# US 11,898,119 B2 · Lubricating oil compositions with resistance to engine deposit and varnish formation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,119 B2 - Document ID: US11898119B2 - Status: Granted - Kind: B2 - Application number: 17/584,089 - Filed: 2022-01-25 - Published: 2023-07-27 - Granted: 2024-02-13 - Earliest claimed: 2022-01-25 - Assignees: Afton Chemical Corporation - Applicants: Afton Chemical Corporation - Inventors: Todd Dvorak; Kenneth Garelick; Mark Devlin - Web page: https://patentgrep.com/patent/US11898119B2 ## CPC - C10M 169/044: {the additives being a mixture of non-macromolecular and macromolecular compounds} - C10M 137/10: Thio derivatives - C10M 143/04: containing propene - C10M 161/00: Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential - C10M 2203/003: used as base material - C10M 2203/1025: used as base material - C10M 2205/022: Ethene - C10M 2205/024: Propene - C10M 2215/28: Amides; Imides - C10M 2223/045: Metal containing thio derivatives - C10N 2010/12: Groups 6 or 16 - C10N 2020/019: {Shear stability} - C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure - C10N 2030/42: {Phosphor free or low phosphor content compositions} - C10N 2030/68: {Shear stability} - C10N 2040/25: Internal-combustion engines - C10N 2040/255: {Gasoline engines} - C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33) - C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS ## Abstract A lubricating oil composition comprising greater than 50 wt. % of a base oil of lubricating viscosity, and an additive composition comprising: an amount of one or more zinc dialkyl dithiophosphates (ZDDP compounds) and an amount of one or more viscosity modifiers, wherein an amount of phosphorus (P) in weight percent provided to the lubricating oil composition by the one or more ZDDP compounds divided by the amount of the one or more viscosity modifiers (VM) in weight percent based on a total weight of the lubricating oil composition is a P/VM quotient of more than about 0.0075. The lubricating oil composition can improve resistance to engine deposits and extend oil drain intervals of an internal combustion engine. ## Claims ### Claim 1 An engine oil composition comprising greater than 50 wt. % of a base oil of lubricating viscosity, and an additive composition comprising: an amount of one or more zinc dialkyl dithiophosphates (ZDDP compounds) and an amount of one or more viscosity modifiers, wherein an amount of phosphorus (P) in weight percent provided to the engine oil composition by the one or more ZDDP compounds divided by the amount of the one or more viscosity modifiers (VM) in weight percent based on a total weight of the engine oil composition is a P/VM quotient of more than about 0.0115, the viscosity modifier is a linear polyolefin consisting of ethylene and propylene and having a shear stability index (SSI) of from about 3% to less than 30%, as measured using test method ASTM-D6278, and the engine oil composition provides a result in an Average Engine Varnish test (ASTM D8256) of 9.40 or higher, and wherein the one or more ZDDP compounds comprise a ZDDP compound derived from 100% secondary alcohols which are a mixture of methyl isobutyl carbinol and isopropyl alcohol and the amount of phosphorus from the one or more ZDDP compounds is about 787 ppmw to 1200 ppmw. ### Claim 2 (depends on 1) The engine oil composition of claim 1, wherein the amount of VM is less than 14 wt. %. ### Claim 3 (depends on 1) The engine oil composition of claim 1, wherein the linear polyolefin has a polydispersity (Mw/Mn) ranging from about 1.5 to about 10. ### Claim 4 (depends on 1) The engine oil composition of claim 1, wherein the linear polyolefin has a shear stability index (SSI) of from about 3% to 25%, as measured using test method ASTM-D6278. ### Claim 5 (depends on 1) The engine oil composition of claim 1, further comprising at least one additive selected from the group consisting of dispersants, antioxidants, antiwear agents, antifoam agents, molybdenum-containing compounds, titanium-containing compounds, phosphorus-containing compounds, pour point depressants, and diluent oils. ### Claim 6 (depends on 1) A method of extending an oil drain interval of an internal combustion engine or reducing engine deposits of an internal combustion engine, the method comprising adding to the engine the engine oil composition of claim 1 and operating the engine. ### Claim 7 A process of improving resistance to engine deposits of an engine oil, the process comprising incorporating an amount of one or more zinc dialkyl dithiophosphates (ZDDP compounds) and an amount of one or more viscosity modifiers, wherein an amount of phosphorus (P) in weight percent provided to the lubricating oil composition by the one or more ZDDP compounds divided by the amount of the one or more viscosity modifiers (VM) in weight percent based on a total weight of the lubricating oil composition is a P/VM quotient of more than about 0.0115, into a base oil to form the engine oil, the viscosity modifier is a linear polyolefin consisting of ethylene and propylene and having a shear stability index (SSI) of from about 3% to less than 30%, as measured using test method ASTM-D6278, and the engine oil composition provides a result in an Average Engine Varnish test (ASTM D8256) of 9.40 or higher, and wherein the one or more ZDDP compounds comprise a ZDDP compound derived from 100% secondary alcohols which are a mixture of methyl isobutyl carbinol and isopropyl alcohol and the amount of phosphorus from the one or more ZDDP compounds is about 787 ppmw to 1200 ppmw. ### Claim 8 (depends on 1) The engine oil composition of claim 1, wherein the polyolefin has a shear stability index (SSI) of from about 3% to 25%, as measured using test method ASTM-D6278 and the polyolefin comprises about 45 to about 55 weight percent ethylene and about 55 to about 45 weight percent propylene, wherein the weight percent is based on the total weight of the olefin polymer. ### Claim 9 (depends on 7) The process of claim 7, wherein the polyolefin has a shear stability index (SSI) of from about 3% to 25%, as measured using test method ASTM-D6278 and the polyolefin consists of about 45 to about 55 weight percent ethylene and about 55 to about 45 weight percent propylene, wherein the weight percent is based on the total weight of the olefin polymer. ### Claim 10 (depends on 1) The engine oil composition of claim 1, formulated for a passenger car engine, wherein the engine oil composition has a P/VM quotient of more than about 0.0115 and less than 0.03. ### Claim 11 (depends on 7) The process of claim 7, wherein the engine is a passenger car engine, and the engine oil composition has a P/VM quotient of more than about 0.0115 and less than 0.03.