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US 6,645,923 B2Granted
Lubricating oil composition
AssigneeInfineum International Limited
InventorsAdrian Dunn, Laurent Chambard, Terence Garner
Life of this patent
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Abstract
A gas-fuelled engine lubricating oil composition having a TBN in the range of 2 to 20 and comprising: (A) oil of lubricating viscosity; (B) a salicylate detergent having a TBN of 95 or less; (C) a detergent having a TBN of greater than 250; (D) an ashless dispersant; and (E) an anti-wear additive.
Claims10
A gas-fuelled engine lubricating oil composition having a TBN in the range of 2 to 20 comprising:
- (A) oil of lubricating viscosity, in a major amount;
- and added thereto, in respective minor amounts;
- (B) one or more metal hydrocarbyl-substituted salicylate detergents having a TBN of 95 or less;
- and
- (C) one or more single surfactant salicylate detergents or complex metal detergents containing salicylate surfactant, having a TBN of greater than 250;
- wherein the lubricating oil composition is substantially free of single surfactant, sulfonate detergents.
3 more elements
An additive package or concentrate for a gas-fuelled engine lubricating oil composition, comprising:
- (B) one or more metal hydrocarbyl-substituted salicylate detergents having a TBN of 95 or less;
- and
- (C) one or more single surfactant salicylate detergents or complex metal detergents containing salicylate surfactant, having a TBN of greater than 250;
- wherein the addivive package or concentrate is substantially free of single surfactant, sulfonate detergents.
1 more element
Dependencies are inferred from the claim text.