Lubricating compositions for reduced low temperature valve train wear
AssigneeAfton Chemical Corporation
InventorsSamuel Bruce Field, Kenneth Garelick, Hidetaka Hoshino, Guillaume Carpentier
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Abstract
The present disclosure relates to lubricating compositions including effective amounts of molybdenum from an oil-soluble molybdenum compound and a magnesium boost in the detergent system to achieve passing motor friction and valve train wear performance.
Claims20
An engine lubricating oil composition providing improved low temperature valve train wear pursuant to the Sequence IVB engine test of ASTM D8350, the engine oil lubricating composition comprising:
- one or more base oils of lubricating viscosity;
- about 300 to about 1000 ppm molybdenum from an oil-soluble molybdenum compound;
- one or more metal-containing detergents providing greater than about 5 TBN to the lubricating oil composition, wherein the TBN is measured using ASTM D4739;
- wherein at least one of the one or more metal-containing detergents comprises an overbased magnesium detergent providing greater than about 2 TBN to the lubricating oil composition, wherein the TBN is measured using ASTM D4739;
- less than about 0.2 weight percent of a polymeric pour point depressant;
- wherein the engine oil composition has a viscosity grade according to SAE J 300 of 0W-8, 0W-12, 0W-16, or 0W-20;
- and
- wherein a weight ratio of magnesium-to-molybdenum is about 0.8:1 or less.
A method of lubricating a hybrid gasoline-electric engine to achieve improved low temperature valve train wear pursuant to the Sequence IVB engine test of ASTM D8350, the method comprising:
- lubricating a hybrid electric-gasoline engine with a lubricating oil composition having a viscosity grade according to SAE J 300 of 0W-8, 0W-12, 0W-16, or 0W-20;
- and
- the lubricating oil composition including one or more base oils of lubricating viscosity;
- about 300 to about 1000 ppm molybdenum from an oil-soluble molybdenum compound;
- one or more metal-containing detergent providing greater than about 5 TBN to the lubricating oil composition, wherein TBN is measured using ASTM D4739;
- wherein the at least one of the one or more metal-containing detergent comprises an overbased magnesium detergent providing greater than about 2 TBN to the lubricating oil composition, wherein the TBN is measured using ASTM D4739;
- and less than about 0.2 weight percent of a polymeric pour point depressant and wherein a weight ratio of magnesium-to-molybdenum in the lubricating oil composition is about 0.8:1 or less.
Dependencies are inferred from the claim text.