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AssigneeThe Lubrizol Corporation
InventorsJoanne L. Jones, Mark C. Davies, Michael R. Sutton, Patrick E. Mosier
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The disclosed technology relates to lubricants for compression ignition internal combustion engines, particularly those demonstrating at least one of improved seals performance, reduced deposit formation, and excellent durability. The present invention provides a low zinc lubricating composition comprising (a) an oil of lubricating viscosity, (b) a borated dispersant, and (c) a metal-free organo-phosphorus anti-wear additive, wherein the lubricating composition is substantially free of a metal containing sulfur coupled alkyl phenol compound. Further, the low zinc lubricating composition contains zinc in an amount less than 600 ppm by weight of the composition.
A low zinc lubricating composition comprising:
The lubricating composition of claim 13, wherein the metal of the sulfonate detergent is selected from magnesium, calcium, sodium and mixtures thereof.
The lubricating composition of 22, wherein the derivative of a hydroxy-polycarboxylic acid is an imide derivative of tartaric acid.
The lubricating composition of 22, wherein the phosphorus free antiwear agent is present in an amount in the range of 0.1 wt % to 5 wt % of the lubricating composition.
A method of reducing deposit formation in a light-duty compression ignition internal combustion engine, comprising:
Dependencies are inferred from the claim text.