Mixed TBN detergents and lubricating oil compositions containing such detergents
OwnerDouglas Edward Deckman, Mark D. Winemiller +3inventors
InventorsDouglas Edward Deckman, Mark D. Winemiller, William L. Maxwell, William H. Buck, David J. Baillargeon
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Abstract
The present invention concerns a detergent additive for lubricating oil compositions comprising at least two of low, medium, and high TBN detergents. Preferably the detergent is a calcium salicylate. The present invention also concerns lubricating oil compositions comprising such detergents, and at least one of Group II base stock, Group III base stock, or wax isomerate base stock.
Claims18
A detergent additive for use in a lubricating oil composition comprising at least two of:
- (a) a detergent having a TBN of over about 200,
- (b) a detergent having a TBN between about 100 and 200;
- and
- (c) a detergent having a TBN less than about 100.
A lubricating oil composition which comprises:
- (a) an oil of lubricating viscosity;
- and
- (b) at least two of:
- (i) a detergent having a TBN of over about 200,
- (ii) a detergent having a TBN between about 100 and 200;
- and
- (iii) a detergent having a TBN less than about 100.
A method for improving the viscosity increase of a lubricating oil composition in a 3-hour Noack test comprising the step of adding to an oil of lubricating viscosity at least two of:
- (i) a salicylate detergent having a TBN of over about 200,
- (ii) a salicylate detergent having a TBN between about 100 and 200;
- and
- (iii) a salicylate detergent having a TBN less than about 100.
A method for improving piston cleanliness and ring sticking of a lubricating oil composition comprising the step of adding to an oil of lubricating viscosity at least two of:
- (i) a salicylate detergent having a TBN of over about 200,
- (ii) a salicylate detergent having a TBN between about 100 and 200;
- and
- (iii) a salicylate detergent having a TBN less than about 100.
Dependencies are inferred from the claim text.