Lubricating oil compositions with engine corrosion protection

Abstract

A method for improving corrosion resistance, while maintaining or improving fuel efficiency, in an engine or other mechanical component lubricated with a lubricating oil by using as the lubricating oil a formulated oil. The formulated oil has a composition comprising a lubricating oil base stock as a major component, and at least one friction modifier having an elemental composition comprising one or more of nitrogen (N), oxygen (O), and phosphorus (P), as a minor component. The formulated oil has a corrosion factor, based on the elemental composition of the at least one friction modifier, of less than 500, as determined by the formula: 12900(N wt %)+3967(O wt %)−8524(P wt %)−250=corrosion factor. The lubricating oils are useful as passenger vehicle engine oils (PVEO) and commercial vehicle engine oils (CVEO).

1 . A method for improving corrosion resistance, while maintaining or improving fuel efficiency, in an engine or other mechanical component lubricated with a lubricating oil by using as the lubricating oil a formulated oil, said formulated oil having a composition comprising a lubricating oil base stock as a major component; and at least one friction modifier having an elemental composition comprising one or more of nitrogen (N), oxygen (O), and phosphorus (P), as a minor component; wherein said formulated oil has a corrosion factor, based on the elemental composition of the at least one friction modifier, of less than 500, as determined by the formula:
   12900(N wt %)+3967(O wt %)−8524(P wt %)−250=corrosion factor
   
       and wherein corrosion resistance is improved and fuel efficiency is maintained or improved as compared to corrosion resistance and fuel efficiency achieved using a lubricating oil containing a minor component other than the at least one friction modifier, or having a corrosion factor of greater than 500. 
     
     
         2 . The method of  claim 1  wherein said formulated oil has a corrosion factor, based on the elemental composition of the at least one friction modifier, of less than 400. 
     
     
         3 . The method of  claim 1  wherein said formulated oil has a corrosion factor, based on the elemental composition of the at least one friction modifier, of less than 200. 
     
     
         4 . The method of  claim 1  wherein said formulated oil has a corrosion factor, based on the elemental composition of the at least one friction modifier, of less than 100. 
     
     
         5 . The method of  claim 1  wherein said formulated oil has a corrosion factor, based on the elemental composition of the at least one friction modifier, of less than 50. 
     
     
         6 . The method of  claim 1  wherein the lubricating oil base stock comprises a Group I, Group II, Group III, Group IV or Group V base oil. 
     
     
         7 . The method of  claim 1  wherein the at least one friction modifier comprises an inorganic compound, an alkoxylated fatty acid ester, an alkanolamide, a polyol fatty acid ester, a borated glycerol fatty acid ester, a fatty alcohol ether, or mixtures thereof. 
     
     
         8 . The method of  claim 7  wherein the inorganic compound comprises molybdenum amine, molybdenum diamine, an organotungstenate, a molybdenum dithiocarbamate, molybdenum dithiophosphates, molybdenum amine complexes, molybdenum carboxylates, or mixtures thereof. 
     
     
         9 . The method of  claim 7  wherein the alkoxylated fatty acid ester comprises polyoxyethylene stearate, fatty acid polyglycol ester, polyoxypropylene stearate, polyoxybutylene stearate, polyoxyethylene isosterate, polyoxypropylene isostearate, polyoxyethylene palmitate, or mixtures thereof. 
     
     
         10 . The method of  claim 7  wherein the alkanolamide comprises lauric acid diethylalkanolamide, palmic acid diethylalkanolamide, oleic acid diethyalkanolamide, stearic acid diethylalkanolamide, oleic acid diethylalkanolamide, polyethoxylated hydrocarbylamides, polypropoxylated hydrocarbylamides, or mixtures thereof. 
     
     
         11 . The method of  claim 7  wherein the polyol fatty acid ester comprises glycerol mono-oleate, saturated mono-, di-, and tri-glyceride esters, glycerol mono-stearate, polyol esters, hydroxyl-containing polyol esters, or mixtures thereof. 
     
     
         12 . The method of  claim 7  wherein the borated glycerol fatty acid ester comprises borated glycerol mono-oleate, borated saturated mono-, di- and tri-glyceride esters, borated glycerol mono-sterate, polyol monocarboxylate esters, polyol dicarboxylate esters, polyoltricarboxylate esters, glycerol mono-oleates, glycerol dioleates, glycerol trioleates, glycerol monostearates, glycerol distearates, glycerol tristearates, glycerol monopalmitates, glycerol dipalmitates, glycerol tripalmitates, isostearates, linoleates, ethoxylated, propoxylated, butoxylated fatty acid esters of polyols, or mixtures thereof. 
     
     
         13 . The method of  claim 7  wherein fatty alcohol ether comprises stearyl ether, myristyl ether, ethoxylated, propoxylated, or butoxylated fatty alkyl ethers, stearyl, myristyl, C 11 -C 13  hydrocarbon, oleyl, isosteryl, alcohol ethers, or mixtures thereof. 
     
     
         14 . The method of  claim 1  wherein the elemental composition of said at least one friction modifier is linked, associated or correlated to corrosion resistance of said formulated oil as determined by lead (Pb) loss according to high temperature corrosion bench test (HTCBT) in conformity with ASTM D6594. 
     
     
         15 . The method of  claim 1  wherein the elemental composition of said at least one friction modifier is linked, associated or correlated to corrosion resistance of said formulated oil as determined by connecting rod bearing weight loss according to a modified Sequence VIII engine test in conformity with ASTM D6709. 
     
     
         16 . The method of  claim 1  wherein the corrosion resistance of said formulated oil as determined by lead (Pb) loss according to high temperature corrosion bench test (HTCBT) in conformity with ASTM D6594, is linked, associated or correlated to corrosion resistance of said formulated oil as determined by connecting rod bearing weight loss according to a modified Sequence VIII engine test in conformity with ASTM D6709, based on the elemental composition of the at least one friction modifier and the corrosion factor. 
     
     
         17 . The method of  claim 1  wherein the at least one friction modifier is present in an amount of from 0.01 weight percent to 5 weight percent, based on the total weight of the formulated oil. 
     
     
         18 . The method of  claim 1  wherein the lubricating oil base stock is present in an amount of from 50 weight percent to 95 weight percent, based on the total weight of the formulated oil. 
     
     
         19 . The method of  claim 1  wherein the formulated oil further comprises one or more of an antiwear additive, viscosity modifier, antioxidant, detergent, dispersant, pour point depressant, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, and anti-rust additive. 
     
     
         20 . The method of  claim 1  wherein the lubricating oil is a passenger vehicle engine oil (PVEO) or a commercial vehicle engine oil (CVEO). 
     
     
         21 . A lubricating oil having a composition comprising a lubricating oil base stock as a major component; and at least one friction modifier having an elemental composition comprising one or more of nitrogen (N), oxygen (O), and phosphorus (P), as a minor component; wherein said lubricating oil has a corrosion factor, based on the elemental composition of the at least one friction modifier, of less than 500, as determined by the formula:
   12900(N wt %)+3967(O wt %)−8524(P wt %)−250=corrosion factor
   
       and wherein corrosion resistance is improved and fuel efficiency is maintained or improved, in an engine or other mechanical component lubricated with the lubricating oil, as compared to corrosion resistance and fuel efficiency achieved using a lubricating oil containing a minor component other than the at least one friction modifier, or having a corrosion factor of greater than 500. 
     
     
         22 . The lubricating oil of  claim 21  which has a corrosion factor, based on the elemental composition of the at least one friction modifier, of less than 400. 
     
     
         23 . The lubricating oil of  claim 21  which has a corrosion factor, based on the elemental composition of the at least one friction modifier, of less than 200. 
     
     
         24 . The lubricating oil of  claim 21  which has a corrosion factor, based on the elemental composition of the at least one friction modifier, of less than 100. 
     
     
         25 . The lubricating oil of  claim 21  which has a corrosion factor, based on the elemental composition of the at least one friction modifier, of less than 50. 
     
     
         26 . The lubricating oil of  claim 21  wherein the lubricating oil base stock comprises a Group I, Group II, Group III, Group IV or Group V base oil. 
     
     
         27 . The lubricating oil of  claim 21  wherein the at least one friction modifier comprises an inorganic compound, an alkoxylated fatty acid ester, an alkanolamide, a polyol fatty acid ester, a borated glycerol fatty acid ester, a fatty alcohol ether, or mixtures thereof. 
     
     
         28 . The lubricating oil of  claim 27  wherein the inorganic compound comprises molybdenum amine, molybdenum diamine, an organotungstenate, a molybdenum dithiocarbamate, molybdenum dithiophosphates, molybdenum amine complexes, molybdenum carboxylates, or mixtures thereof. 
     
     
         29 . The lubricating oil of  claim 27  wherein the alkoxylated fatty acid ester comprises polyoxyethylene stearate, fatty acid polyglycol ester, polyoxypropylene stearate, polyoxybutylene stearate, polyoxyethylene isosterate, polyoxypropylene isostearate, polyoxyethylene palmitate, or mixtures thereof. 
     
     
         30 . The lubricating oil of  claim 27  wherein the alkanolamide comprises lauric acid diethylalkanolamide, palmic acid diethylalkanolamide, oleic acid diethyalkanolamide, stearic acid diethylalkanolamide, oleic acid diethylalkanolamide, polyethoxylated hydrocarbylamides, polypropoxylated hydrocarbylamides, or mixtures thereof. 
     
     
         31 . The lubricating oil of  claim 27  wherein the polyol fatty acid ester comprises glycerol mono-oleate, saturated mono-, di-, and tri-glyceride esters, glycerol mono-stearate, polyol esters, hydroxyl-containing polyol esters, or mixtures thereof. 
     
     
         32 . The lubricating oil of  claim 27  wherein the borated glycerol fatty acid ester comprises borated glycerol mono-oleate, borated saturated mono-, di- and tri-glyceride esters, borated glycerol mono-sterate, polyol monocarboxylate esters, polyol dicarboxylate esters, polyoltricarboxylate esters, glycerol mono-oleates, glycerol dioleates, glycerol trioleates, glycerol monostearates, glycerol distearates, glycerol tristearates, glycerol monopalmitates, glycerol dipalmitates, glycerol tripalmitates, isostearates, linoleates, ethoxylated, propoxylated, butoxylated fatty acid esters of polyols, or mixtures thereof. 
     
     
         33 . The lubricating oil of  claim 27  wherein fatty alcohol ether comprises stearyl ether, myristyl ether, ethoxylated, propoxylated, or butoxylated fatty alkyl ethers, stearyl, myristyl, C 11 -C 13  hydrocarbon, oleyl, isosteryl, alcohol ethers, or mixtures thereof. 
     
     
         34 . The lubricating oil of  claim 21  wherein the elemental composition of said at least one friction modifier is linked, associated or correlated to corrosion resistance of said lubricating oil as determined by lead (Pb) loss according to high temperature corrosion bench test (HTCBT) in conformity with ASTM D6594. 
     
     
         35 . The lubricating oil of  claim 21  wherein the elemental composition of said at least one friction modifier is linked, associated or correlated to corrosion resistance of said lubricating oil as determined by connecting rod bearing weight loss according to the modified Sequence VIII engine test in conformity with ASTM D6709. 
     
     
         36 . The lubricating oil of  claim 21  wherein the corrosion resistance of said lubricating oil as determined by lead (Pb) loss according to high temperature corrosion bench test (HTCBT) in conformity with ASTM D6594, is linked, associated or correlated to corrosion resistance of said lubricating oil as determined by connecting rod bearing weight loss according to the modified Sequence VIII engine test in conformity with ASTM D6709, based on the elemental composition of the at least one friction modifier and the corrosion factor. 
     
     
         37 . The lubricating oil of  claim 21  wherein the at least one friction modifier is present in an amount of from 0.01 weight percent to 5 weight percent, based on the total weight of the lubricating oil. 
     
     
         38 . The lubricating oil of  claim 21  wherein the lubricating oil base stock is present in an amount of from 50 weight percent to 95 weight percent, based on the total weight of the lubricating oil. 
     
     
         39 . The lubricating oil of  claim 21  wherein the lubricating oil further comprises one or more of an antiwear additive, viscosity modifier, antioxidant, detergent, dispersant, pour point depressant, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, and anti-rust additive. 
     
     
         40 . The lubricating oil of  claim 21  wherein the lubricating oil is a passenger vehicle engine oil (PVEO) or a commercial vehicle engine oil (CVEO).