Formulated lubricants meeting 0W and 5W low temperature performance specifications made from a mixture of base stocks obtained by different final wax processing routes
First Claim
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1. A multi-grade engine oil meeting SAE engine oil viscosity classification for 0W-X or 5W-X low temperature specification and NOACK volatility of 15% or less, a 0W-X specification of CCS viscosity at −
- 35°
C. of 6200 cP or less and of MRV at −
40°
C. of 60,000 cP or less, or a 5W-X specification of CCS viscosity at −
30°
C. of 6600 cP or less and of MRV at −
35°
C. of 60,000 cP or less, and a yield stress of less than 35 pascals comprising a mixture of at least two base stocks, or of base stock(s) and base oil(s) or of two base oils each base stock or base oil being produced employing different final wax removal or conversion processing routes wherein each base stock or base oil individually has a kinematic viscosity at 100°
C. in the range of about 3.5 to 7 mm2/s and the mixture thereof without additives has a kinematic viscosity at 100°
C. in the range of about 4 to 6 mm2/s and wherein the pour point of each stock and/or base oil is mixture is about −
30°
C. or higher provided that as compared to the temperature at which the MRV is measured for each engine oil grade the difference between the pour point of the oil mixture and the temperature of measurement of the MRV of the formulated oil is at least about 10°
C., and about zero to 0.1 wt % of a pour point depressant (as received) based on the total weight of the engine oil.
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Abstract
Formulated lubricating oils meeting 0W and 5W low temperature CCS and MRV performance specification and exhibiting a Noack volatility of about 15 wt % or less are prepared from a mixture of base stocks/base oils of similar kinematic viscosity grade range produced by different final wax processing routes and omitting or reducing the amount of viscosity modifiers and pour point depressants.
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Citations
21 Claims
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1. A multi-grade engine oil meeting SAE engine oil viscosity classification for 0W-X or 5W-X low temperature specification and NOACK volatility of 15% or less, a 0W-X specification of CCS viscosity at −
- 35°
C. of 6200 cP or less and of MRV at −
40°
C. of 60,000 cP or less, or a 5W-X specification of CCS viscosity at −
30°
C. of 6600 cP or less and of MRV at −
35°
C. of 60,000 cP or less, and a yield stress of less than 35 pascals comprising a mixture of at least two base stocks, or of base stock(s) and base oil(s) or of two base oils each base stock or base oil being produced employing different final wax removal or conversion processing routes wherein each base stock or base oil individually has a kinematic viscosity at 100°
C. in the range of about 3.5 to 7 mm2/s and the mixture thereof without additives has a kinematic viscosity at 100°
C. in the range of about 4 to 6 mm2/s and wherein the pour point of each stock and/or base oil is mixture is about −
30°
C. or higher provided that as compared to the temperature at which the MRV is measured for each engine oil grade the difference between the pour point of the oil mixture and the temperature of measurement of the MRV of the formulated oil is at least about 10°
C., and about zero to 0.1 wt % of a pour point depressant (as received) based on the total weight of the engine oil. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11)
- 35°
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6. The multi-grade engine oil of 5 wherein the amount of catalytically dewaxed stock combined with the solvent dewaxed stock ranges from about 10 to 25 wt %.
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12. A method for producing a base oil for use as the base oil in the formulation of 0W-X or 5W-X multi-grade engine oils meeting a NOACK volatility of 15% or less, a 0W-X specification of CCS viscosity at −
- 35°
C. of 6200 cP or less and of MRV at 40°
C. of 60,000 cP or less, or a 5W-X specification of CCS viscosity at −
30°
C. of 6600 cP or less and of MRV at −
35°
C. of 60,000 cP or less, and a yield stress of less than 35 pascals when formulated, said method comprising mixing at least two base stocks, or base stock and base oil, or two base oils produced by different final wax removal or conversion processing routes, wherein each base stock or base oil individually making up the mixture has a kinematic viscosity at 100°
C. in the range of about 3.5 to 7.0 mm2/s, the mixture itself, without additives, having a kinematic viscosity at 100°
C. in the range of about 4 to 6 mm2/s and wherein the pour point of each base stock or base oil in the mixture, without additive, is about −
30°
C. or higher, provided that as compared to the temperature at which the MRV is measured for each engine oil grade the difference between the pour point of the oil mixture and the temperature of measurement of the MRV of the formulated oil is at least about 10°
C. - View Dependent Claims (13, 14, 15, 17, 18, 19, 20, 21)
- 35°
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16. The multi-grade engine oil of 15 wherein the amount of catalytically dewaxed stock combined with the solvent dewaxed stock ranges from about 10 to 25 wt %.
Specification