Method Of Lubricating An Internal Combustion Engine
First Claim
1. A method of lubricating a compression-ignition internal combustion engine with a maximum laden mass over 2,700 kg comprising supplying to the engine a lubricating composition comprising:
- an oil of lubricating viscosity,a 300 TBN or higher alkaline earth metal sulfonate detergent having a metal ratio of 10 to 40,an alkaline earth metal sulfonate detergent having a metal ratio of 3 to 9, and a TBN of 81 to 180 mg KOH/g (as measured by ASTM D2896-11),wherein the sulfonate detergents provide a total amount of sulfonate substrate of 0.8 wt % to 3 wt %, or 0.9 wt % to 3 wt %, or 1 wt % to 3 wt % of the lubricating composition,0.1 to 1.2 wt % of antioxidant, wherein at least 20 wt % of the antioxidant is a phenolic antioxidant,a borated compound present in an amount to deliver 25 ppm to 300 ppm of boron and the borated compound is chosen froma borate-ester,a borated dispersant, andwhereinthe lubricating composition has a sulfated ash content of 0.4 wt % to 2 wt %, or 0.5 wt % to 1.8 wt %, or 0.5 wt % to not more than 1.5 wt %, andthe lubricating composition has a TBN of 6.5 to 15 mg KOH/g (as measured by ASTM D2896-11).
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Accused Products
Abstract
The disclosed technology provides a method of lubricating a compression-ignition internal combustion engine with a maximum laden mass over 2,700 kg comprising supplying to the engine a lubricating composition comprising: an oil of lubricating viscosity, a 300 TBN or higher alkaline earth metal sulfonate detergent having a metal ratio of 10 to 40, an alkaline earth metal sulfonate detergent having a metal ratio of 3 to 9, and a TBN of 81 to 180 mg KOH/g, wherein the sulfonate detergents provide a total amount of sulfonate substrate of 1 wt % to 3 wt % of the lubricating composition, 0.1 to 1.2 wt % of antioxidant, wherein at least 20 wt % of the antioxidant is a phenolic antioxidant, a borated compound present in an amount to deliver 25 ppm to 300 ppm of boron, the lubricating composition has a sulfated ash content of 0.5 wt % to not more than 1.5 wt %, and the lubricating composition has a TBN of 6.5 to 15 mg KOH/g.
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Citations
71 Claims
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1. A method of lubricating a compression-ignition internal combustion engine with a maximum laden mass over 2,700 kg comprising supplying to the engine a lubricating composition comprising:
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an oil of lubricating viscosity, a 300 TBN or higher alkaline earth metal sulfonate detergent having a metal ratio of 10 to 40, an alkaline earth metal sulfonate detergent having a metal ratio of 3 to 9, and a TBN of 81 to 180 mg KOH/g (as measured by ASTM D2896-11), wherein the sulfonate detergents provide a total amount of sulfonate substrate of 0.8 wt % to 3 wt %, or 0.9 wt % to 3 wt %, or 1 wt % to 3 wt % of the lubricating composition, 0.1 to 1.2 wt % of antioxidant, wherein at least 20 wt % of the antioxidant is a phenolic antioxidant, a borated compound present in an amount to deliver 25 ppm to 300 ppm of boron and the borated compound is chosen from a borate-ester, a borated dispersant, and wherein the lubricating composition has a sulfated ash content of 0.4 wt % to 2 wt %, or 0.5 wt % to 1.8 wt %, or 0.5 wt % to not more than 1.5 wt %, and the lubricating composition has a TBN of 6.5 to 15 mg KOH/g (as measured by ASTM D2896-11). - View Dependent Claims (4, 6, 7, 14, 15, 16, 17, 18, 19, 21, 29, 30, 35, 36, 41, 44, 46, 54, 62, 63, 65, 66, 69, 70, 71)
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62. The method of claim 1, wherein the borate ester is represented by one or more of the formulae:
(RO)3B, or (RO)2B—
O—
B(OR)2, or
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63. The method of claim 1, wherein the borate ester comprises a trialkylborate.
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65. The method of claim 1, wherein the lubricating composition further comprises a zinc dialkyldithiophosphate.
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66. The method of claim 65, wherein the zinc dialkyldithiophosphate is a primary zinc dialkyldithiophosphate, or a secondary zinc dialkyldithiophosphate
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69. The method of claim 65, wherein the zinc dialkyldithiophosphate is present to deliver 100 ppm to 1000 ppm, or 200 ppm to 900 ppm, or 350 ppm to 900 ppm of phosphorus.
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70. The method of claim 1, wherein the internal combustion engine has a steel surface on a cylinder bore, cylinder block, or piston ring.
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71. The method of claim 1, wherein the internal combustion engine has a surface of steel, or an aluminium alloy, or an aluminium composite.
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5. (canceled)
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8-13. -13. (canceled)
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20. (canceled)
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22-28. -28. (canceled)
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31-34. -34. (canceled)
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37-40. -40. (canceled)
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42-43. -43. (canceled)
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45. (canceled)
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47-53. -53. (canceled)
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55-61. -61. (canceled)
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64. (canceled)
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67-68. -68. (canceled)
Specification