Lubricant compositions providing robust valvetrain wear protection in the ford 6.7L engine test

A lubricating oil composition containing less than 1000 ppm phosphorus,

• comprising:
• A) at least 50 mass % of one or more base oil(s), based on the total mass of the lubricating oil composition;
• B) one or more dispersant(s),
• wherein said one or more dispersant(s) comprise 2 to 10 mass %, based on the total mass of the lubricating oil composition, of one or more poly(alkenyl)succinimides, in which the polyalkenyl is derived from polyisobutylene and the imide is derived from polyamine (“PIBSA-PAM”);
• wherein the one or more PIBSA-PAM(s) comprise at least 2.0 mass %, based on the total mass of the lubricating oil composition, of one or more unborated PIBSA-PAM(s);
• C) one or more detergent(s),
• wherein said one or more detergent(s) together provide soap to the lubricating oil composition in an amount of 0.1 to 0.9 mass %, based on the total mass of the lubricating oil composition;
• and
• wherein said one or more detergent(s) comprise 50 mass % or less, based on the total mass of detergent(s) present in the lubricating oil composition, of calcium salicylate;
• and
• D) a functionalized polymer at from 0.1 to 10 mass % based upon the total mass of the lubricating oil composition, wherein the functionalized polymer comprises an amide or imide functionalized partially or fully saturated homo-polyisoprene, having:
• i) an Mn of 10,000 g/mol or more (GPC-PS) of the polymer prior to functionalization,
• ii) where the functional group is derived from an acylating agent and a compound containing amino and/or hydroxyl groups (including but not limited to where the polymer is functionalized with an acylating agent and subsequently reacted with a compound containing amino and/or hydroxyl groups), and,
• iii) an Mw/Mn of less than 2,
• iv) a Functionality Distribution (Fd) value of 3.5 or less, and
• v) an average functionality (Fv) of 5 to 20 functional group grafts/polymer chain;
• wherein:
• i) the ratio of mass %, based on the total mass of the lubricating oil composition, of the one or more unborated PIBSA-PAM(s) to soap of the lubricating oil composition is 6.65 or more, and ii) the lubricating oil composition has an SAE viscosity grade of 20W-X, 15W-X, 10W-X, or 5W-X, where X represents any one of 8, 12, 16, 20, 30, and 40, such as 30 or 40, such as 30, wherein the mass ratio of the one or more unborated PIBSA-PAM to the soap of the one or more detergents is greater than or equal to 8.30.

A lubricating oil composition containing less than 1000 ppm phosphorus,

• comprising:
• A) at least 50 mass % of one or more base oil(s), based on the total mass of the lubricating oil composition;
• B) one or more dispersant(s),
• wherein said one or more dispersant(s) comprise 2 to 10 mass %, based on the total mass of the lubricating oil composition, of one or more poly(alkenyl)succinimides, in which the polyalkenyl is derived from polyisobutylene and the imide is derived from polyamine (“PIBSA-PAM”);
• wherein the one or more PIBSA-PAM(s) comprise at least 2.0 mass %, based on the total mass of the lubricating oil composition, of one or more unborated PIBSA-PAM(s);
• and
• C) one or more detergent(s),
• wherein said one or more detergent(s) together provide soap to the lubricating oil composition in an amount of 0.1 to 0.9 mass %, based on the total mass of the lubricating oil composition;
• and
• D) an amide, imide, and/or ester functionalized polymer comprising a partially or fully saturated homo-polyisoprene having:
• i) an Mw/Mn of less than 2,
• ii) a Functionality Distribution (Fd) value of 3.5 or less, and
• iii) an Mn of 10,000 g/mol or more (GPC-PS) of the polymer prior to functionalization;
• and
• iv) an average functionality (Fv) of 5 to 20 functional group grafts/polymer chain;
• wherein:
• i) the ratio of mass %, based on the total mass of the lubricating oil composition, of the one or more unborated PIBSA-PAM(s) to soap of the lubricating oil composition is 6.65 or more, and ii) the lubricating oil composition has an SAE viscosity grade of 20W-X, 15W-X, 10W-X, or 5W-X, where X represents any one of 8, 12, 16, 20, 30, and 40, such as 30 or 40, such as 30, wherein the mass ratio of the one or more unborated PIBSA-PAM to the soap of the one or more detergents is greater than or equal to 8.30.

A method of increasing the anti-wear capability of a lubricating oil composition containing less than 1000 ppm phosphorus,

• the method comprising including in the lubricating oil composition:
• i) at least 50 mass % of one or more base oils, based on the total mass of the lubricating oil composition;
• ii) one or more dispersants,
• wherein said one or more dispersants comprise 2.0 to 6.00 mass %, based on the total mass of the lubricating oil composition, of one or more poly(alkenyl)succinimides, in which the polyalkenyl is derived from polyisobutylene and the imide is derived from polyamine (“PIBSA-PAM”);
• wherein the one or more PIBSA-PAM(s) comprise at least 2.0 mass % of one or more unborated PIBSA-PAM(s);
• iii) one or more detergents,
• wherein said one or more detergents together provide soap to the lubricating oil composition in an amount of 0.1 to 0.9 mass %, based on the total mass of the lubricating oil composition;
• and
• iv) an amide, imide, and/or ester functionalized polymer comprising a partially or fully saturated homo-polyisoprene having:
• i) an Mw/Mn of less than 2,
• ii) a Functionality Distribution (Fd) value of 3.5 or less, and
• iii) an Mn of 10,000 g/mol or more (GPC-PS) of the polymer prior to functionalization;
• and
• iv) an average functionality (Fv) of 5 to 20 functional group grafts/polymer chain;
• wherein:
• a) the ratio of mass %, based on the total mass of the lubricating oil composition, of the one or more unborated PIBSA-PAM(s) to soap of the lubricating oil composition is 6.65 or more, and b) the lubricating oil composition has an SAE viscosity grade of 20W-X, 15W-X, 10W-X, or 5W-X, where X represents any one of 8, 12, 16, 20, 30, and 40, such as 30 or 40, such as 30, wherein the mass ratio of the one or more unborated PIBSA-PAM to the soap of the one or more detergents is greater than or equal to 8.30.

A method of increasing the anti-wear capability of a lubricating oil composition containing less than 1000 ppm phosphorus,

• the method comprising including in the lubricating oil composition:
• i) at least 50 mass % of one or more base oils, based on the total mass of the lubricating oil composition;
• ii) one or more dispersants,
• wherein said one or more dispersants comprise 2 to 10 mass %, based on the total mass of the lubricating oil composition, of one or more poly(alkenyl)succinimides, in which the polyalkenyl is derived from polyisobutylene and the imide is derived from polyamine (“PIBSA-PAM”);
• wherein the one or more PIBSA-PAM(s) comprise at least 2.0 mass %, based on the total mass of the lubricating oil composition, of one or more unborated PIBSA-PAM(s);
• iii) one or more detergents,
• wherein said one or more detergents together provide soap to the lubricating oil composition in an amount of 0.1 to 0.9 mass %, based on the total mass of the lubricating oil composition;
• wherein said one or more detergent(s) comprise 50 mass % or less, based on the total mass of detergent(s) present in the lubricating oil composition, of calcium salicylate;
• and
• iv) an amide, imide, and/or ester functionalized polymer comprising a partially or fully saturated homo-polyisoprene having:
• i) an Mw/Mn of less than 2,
• ii) a Functionality Distribution (Fd) value of 3.5 or less, and
• iii) an Mn of 10,000 g/mol or more (GPC-PS) of the polymer prior to functionalization;
• and
• iv) an average functionality (Fv) of 5 to 20 functional group grafts/polymer chain;
• wherein:
• i) the ratio of mass %, based on the total mass of the lubricating oil composition, of the one or more unborated PIBSA-PAM(s) to soap of the lubricating oil composition is 6.65 or more, ii) the lubricating oil composition has an SAE viscosity grade of 20W-X, 15W-X, 10W-X, or 5W-X, where X represents any one of 8, 12, 16, 20, 30, and 40, such as 30 or 40, and iii) optionally wherein the anti-wear capability of the lubricating oil composition is increased such that the valve train rocker arm wear is less than 120 mg, as determined by the Ford 6.7 L Power Stroke Diesel Engine Test for soot induced wear and viscosity control, wherein the mass ratio of the one or more unborated PIBSA-PAM to the soap of the one or more detergents is greater than or equal to 8.30.