LUBRICATING OIL COMPOSITIONS

• US 20150307802A1
• Filed: 04/29/2014
• Published: 10/29/2015
• Est. Priority Date: 04/29/2014
• Status: Active Grant

• Current Assignee: Infineum International Limited (Infineum)
• Original Assignee: Infineum International Limited (Infineum)
• Inventors: Ritchie, Andrew J. D., Gutierrez, Jose A., Boese, Doyle
• Granted Patent: US 11,034,912 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• CPC Class Codes: C10M 171/00 Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated chemically defined ingredients C10M101/00 - C10M169/00; petroleum fractions C10M101/02, C10M121/02, C10M159/04
• CPC Class Codes: C10M 2201/05 Metals; Alloys
• CPC Class Codes: C10M 2201/084 containing sulfur, selenium or tellurium sulfides, tellurides, selenides C10M2201/065
• CPC Class Codes: C10M 2207/023 having hydroxy groups bound to carbon atoms of six-membered aromatic rings
• CPC Class Codes: C10M 2207/028 Overbased salts thereof
• CPC Class Codes: C10M 2207/141 monocarboxylic
• CPC Class Codes: C10M 2207/142 polycarboxylic
• CPC Class Codes: C10M 2207/144 containing hydroxy groups
• CPC Class Codes: C10M 2207/262 derived from hydroxy substituted aromatic acids, e.g. salicylates
• CPC Class Codes: C10M 2219/044 Sulfonic acids, Derivatives thereof, e.g. neutral salts
• CPC Class Codes: C10M 2219/046 Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2010/12 Groups 6 or 16
• CPC Class Codes: C10N 2030/00 Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
• CPC Class Codes: C10N 2030/45 Ash-less or low ash content
• CPC Class Codes: C10N 2040/25 Internal-combustion engines
• CPC Class Codes: C10N 2040/255 Gasoline engines

Abstract

A method of preventing or reducing the occurrence of Low Speed Pre-Ignition (LSPI) in a direct-injected, boosted, spark-ignited internal combustion engine that, in operation, generates a break mean effective pressure level of greater than about 15 bar, at an engine speed of from about 1500 to about 2500 rotations per minute (rpm), in which the crankcase of the engine is lubricated with a lubricating oil composition containing at least about 0.2 mass % of magnesium sulfated ash.

Claims

1. A method of preventing or reducing the occurrence of Low Speed Pre-Ignition (LSPI) in a direct-injected, boosted, spark-ignited internal combustion engine that, in operation, generates a break mean effective pressure level of greater than about 15 bar, at an engine speed of from about 1500 to about 2500 rotations per minute (rpm), which method comprises the step of lubricating the crankcase of the engine with a lubricating oil composition containing at least about 0.2 mass %, based on the total mass of the lubricating oil composition, of magnesium sulfated ash.

2. A method, as claimed in claim 1, wherein said engine generates a break mean effective pressure level of greater than about 20 bar, at an engine speed of from about 1500 to about 2500 (rpm).

3. A method, as claimed in claim 1, wherein said engine generates a break mean effective pressure level of greater than about 15 bar, at an engine speed of from about 1500 to about 2000.

4. A method, as claimed in claim 1, wherein said lubricating oil composition further contains a zinc-phosphorous compound in an amount introducing an amount of phosphorus within 100 ppm of the maximum amount of phosphorus allowed by industry standards for passenger car motor oils (PCMO).

5. A method, as claimed in claim 1, wherein said lubricating oil composition further contains a zinc-phosphorous compound in an amount introducing from about 700 to about 800 ppm of phosphorus.

6. A method, as claimed in claim 1, wherein said lubricating oil composition contains less than about 0.4 mass %, based on the total mass of the lubricating oil composition, of calcium sulfated ash.

7. A method, as claimed in claim 1, wherein said magnesium sulfated ash is introduced into said lubricating oil composition by one or more magnesium detergents.

8. A method, as claimed in claim 1, wherein said lubricating oil composition further contains at least 50 ppm of molybdenum, based on the total mass of the lubricating oil composition.

9. A method, as claimed in claim 1, wherein said lubricating oil composition has a total sulfated ash content of no greater than 1.2 mass %, based on the total mass of the lubricating oil composition.