Mixed TBN detergents and lubricating oil compositions containing such detergents
OwnerDouglas E. Deckman, Mark D. Winemiller +3inventors
InventorsDouglas E. 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.
Claims20
A detergent additive for use in a lubricating oil composition comprising at least two detergents selected from a group consisting of:
- (a) a first detergent having a TBN of over about 200,
- (b) a second detergent having a TBN between about 100 and 200;
- and
- (c) a third 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 detergents selected from a group consisting of:
- (i) a first detergent having a TBN of over about 200,
- (ii) a second detergent having a TBN between about 100 and 200;
- and
- (iii) a third 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 items selected from a group consisting of:
- (i) a first salicylate detergent having a TBN of over about 200,
- (ii) a second salicylate detergent having a TBN between about 100 and 200;
- and
- (iii) a third 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 items selected from a group consisting of:
- (i) a first salicylate detergent having a TBN of over about 200,
- (ii) a second salicylate detergent having a TBN between about 100 and 200;
- and
- (iii) a third salicylate detergent having a TBN less than about 100.
A method for improving film forming tendency of a lubricating oil composition comprising the step of adding to an oil of lubricating viscosity at least two items selected from a group consisting of:
- (i) a first salicylate detergent having a TBN of over about 200,
- (ii) a second salicylate detergent having a TBN between about 100 and 200;
- and
- (iii) a third salicylate detergent having a TBN less than about 100.
A method for improving frictional properties of a lubricating oil composition comprising the step of adding to an oil of lubricating viscosity at least two items selected from a group consisting of:a first salicylate detergent having a TBN of over about 200, (ii) a second salicylate detergent having a TBN between about 100 and 200;
- and
- (iii) a third salicylate detergent having a TBN less than about 100.
Dependencies are inferred from the claim text.