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US 2024/0360376 A1Published application
Detergent systems for improved piston cleanliness
AssigneeAfton Chemical Corporation
InventorsPaul Ransom, Jason Bell, Samuel Bruce Field, Guillaume Carpentier
Life of this patent
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Abstract
The present disclosure relates to lubricating compositions achieving piston cleanliness pursuant to CEC L-117-20 (VW TDi3) that fail to achieve desired piston cleanliness pursuant to CEC L-078-99 (VW TDi2).
Claims28
A lubricating composition comprising:
- one or more base oils of lubricating viscosity;
- less than 2 weight percent of total antioxidant compounds selected from aminic antioxidant compounds, phenolic antioxidant compounds, molybdenum antioxidant compounds, or combinations thereof;
- less than 100 ppm of boron;
- a detergent system having a total base number (TBN) of at least 5.5 mg KOH/g as measured by ASTM D2896 and having a soap content of about 75 percent or more of sulfonate soap and about 25 percent or less of phenate soap, salicylate soap, calixarate soap, or combinations thereof;
- wherein the lubricating composition includes less than 20 weight percent of API Group IV base oils;
- and
- wherein the lubricating composition exhibits an average piston cleanliness of 53 merits or higher in the CEC L-117-20 (VW TDi3) piston cleanliness test of RL276-5.
4 more elements
A method of passing the CEC L-117-20 piston cleanliness test, the method comprising:
- providing a lubricating composition including one or more base oils of lubricating viscosity;
- less than 2 weight percent of total antioxidant compounds selected from aminic antioxidant compounds, phenolic antioxidant compounds, molybdenum antioxidant compounds, or combinations thereof;
- less than 100 ppm of boron;
- a detergent system having a total base number (TBN) of at least 5.5 mg KOH/g as measured by ASTM D2896 and having a soap content of about 75 percent or more of sulfonate soap and about 25 percent or less of phenate soap, salicylate soap, calixarate soap, or combinations thereof;
- and less than 20 weight percent of API Group IV base oils;
- and
- measuring piston cleanliness pursuant to CEC L-117-20 (VW TDi3) and wherein the lubricating composition has an average piston cleanliness of 53 merits or higher in the CEC L-117-20 test of RL276-5.
4 more elements
Dependencies are inferred from the claim text.