Lubricating composition for enhanced fuel economy
AssigneeAfton Chemical Corporation
InventorsSamuel Bruce Field, Paul Ransom
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to passenger car engine lubricating oil compositions and methods of lubricating a crankcase of a passenger car engine with such lubricating oil compositions effective to achieve fuel economy improvement when using select calcium sulfonate-based compounds combined with one or more oil-soluble molybdenum compounds in ultra-low viscosity engine oils.
Claims19
A method of improving the fuel economy of a passenger car engine using a lubricating oil composition, the method comprising:
- lubricating an engine crankcase of a passenger car engine with a lubricating oil composition and achieving a positive fuel economy increase when fuel economy is measured pursuant to one or both of JASO M 366 and/or JASO M 365;
- wherein the lubricating oil composition includes (i) at least one calcium-containing hydrocarbyl-substituted sulfonate compound providing about 900 ppm or more calcium to the lubricating oil composition, wherein the hydrocarbyl moiety thereof has a number average molecular weight of about 80 to about 300 g/mol, (ii) at least one oil soluble molybdenum compound providing about 500 to about 1200 ppm molybdenum to the lubricating oil composition;
- (iii) a total measured sulfated ash about 0.8 weight percent or less as measured pursuant to ASTM D874;
- (iv) a total base number (TBN) of the lubricating oil composition, measured pursuant to ASTM D2896, of at least about 6.0 mg KOH/gram;
- and (v) a high temperature high shear viscosity as measured pursuant to ASTM D4683 at 150° C. of about 1.7 to about 2.9 cSt;
- and
- wherein the lubricating oil composition is essentially devoid of sulfur-free detergents, the lubricating oil composition is substantially free of magnesium-containing detergents, and the lubricating oil composition contains less than 50 ppm of magnesium.
A passenger car engine lubricating oil composition configured to achieve positive fuel economy improvement pursuant to JASO M 366 and/or JASO M 365, the composition comprising:
- at least one calcium-containing hydrocarbyl-substituted sulfonate compound providing about 900 ppm or more calcium to the lubricating oil composition, wherein the hydrocarbyl moiety thereof having a number average molecular weight of about 80 to 300 g/mol;
- at least one oil soluble molybdenum compound providing about 500 to about 1200 ppm molybdenum to the lubricating oil composition;
- a total measured sulfated ash about 0.8 weight percent or less as measured pursuant to ASTM D874;
- a total base number (TBN) of the lubricating oil composition, measured pursuant to ASTM D2896, of at least about 6.0 mg KOH/gram;
- a high temperature high shear viscosity as measured pursuant to ASTM D4683 at 150° C. of about 1.7 to about 2.9 cSt;
- and
- wherein the lubricating oil composition has a weight ratio of calcium-to-molybdenum of about 1:1 to about 2:1, the lubricating oil composition is essentially devoid of sulfur-free detergents, the lubricating oil composition is substantially free of magnesium-containing detergents, and the lubricating oil composition contains less than 50 ppm of magnesium.
Dependencies are inferred from the claim text.