Back to results
US 2024/0209277 A1Published application
Detergent- free and low- ash lubricating composition
AssigneeAfton Chemical Corporation
InventorsMariah Parker, Jason Bell, Kenneth Garelick
Life of this patent
Estimating the term…
Abstract
This disclosure describes detergent-free and low-ash lubricating composition achieving piston cleanliness with one or more succinimide dispersants, one or more ashless antiwear additives, and one or more antioxidants when selected ratios of sulfur, phosphorus, and nitrogen are maintained.
Claims29
A detergent-free and low-ash lubricating composition comprising:
- one or more base oils of lubricating viscosity;
- a total sulfated ash (SASH) as measured by ASTM D874 of less than about 0.2 weight percent;
- one or more succinimide dispersants derived from a polyisobutylene having a number average molecular weight of at least about 1000, wherein the succinimide dispersants each have up to about 2 weight percent of nitrogen and wherein at least one of the succinimide dispersants is post treated with a boron compound;
- one or more ashless antiwear additives;
- one or more antioxidants;
- a total base number (TBN) pursuant to ASTM D2896 of at least about 4;
- at least about 1000 ppm of nitrogen, no more than 100 ppm of boron, no more than 800 ppm of sulfur, and a sulfur-to-phosphorus ratio of 2.0 or less, and a ratio of nitrogen-to-TBN of about 150 or greater;
- and
- wherein the detergent-free, low ash lubricating composition is substantially free of calcium, barium, copper, lead, lithium, magnesium, sodium, molybdenum, zinc, and potassium.
6 more elements
A method of lubricating a combustion engine using a detergent-free and low-ash ash lubricating composition, the method comprising:
- lubricating a combustion engine with a detergent-free and low-ash lubricating composition;
- wherein the detergent-free, low ash lubricating composition includes one or more base oils of lubricating viscosity;
- a total sulfated ash (SASH) as measured by ASTM D874 of less than about 0.2 weight percent;
- one or more succinimide dispersants derived from a polyisobutylene having a number average molecular weight of at least about 1000, wherein the succinimide dispersants each have up to about 2 weight percent of nitrogen and wherein at least one of the succinimide dispersants is post treated with a boron compound;
- one or more ashless antiwear additives;
- one or more antioxidants;
- a total base number (TBN) pursuant to ASTM D2896 of at least about 4;
- at least about 1000 ppm of nitrogen, no more than 100 ppm of boron, no more than 800 ppm of sulfur, and a sulfur-to-phosphorus ratio of 2.0 or less, and a ratio of nitrogen-to-TBN of about 150 or greater;
- and wherein the detergent-free, low ash lubricating composition is substantially free of calcium, barium, copper, lead, lithium, magnesium, sodium, molybdenum, zinc, and potassium;
- and
- wherein the lubricating composition cleans up piston deposits pursuant to the Sequence IIIH Engine Test (ASTM D8111) with a merit rating of at least about 4 total weighted piston deposits, and wherein the lubricating composition exhibits an average engine varnish (AES) of at least 8 merits and/or an average engine sludge rating of at least 7.6 merits pursuant to the Sequence VH test (ASTM D8256).
8 more elements
Dependencies are inferred from the claim text.