Carboxylated detergent-dispersant-containing compositions having improved properties in lubricating oils

A lubricant additive composition comprising:

• (a) a carboxylated detergent-dispersant obtained by:
• (i) neutralizing alkylphenols using an alkaline earth base in the presence of at least one carboxylic acid that contains from one to four carbon atoms but in the absence of alkali base, dialcohol, and monoalcohol, forming an intermediate product;
• and
• (ii) carboxylating the intermediate product using carbon dioxide so that at least 20 mole percent of the original alkylphenol starting material has been converted to alkaline earth metal single aromatic-ring hydrocarbyl salicylate;
• and,
• (b) at least one additive selected from the group consisting of:
• (i) an overbased sulfurized hydrocarbyl phenate of alkaline earth metals;
• (ii) an overbased hydrocarbyl phenate-carboxylate;
• (iii) a medium overbased salicylate having a total base number of about 50 to 170;
• (iv) a high overbased salicylate having a total base number greater than 170;
• and combinations and mixtures thereof.

A lubricating oil composition comprising:

• (a) an oil of lubricating viscosity;
• (b) a carboxylated detergent-dispersant obtained by:
• (i) neutralizing alkylphenols using an alkaline earth base in the presence of at least one carboxylic acid that contains from one to four carbon atoms but in the absence of alkali base, dialcohol, and monoalcohol, forming an intermediate product;
• and
• (iii) carboxylating the intermediate product using carbon dioxide so that at least 20 mole percent of the original alkylphenol starting material has been converted to alkaline earth metal single aromatic-ring hydrocarbyl salicylate;
• and,
• (c) at least one overbased, non-sulfonate-containing detergent.

A lubricating oil composition comprising:

• (a) an oil of lubricating viscosity;
• (b) a carboxylated detergent-dispersant obtained by:
• (i) neutralizing alkylphenols using an alkaline earth base in the presence of at least one carboxylic acid that contains from one to four carbon atoms but in the absence of alkali base, dialcohol, and monoalcohol, forming an intermediate product;
• and
• (ii) carboxylating the intermediate product using carbon dioxide so that at least 20 mole percent of the original alkylphenol starting material has been converted to alkaline earth metal single aromatic-ring hydrocarbyl salicylate;
• and,
• (c) at least one additive selected from the group consisting of:
• (i) an overbased sulfurized hydrocarbyl phenate of alkaline earth metals;
• (ii) an overbased hydrocarbyl phenate-carboxylate;
• (iii) a medium overbased salicylate having a total base number of about 50 to 170;
• (iv) a high overbased salicylate having a total base number greater than 170;
• and combinations and mixtures thereof.