Claims
- 1. A lubricating oil additive composition comprising:
(a) one or more ethylene carbonate-treated succinimides, (b) one or more borated succinimides, and (c) one or more phenolic antioxidants selected from those of the formulae: 5wherein each R is an alkyl group of 7 to 9 carbon atoms.
- 2. The lubricating oil additive composition of claim 1, wherein the phenolic antioxidant is:
- 3. The lubricating oil additive composition of claim 1, wherein the phenolic antioxidant is:
- 4. The lubricating oil additive composition of claim 1, wherein the ethylene carbonate-treated succinimide is a polybutene succinimide derived from the reaction product of a polyisobutenyl succinic anhydride with a polyamine.
- 5. The lubricating oil additive composition of claim 4, wherein the ethylene carbonate-treated succinimide is derived from polybutenes having a molecular weight of from at least 1800.
- 6. The lubricating oil additive composition of claim 1, wherein the borated succinimide is derived from the reaction product of a polyisobutenyl succinic anhydride with a polyamine.
- 7. The lubricating oil additive composition of claim 6, wherein the borated succinimide is derived from polybutenes having a molecular weight of from 1200 to 1400.
- 8. A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and a minor amount of the lubricating oil additive composition comprising:
(a) one or more ethylene carbonate-treated succinimides, (b) one or more borated succinimides, and (c) one or more phenolic antioxidants selected from those of the formulae: 8wherein each R is an alkyl group of 7 to 9 carbon atoms.
- 9. A method of lubricating an engine comprising operating the engine with a lubricating oil composition claim 8.
- 10. A method for reducing valve train wear in diesel engines comprising lubricating the diesel engine with the lubricating oil composition of claim 8.
- 11. A method for controlling bearing corrosion in diesel engines comprising lubricating the diesel engine with the lubricating oil composition of claim 8.
- 12. A method for reducing piston deposit formation in diesel engines comprising lubricating the diesel engine with the lubricating oil composition of claim 8.
Parent Case Info
[0001] This application claims the benefit of priority from U.S. Provisional Application No. 60/357,028, filed Feb. 14, 2002.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60357028 |
Feb 2002 |
US |