Lubricating Oil Composition

• US 20110245120A1
• Filed: 03/30/2011
• Published: 10/06/2011
• Est. Priority Date: 03/31/2010
• Status: Abandoned Application

• Current Assignee: Daniel Whyte, Matthew D. Irving, Richard D. Bertram
• Original Assignee: Daniel Whyte, Matthew D. Irving, Richard D. Bertram
• Inventors: Irving, Matthew D., Whyte, Daniel, Bertram, Richard D.
• Application Number:
  US13/075,223
• Publication Number:
  US 20110245120A1
• Time in Patent Office: Days
• US Class Current: 508/287
• 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 167/00 Lubricating compositions characterised by the additive being a mixture of a macromolecular compound, a non-macromolecular compound and a compound of unknown or incompletely defined constitution, each of these compounds being essential
• CPC Class Codes: C10M 2203/10 Petroleum or coal fractions, e.g. tars, solvents, bitumen
• CPC Class Codes: C10M 2203/102 Aliphatic fractions
• CPC Class Codes: C10M 2207/262 derived from hydroxy substituted aromatic acids, e.g. salicylates
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2219/046 Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2219/068 Thiocarbamate metal salts
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10M 2227/09 Complexes with metals
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2010/12 Groups 6 or 16
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• CPC Class Codes: C10N 2030/02 Pour-point; Viscosity index
• CPC Class Codes: C10N 2030/06 Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2030/12 Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
• CPC Class Codes: C10N 2030/40 Low content or no content compositions
• 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 2030/45 Ash-less or low ash content
• CPC Class Codes: C10N 2030/72 : Extended drain
• CPC Class Codes: C10N 2040/25 : Internal-combustion engines
• CPC Class Codes: C10N 2040/252 : Diesel engines

Abstract

A lubricating oil composition having a phosphorus content of up to 0.12 wt %, a sulfated ash content of up to 1.2 wt % comprising (a) a major amount of an oil of lubricating viscosity; (b) an alkali metal or alkaline earth metal alkyl salicylate lubricating oil detergent providing from 7-15 mmol salicylate soap per kilogram of lubricating oil composition; (c) one or more dispersants providing the lubricating oil composition with from at least 0.12 wt % to 0.20 wt % atomic nitrogen, based on the weight of the lubricating oil composition, and (d) a dispersant-viscosity modifier.

Claims

1. A lubricating oil composition having a phosphorus content of up to 0.12 wt % and a sulfated ash content of up to 1.2 wt % comprising:

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

(b) an alkali metal or alkaline earth metal alkyl salicylate lubricating oil detergent providing from about 7 to about 15 mmol salicylate soap per kilogram of lubricating oil composition;

(c) one or more ashless, nitrogen-containing dispersants providing the lubricating oil composition with from at least about 0.12 wt % to about 0.20 wt % atomic nitrogen, based on the weight of the lubricating oil composition, and

(d) a dispersant-viscosity modifier.

2. A lubricating oil composition according to claim 1, wherein the phosphorous content is no more than 0.08 wt %.

3. A lubricating oil composition according to claim 1, wherein the sulfated ash content is no more than 1.0 wt %.

4. A lubricating oil composition according to claim 1, wherein the alkali metal or alkaline earth metal alkyl salicylate lubricating oil detergent providing from about 8 to about 11 mmol salicylate soap per kilogram of lubricating oil composition.

5. A lubricating oil composition according to claim 1, wherein the one or more dispersants provide the lubricating oil composition with from at least about 0.12 wt % to about 0.17 wt % atomic nitrogen, based on the weight of the lubricating oil composition.

6. A lubricating oil composition according to claim 1, wherein the alkali metal or alkaline earth metal alkyl salicylate is calcium or magnesium salicylate or a combination thereof.

7. A lubricating oil composition according to claim 1, further comprising an alkaline earth metal alkyl sulphonate lubricating oil detergent.

8. A lubricating oil composition according to claim 1, wherein the dispersant is a polyisobutenyl succinimide dispersant.

9. A lubricating oil composition according to claim 1 which meets the requirements of both the API-CJ4 specification and the ACEA E6 specification.

10. A method of lubricating a vehicle engine comprising an exhaust gas recirculation (EGR) system comprising use in that engine of a lubricating oil composition according to claim 1.

11. A method according to claim 10, wherein the engine is a compression ignition engine.

12. A method according to claim 11, wherein the engine is a heavy duty diesel engine.

13. A method according to claim 10, wherein the engine further comprises a selective catalytic reduction device.