Truck fleet fuel economy by the use of optimized engine oil, transmission fluid, and gear oil

Abstract

The lubricant system of the present disclosure comprises an engine oil comprising at least one additive chosen from a viscosity index improver, a dispersant, a detergent, an antioxidant, and an antiwear compound; a transmission fluid comprising at least one additive chosen from a dispersant and a pour-point depressant; and a gear oil comprising at least one additive chosen from a viscosity index improver, an extreme pressure agent, and a dispersant. There is also disclosed a method of improving fuel economy of a vehicle comprising providing to the vehicle the disclosed lubricant system.

1 . A lubricant system comprising:
 an engine oil comprising at least one additive chosen from a viscosity index improver, a dispersant, a detergent, an antioxidant, and an antiwear compound;   a transmission fluid comprising at least one additive chosen from a dispersant and a pour-point depressant; and   a gear oil comprising at least one additive chosen from a viscosity index improver, an extreme pressure agent, and a dispersant.   
   
   
       2 . The lubricant system of  claim 1 , wherein the lubricant system can provide an improved fuel economy as compared to a lubricant system that is devoid of at least one of the engine oil, the transmission fluid, and the gear oil. 
   
   
       3 . The lubricant system of  claim 1 , wherein the dispersant comprises at least one of succinimide, boron-containing succinimide, phosphorus-containing succinimide, succinic acid ester, succinic ester-amides, Mannich base, hydrocarbyl polyamine, polymeric polyamine, functionalized olefin copolymer, and polyalkyl (meth)acrylate copolymers. 
   
   
       4 . The lubricant system of  claim 1 , wherein the detergent is selected from the group consisting of sulfonates, phenates, sulfurized phenates, carboxylates, salicylates, thiophosphonates, naphthenates of a metal, and combinations thereof. 
   
   
       5 . The lubricant system of  claim 1 , wherein the antioxidant is selected from the group consisting of phenolic antioxidants, hindered phenolic antioxidants, additional sulfurized olefins, aromatic amine antioxidants, secondary aromatic amine antioxidants, sulfurized phenolic antioxidants, oil-soluble copper compounds, and mixtures thereof. 
   
   
       6 . The lubricant system of  claim 1 , wherein the antiwear compound comprises zinc salts of dithioorganophosphates. 
   
   
       7 . The lubricant system of  claim 1 , wherein the pour-point depressant is selected from the group consisting of polymethacrylates; polyacrylates; condensation products of haloparaffin waxes and aromatic compounds; vinyl carboxylate polymers; and terpolymers of dialkylfumarates, vinyl esters of fatty acids, alkyl vinyl ethers, and mixtures thereof; ethylene-vinyl acetate copolymers; and alkyl phenol formaldehyde condensation resins. 
   
   
       8 . The lubricant system of  claim 1 , wherein the viscosity index improver is selected from the group consisting of olefin (co) polymer(s), polyalkyl (meth) acrylate(s), vinyl aromatic-diene copolymer, and mixtures thereof. 
   
   
       9 . The lubricant system of  claim 1 , wherein the extreme pressure agent is chosen from at least one of sulfur-containing additives, esters of boron acids, esters of phosphorus acids, amine salts of phosphorus acids and acid esters, higher carboxylic acids, and chlorine-containing additives. 
   
   
       10 . The lubricant system of  claim 1 , wherein the engine oil further comprises at least one of friction modifiers, anti-foamers, diluents, and pour-point depressants. 
   
   
       11 . The lubricant system of  claim 1 , wherein the transmission fluid further comprises at least one of detergents, antiwear compounds, antioxidants, friction modifiers, anti-foamers, and diluents. 
   
   
       12 . The lubricant system of  claim 1 , wherein the gear oil further comprises at least one of detergents, demulsifiers, antioxidants, friction modifiers, anti-foamers, diluents, and phosphorus-containing compounds. 
   
   
       13 . The lubricant system of  claim 1 , comprising an engine lubricated with the engine oil, a transmission lubricated with the transmission fluid, and a gear set lubricated with the gear oil. 
   
   
       14 . A class 8 over-the-road diesel truck comprising the lubricant system of  claim 13 . 
   
   
       15 . The lubricant system of  claim 1 , wherein the transmission fluid is chosen from an automatic transmission fluid, a manual transmission fluid, a dual clutch transmission fluid, and a continuously variable transmission fluid. 
   
   
       16 . A method of improving fuel economy of a vehicle comprising:
 providing to the vehicle a lubricant system comprising:
 an engine oil comprising at least one additive chosen from a viscosity index improver, a dispersant, a detergent, an antioxidant, and an antiwear compound; 
 a transmission fluid comprising at least one additive chosen from a dispersant and a pour-point depressant; and 
 a gear oil comprising at least one additive chosen from a viscosity index improver, an extreme pressure agent, and a dispersant. 
   
   
   
       17 . The method of  claim 16 , wherein the engine oil further comprises at least one of friction modifiers, anti-foamers, diluents, and pour-point depressants. 
   
   
       18 . The method of  claim 16 , wherein the transmission fluid further comprises at least one of detergents, antiwear compound, antioxidants, friction modifiers, anti-foamers, and diluents. 
   
   
       19 . The method of  claim 16 , wherein the gear oil further comprises at least one of detergents, demulsifiers, antioxidants, friction modifiers, anti-foamers, diluents, and phosphorus-containing compound. 
   
   
       20 . The method of  claim 16 , wherein the vehicle is a class 8 over-the-road diesel truck. 
   
   
       21 . A multi-component kit comprising:
 a first component comprising an engine oil comprising at least one additive chosen from a viscosity index improver, a dispersant, a detergent, an antioxidant, and an antiwear compound;   a second component comprising a transmission fluid comprising at least one additive chosen from a dispersant and a pour-point depressant; and   a third component comprising a gear oil comprising at least one additive chosen from a viscosity index improver, an extreme pressure agent, and a dispersant.   
   
   
       22 . The multi-component kit of  claim 21 , wherein the engine oil further comprises at least one of friction modifiers, anti-foamers, diluents, and pour-point depressants. 
   
   
       23 . The multi-component kit of  claim 21 , wherein the transmission fluid further comprises at least one of detergents, antiwear compounds, antioxidants, friction modifiers, anti-foamers, and diluents. 
   
   
       24 . The multi-component kit of  claim 21 , wherein the gear oil further comprises at least one of detergents, demulsifiers, antioxidants, friction modifiers, anti-foamers, diluents, and phosphorus-containing compounds.