an axle assembly, said method comprising the steps of: 
 at least partially filling said axle assembly with a lubricant comprising the oil soluble lubricant additive package of  claim 1 .    
     
     
         10 . A method for lubricating at least one moving part, said method comprising the steps of: 
 contacting at least one said moving part with a lubricant comprising the oil soluble lubricant additive package of  claim 1 .    
     
     
         11 . An oil soluble lubricant additive package comprising: 
 (a) a dispersant comprising no more than about 500 ppm of phosphorus, wherein said dispersant is substantially free of boron; and    (b) at least one inhibitor, wherein the weight ratio of said inhibitor to said dispersant is from about 1:17 to about 4:5.    
     
     
         12 . The oil soluble lubricant additive package according to  claim 11 , wherein said dispersant is selected from the group consisting of: one or more of various types of ashless dispersants including succinimides, succinamides, succinic esters, and succinic ester-amides.  
     
     
         13 . The oil soluble lubricant additive package according to  claim 11 , wherein at least one said inhibitor is selected from the group consisting of: corrosion inhibitors and oxidation inhibitors.  
     
     
         14 . The oil soluble lubricant additive package according to  claim 11 , wherein at least one said inhibitor is selected from the group consisting of thiadiazoles and triazoles.  
     
     
         15 . A lubricating oil comprising: 
 (a) a base oil; and    (b) the oil soluble lubricant additive package of  claim 11 .    
     
     
         16 . The lubricating oil according to  claim 15 , wherein said lubricating oil achieves a satisfactory score on at least one test selected from the group consisting of: ISOT test and L60-1 test.  
     
     
         17 . A machine lubricated by the lubricating oil of  claim 15 .  
     
     
         18 . The machine according to  claim 17 , wherein said machine is selected from the group consisting of automotive gear assemblies and automotive transmission assemblies.  
     
     
         19 . A vehicle comprising the oil soluble lubricating additive package of  claim 11 .  
     
     
         20 . A method for lubricating an axle assembly, said method comprising the steps of: 
 at least partially filling said axle assembly with a lubricant comprising the oil soluble lubricant additive package of  claim 11 .    
     
     
         21 . A method for lubricating at least one moving part, said method comprising the steps of: 
 contacting at least one said moving part with a lubricant comprising the oil soluble lubricant additive package of  claim 11 .    
     
     
         22 . An oil soluble lubricant additive package comprising: 
 (a) a dispersant comprising no more than about 500 ppm of phosphorus, wherein said dispersant is substantially free of boron; and    (b) at least one antiwear agent, wherein the weight ratio of said dispersant to said antiwear agent is from about 10:1 to about 2:1.    
     
     
         23 . The oil soluble lubricant additive package according to  claim 22 , wherein said dispersant is selected from the group consisting of: one or more of various types of ashless dispersants including succinimides, succinamides, succinic esters, and succinic ester-amides.  
     
     
         24 . The oil soluble lubricant additive package according to  claim 22 , wherein at least one antiwear agent is selected from the group consisting of: dihydrocarbyl polysulphides; sulphurized olefins; sulphurized fatty acid esters of both natural and synthetic origins; trithiones; sulphurized thienyl derivatives; sulphurized terpenes; sulphurized oligomers of C2-C8 monoolefins; and sulphurized Dieis-Alder adducts.  
     
     
         25 . A lubricating oil comprising: 
 (a) a base oil; and    (b) the oil soluble lubricant additive package of  claim 22 .    
     
     
         26 . The lubricating oil according to  claim 25 , wherein said lubricating oil achieves a satisfactory score on at least one test selected from the group consisting of: ISOT test and L60-1 test.  
     
     
         27 . A machine lubricated by the lubricating oil of  claim 25 .  
     
     
         28 . The machine according to  claim 27 , wherein said machine is selected from the group consisting of vehicular axle gears and vehicular transmission gears.  
     
     
         29 . A vehicle comprising the oil soluble lubricating additive package of  claim 22 .  
     
     
         30 . A method for lubricating an axle assembly, said method comprising the steps of: 
 at least partially filling said axle assembly with a lubricant comprising the oil soluble lubricant additive package of  claim 22 .    
     
     
         31 . A method for lubricating at least one moving part, said method comprising the steps of: 
 contacting at least one said moving part with a lubricant comprising the oil soluble lubricant additive package of  claim 22 .    
     
     
         32 . An oil soluble lubricant additive package comprising: 
 (a) a dispersant comprising no more than about 500 ppm of phosphorus, wherein said dispersant is substantially free of boron; and    (b) at least one antifoam agent, wherein the weight ratio of said dispersant to said antifoam agent is from about 30:1 to about 5:1.    
     
     
         33 . The oil soluble lubricant additive package according to  claim 32 , wherein said dispersant is selected from the group consisting of: one or more of various types of ashless dispersants including succinimides, succinamides, succinic esters, and succinic ester-amides.  
     
     
         34 . The oil soluble lubricant additive package according to  claim 32 , wherein at least one antifoam agent is selected from the group consisting of siloxane-containing polymers.  
     
     
         35 . A lubricating oil comprising: 
 (a) a base oil; and    (b) the oil soluble lubricant additive package of  claim 32 .    
     
     
         36 . The lubricating oil according to  claim 35 , wherein said lubricating oil achieves a satisfactory score on at least one test selected from the group consisting of: ISOT test and L60-1 test.  
     
     
         37 . A machine lubricated by the lubricating oil of  claim 35 .  
     
     
         38 . The machine according to  claim 37 , wherein said machine is selected from the group consisting of: vehicular axle gears and vehicular transmission gears.  
     
     
         39 . A vehicle comprising the oil soluble lubricating additive package of  claim 32 .  
     
     
         40 . A method for lubricating an axle assembly, said method comprising the steps of: 
 at least partially filling said axle assembly with a lubricant comprising the oil soluble lubricant additive package of  claim 32 .    
     
     
         41 . A method for lubricating at least one moving part, said method comprising the steps of: 
 contacting at least one said moving part with a lubricant comprising the oil soluble lubricant additive package of  claim 32 .    
     
     
         42 . The lubricating oil according to  claim 4 , wherein said lubricating oil achieves a satisfying score on the ISOT test and the L60-1 test.  
     
     
         43 . The lubricating oil according to  claim 15 , wherein said lubricating oil achieves a satisfying score on the ISOT test and the L60-1 test.  
     
     
         44 . The lubricating oil according to  claim 25 , wherein said lubricating oil achieves a satisfying score on the ISOT test and the L60-1 test.  
     
     
         45 . The lubricating oil according to  claim 35 , wherein said lubricating oil achieves a satisfying score on the ISOT test and the L60-1 test.