Lubricant formulations containing functionalized olefin polymers and reduced traditional dispersant

The lubricating oil composition of 25, wherein the base oil comprises at least 50 mass % of a group II base oil, based on the total mass of base oil present in the lubricating oil composition.

A method of reducing interaction of components in lubricating oil compositions/concentrates containing high molecular weight PIBSA-PAM dispersant,

• the method comprising including a functionalized polymer in addition to high molecular weight PIBSA-PAM, or partly replacing or fully replacing high molecular weight PIBSA-PAM in the lubricating oil composition by such a functionalized polymers, such that thereof the functionalized polymer to the high molecular weight PIBSA-PAM is at least 2:1, where the functionalized polymer comprises a partially or fully saturated olefin homopolymer or copolymer backbone, wherein the homopolymer or copolymer backbone comprises isoprene and at least one functional group, having:
• 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, and iii) where the homopolymer or copolymer backbone is derived from monomers selected from the group consisting of C2 to C30 linear, branched, and/or cyclic alpha olefins, and C4 to C20 conjugated dienes.

A method of reducing the treat rate of one or more of antioxidant, detergent, friction modifier, and viscosity modifier in a lubricating oil composition containing high molecular weight PIBSA-PAM dispersant, without compromising the performance of the lubricating oil composition in MHT-4 TEOST deposit formation test in accordance with ASTM D7097, the method comprising partly or fully replacing the high molecular weight PIBSA-PAM dispersant with a functionalized polymer where the functionalized polymer comprises a partially or fully saturated olefin homopolymer or copolymer backbone, wherein the homopolymer or copolymer backbone comprises isoprene and at least one functional group, having:

• 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, and iii) where the homopolymer or copolymer backbone is derived from monomers selected from the group consisting of C2 to C30 linear, branched, and/or cyclic alpha olefins, and C4 to C20 conjugated dienes;
• and
• the weight ratio of the functionalized polymer to the high molecular weight PIBSA-PAM is at least 2:1.

A method of reducing the treat rate of concentrate additive packages in lubricating oil compositions containing high molecular weight PIBSA-PAM dispersant by partly or fully replacing high molecular weight PIBSA-PAM dispersant with a functionalized polymer in the concentrate add-pack, where the functionalized polymer comprises a partially or fully saturated olefin homopolymer or copolymer backbone, wherein the homopolymer or copolymer backbone comprises isoprene and at least one functional group, having:

• 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, and iii) where the homopolymer or copolymer backbone is derived from monomers selected from the group consisting of C2 to C30 linear, branched, and/or cyclic alpha olefins, and C4 to C20 conjugated dienes;
• and the weight ratio of the functionalized polymer to the high molecular weight PIBSA-PAM is at least 2:1.

A method of increasing the anti-wear/friction reduction capability, as determined by the Average Friction/Traction coefficient determined using a High Frequency Reciprocating Rig, of a lubricating oil composition containing high molecular weight PIBSA-PAM dispersant, the method comprising including a functionalized polymer in addition to the high molecular weight PIBSA-PAM, or partly replacing or fully replacing the high molecular weight PIBSA-PAM in the lubricating oil composition by such a functionalized polymer, such that the weight ratio of the functionalized polymer to the high molecular weight PIBSA-PAM is at least 2:1, where the functionalized polymer comprises a partially or fully saturated olefin homopolymer or copolymer backbone, wherein the homopolymer or copolymer backbone comprises isoprene and at least one functional group, 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, and
• iii) where the homopolymer or copolymer backbone is derived from monomers selected from the group consisting of C2 to C30 linear, branched, and/or cyclic alpha olefins, and C4 to C20 conjugated dienes.