Lubricating oil compositions with engine wear protection

A method for improving wear control, while maintaining or improving fuel efficiency, in an engine or other mechanical component lubricated with a lubricating oil by using as the lubricating oil a formulated oil, said formulated oil having a composition comprising a lubricating oil base stock as a major component;

• and a mixture of (i) at least one metal salt of a carboxylic acid, and (ii) at least one metal salt of an organic acid, or at least one metal salt of an inorganic acid, or at least one metal salt of a phenol, or mixtures thereof, as minor components;
• wherein, for the at least one metal salt of a carboxylic acid, the metal is selected from the group consisting of palladium (Pd), silver (Ag), gold (Au), zinc (Zn), and mixtures thereof, and the carboxylic acid is selected from the group consisting of an aliphatic carboxylic acid, a cycloaliphatic carboxylic acid, an aromatic carboxylic acid, and mixtures thereof;
• wherein, for the at least one metal salt of an organic acid, the at least one metal salt of an inorganic acid, the at least one metal salt of a phenol, or mixtures thereof, the metal comprises an alkali metal, an alkaline earth metal, or mixtures thereof, and the organic or inorganic acid is selected from the group consisting of an aliphatic organic, a cycloaliphatic organic, an aromatic organic, and mixtures thereof;
• wherein said formulated oil is free of phosphorous;
• and wherein wear control is improved and fuel efficiency is maintained or improved as compared to wear control and fuel efficiency achieved using a lubricating oil containing minor components other than the mixture of (i) the at least one metal salt of a carboxylic acid, and (ii) the at least one metal salt of an organic acid, or the at least one metal salt of an inorganic acid, or the at least one metal salt of a phenol, or mixtures thereof.

A lubricating oil having a composition comprising a lubricating oil base stock as a major component;

• and at least one metal salt of a carboxylic acid, as a minor component;
• wherein the minor component contains no sulfur or phosphorus;
• wherein the metal is selected from the group consisting of palladium (Pd), silver (Ag), gold (Au), zinc (Zn), and mixtures thereof;
• wherein the carboxylic acid is selected from the group consisting of an aliphatic carboxylic acid, a cycloaliphatic carboxylic acid, an aromatic carboxylic acid, and mixtures thereof;
• wherein said formulated oil is free of phosphorous;
• and wherein wear control is improved and fuel efficiency is maintained or improved as compared to wear control and fuel efficiency achieved using a lubricating oil containing a minor component other than the at least one metal salt of a carboxylic acid.

A lubricating oil having a composition comprising a lubricating oil base stock as a major component;

• and a mixture of (i) at least one metal salt of a carboxylic acid, and (ii) at least one metal salt of an organic acid, or at least one metal salt of an inorganic acid, or at least one metal salt of a phenol, or mixtures thereof, as minor components;
• wherein, for the at least one metal salt of a carboxylic acid, the metal is selected from the group consisting of palladium (Pd), silver (Ag), gold (Au), zinc (Zn), and mixtures thereof, and the carboxylic acid is selected from the group consisting of an aliphatic carboxylic acid, a cycloaliphatic carboxylic acid, an aromatic carboxylic acid, and mixtures thereof wherein, for the at least one metal salt of an organic acid, the at least one metal salt of an inorganic acid, the at least one metal salt of a phenol, or mixtures thereof, the metal comprises an alkali metal, an alkaline earth metal, or mixtures thereof, and the organic acid or inorganic acid is selected from the group consisting of a sulfur-containing acid, a carboxylic acid, and mixtures thereof;
• wherein said formulated oil is free of phosphorous;
• and wherein wear control is improved and fuel efficiency is maintained or improved as compared to wear control and fuel efficiency achieved using a lubricating oil containing minor components other than the mixture of (i) the at least one metal salt of a carboxylic acid, and (ii) the at least one metal salt of an organic acid, or the at least one metal salt of an inorganic acid, or the at least one metal salt of a phenol, or mixtures thereof.