Lubricating oil compositions

• US 7,018,958 B2
• Filed: 10/22/2002
• Issued: 03/28/2006
• Est. Priority Date: 10/22/2002
• Status: Expired due to Term

• Current Assignee: Infineum International Limited (Infineum)
• Original Assignee: Infineum International Limited (Infineum)
• Inventors: Arrowsmith, Stephen, Diggs, Nancy Z., Ritchie, Andrew J. D., Pain, Jorge O.
• Primary Examiner(s): McAvoy, Ellen M.
• Application Number:
  US10/277,295
• Publication Number:
  US 20040077506A1
• Time in Patent Office: 1,253 Days
• Field of Search: 508/185
• US Class Current: 508/185
• CPC Class Codes: C10M 141/10 at least one of them being an organic phosphorus-containing compound
• CPC Class Codes: C10M 141/12 at least one of them being an organic compound containing atoms of elements not provided for in groups C10M141/02 - C10M141/10
• CPC Class Codes: C10M 163/00 Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 2201/04 Elements
• CPC Class Codes: C10M 2201/087 Boron oxides, acids or salts
• CPC Class Codes: C10M 2207/023 having hydroxy groups bound to carbon atoms of six-membered aromatic rings
• CPC Class Codes: C10M 2207/026 with tertiary alkyl groups
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2217/043 Mannich bases
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2020/00 Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
• CPC Class Codes: C10N 2030/38 Catalyst protection, e.g. in exhaust gas converters
• CPC Class Codes: C10N 2030/42 Phosphor free or low phosphor content compositions
• CPC Class Codes: C10N 2030/43 Sulfur free or low sulfur content compositions
• CPC Class Codes: C10N 2030/50 Emission or smoke controlling properties
• CPC Class Codes: C10N 2030/52 Base number [TBN]
• CPC Class Codes: C10N 2040/252 Diesel engines
• CPC Class Codes: C10N 2060/14 by boron or a compound containing boron

Abstract

A lubricating oil composition having a total base number of at least about 8, comprising a major amount of oil of lubricating viscosity; an amount of one or more dihydrocarbyl dithiophosphate metal salt introducing into the lubricating oil composition no more than 0.06 wt. % of phosphorus; at least 1.2 wt. % of hindered phenol antioxidant; and boron, and/or a boron-containing compound or compounds in an amount providing the lubricating oil composition with at least 200 ppm by weight of boron, all weight percentages being based on the total weight of the lubricating oil composition.

Claims

1. A method of operating a heavy duty diesel engine equipped with an aftertreatment device containing an oxidation and/or reduction catalyst, which method comprises lubricating said engine with a lubricating oil composition having a TBN of at least about 8, said composition comprising:

(a) a major amount of oil of lubricating viscosity;

(b) an amount of one or more dihydrocarbyl dithiophosphate metal salt introducing into said lubricating oil composition no more than 0.06 wt. % of phosphorus;

(c) at least 1.2 wt. % of hindered phenol antioxidant;

(d) boron, and/or a boron-containing compound or compounds in an amount providing said lubricating oil composition with at least 200 ppm by weight of boron; and

(e) a minor amount of detergent.

2. The method of claim 1, wherein said lubricating oil composition is an API CI-4 lubricating oil.

3. The method of claim 1, wherein said hindered phenol antioxidant is present in an amount of at least 1.4 wt. %.

4. The method of claim 1, wherein said lubricating oil composition has at least one of:

(a) a phosphorus content of no more than 0.05 wt. %; and

(b) a sulfur content of less than about 1.0 wt. %.

5. The method of claim 4, wherein said lubricating oil composition has at least one of:

(a) a phosphorus content of from about 0.02 to about 0.05 wt. %; and

(b) a sulfur content of less than about 0.06 wt. %.

6. A heavy duty diesel engine equipped with an aftertreatment device containing an oxidation and/or reduction catalyst, which engine is lubricated with a lubricating oil composition having a TBN of at least about 8, said composition comprising:

(a) a major amount of oil of lubricating viscosity;

(b) an amount of one or more dihydrocarbyl dithiophosphate metal salt introducing into said lubricating oil composition no more than 0.06 wt. % of phosphorus;

(c) at least 1.2 wt. % of hindered phenol antioxidant;

(d) boron, and/or a boron-containing compound or compounds in an amount providing said lubricating oil composition with at least 200 ppm by weight of boron; and

(e) a minor amount of a detergent.

7. The engine of claim 6, wherein said lubricating oil composition is an API CI-4 lubricating oil.

8. The engine of claim 6, wherein said hindered phenol antioxidant is present in said lubricating oil composition in an amount of at least 1.4 wt. %.

9. The engine of claim 6, wherein said lubricating oil composition has at least one of:

(a) a phosphorus content of no more than 0.05 wt. %; and

(b) a sulfur content of less than about 1.0 wt. %.

10. The engine of claim 9, wherein said lubricating oil composition has at least one of:

(a) a phosphorus content of from about 0.02 to about 0.05 wt. %; and

(b) a sulfur content of less than about 0.06 wt. %.