Lubricating oil compositions and methods for lubricating gasoline-fueled and/or alcohol-fueled, spark-ignited engines

A lubrication oil composition for gasoline fueled or alcohol fueled spark-ignited engines, or both, having a sulfate ash content of less than about 1.3% and which comprises:

• (A) a major amount of oil of lubrication viscosity;
• (B) at least one detergent selected from the group consisting of a basic magnesium salt of an organic acid, and a mixture of at least one basic magnesium salt of an organic acid and another alkaline earth metal salt of an organic acid wherein more than 50% of the metal in the mixture is magnesium;
• and
• (C) at least one metal salt of a substituted succinic acid acylated polyamine obtained by reacting
• (C-1-a) about 2 equivalents of at least one substituted succinic acylating agent consisting of hydrocarbon substituent groups and succinic groups wherein the substituent group has a number average molecular weight of at least about 700 with
• (C-1-b) about 1 equivalent of a basic metal reactant;
• and
• (C-1-c) from about 1 to about 5 equivalents of an amine compound having at least one HN<
• group;
• and
• (D) at least one carboxylic derivative composition produced by reacting
• (D-1) at least one substituted succinic acylating agent with
• (D-2) a reactant selected from the group consisting of at least one amine compound having at least one HN<
• group;
• at least one alcohol;
• or mixtures of said amines and alcohols.

The method of operating alcohol-fueled, spark-ignited engines which comprises lubricating said engines during operation with an oil composition comprising

• (A) an oil of lubricating viscosity;
• (B) at least one detergent selected from the group consisting of a basic magnesium salt of an organic acid, and a mixture of at least one basic magnesium salt of an organic acid and another alkaline earth metal salt of an organic acid wherein more than 50% of the metal in the mixture is magnesium;
• and
• (D) at least one carboxylic derivative composition produced by reacting
• (D-1) at least one substituted succinic acylating agent with
• (D-2) a reactant selected from the group consisting of at least one amine compound having at least one HN<
• group;
• at least one alcohol;
• or mixtures of said amines and alcohols.

A method of operating gasoline or alcohol-fueled, spark-ignited engines, or both, which comprises lubricating said engines during operation with an oil composition which comprises:

• (A) an oil of lubricating viscosity;
• (B) at least one detergent selected from the group consisting of a basic magnesium salt of an organic acid, and a mixture of at least one basic magnesium salt of an organic acid and another alkaline earth metal salt of an organic acid wherein more than 50% of the metal in the mixture is magnesium;
• and
• (C) at least one metal salt of
• (C-1) a substituted succinic acid acylated polyamine;
• or
• (C-2) a hydrocarbon-substituted aromatic carboxylic acid containing at least one hydroxyl group attached to an aromatic ring, provided that the metal of said metal salt (C) is not calcium or magnesium.

A method of operating gasoline or alcohol-fueled, spark-ignited engines, or both, which comprises lubricating said engines during operation with an oil composition having a sulfate ash content of less than about 1.3% and which comprises:

• (A) a major amount of oil of lubrication viscosity;
• (B) at least one detergent selected from the group consisting of a basic magnesium salt of an organic acid, and a mixture of at least one basic magnesium salt of an organic acid and another alkaline earth metal salt of an organic acid wherein more than 50% of the metal in the mixture is magnesium;
• and
• (C) at least one metal salt of a substituted succinic acid acylated polyamine obtained by reacting
• (C-1-a) about 2 equivalents of at least one substituted succinic acylating agent consisting of hydrocarbon substituent groups and succinic groups wherein the substituent group has a number average molecular weight of at least about 700 with
• (C-1-b) about 1 equivalent of a basic metal reactant;
• and
• (C-1-c) from about 1 to about 5 equivalents of an amine compound having at least one HN<
• group;
• and
• (D) at least one carboxylic derivative composition produced by reacting
• (D-1) at least one substituted succinic acylating agent with
• (D-2) a reactant selected from the group consisting of at least one amine compound having at least one HN<
• group;
• at least one alcohol;
• or mixtures of said amines and alcohols.

A method of preventing or reducing corrosion and pre-ignition of alcohol-fueled, spark-ignited engines comprises lubricating said engines during operation with an oil composition which comprises:

• (A) an oil of lubricating viscosity;
• (B) at least one detergent selected from the group consisting of a basic magnesium salt of an organic acid, and a mixture of at least one basic magnesium salt of an organic acid and another alkaline earth metal salt of an organic acid wherein more than 50% of the metal in the mixture is magnesium;
• and
• (C) at least one metal salt of
• (C-1) a substituted succinic acid acylated polyamine;
• or
• (C-2) a hydrocarbon-substituted aromatic carboxylic acid containing at least one hydroxyl group attached to an aromatic ring, provided that the metal of said metal salt (C) is not calcium or magnesium.

A method of preventing or reducing corrosion and pre-ignition of alcohol-fueled, spark-ignited engines which comprises lubricating said engines during operation with an oil composition having a sulfate ash content of less than about 1.3% and which comprises:

• (A) a major amount of oil of lubrication viscosity;
• (B) at least one detergent selected from the group consisting of a basic magnesium salt of an organic acid, and a mixture of at least one basic magnesium salt of an organic acid and another alkaline earth metal salt of an organic acid wherein more than 50% of the metal in the mixture is magnesium;
• and
• (C) at least one metal salt of a substituted succinic acid acylated polyamine obtained by reacting
• (C-1-a) about 2 equivalents of at least one substituted succinic acylating agent consisting of hydrocarbon substituent groups and succinic groups wherein the substituent group has a number average molecular weight of at least about 700 with
• (C-1-b) about 1 equivalent of a basic metal reactant;
• and
• (C-1-c) from about 1 to about 5 equivalents of an amine compound having at least one HN<
• group;
• and
• (D) at least one carboxylic derivative composition produced by reacting
• (D-1) at least one substituted succinic acylating agent with
• (D-2) a reactant selected from the group consisting of at least one amine compound having at least one HN<
• group;
• at least one alcohol;
• or mixtures of said amines and alcohols.