Back to results
US 8,076,274 B2Granted
Lubricating oil composition
AssigneeInfineum International Limited
InventorsRobin Howard Scott, Robert William Shaw
Life of this patent
Estimating the term…
Abstract
A lubricating oil composition for a heavy duty diesel engine comprises a base oil, at least 0.6 mass % of an ash-free antioxidant and an overbased magnesium-containing detergent. The detergent provides greater than 0.05 mass % Mg based on the mass of the composition. Bore polishing in the engine is reduced for a given level of exhaust gas ash production.
Claims13
A lubricating oil composition for a diesel engine, comprising the following components:
- (a) a lubricating oil basestock of lubricating viscosity;
- (b) an antioxidant component;
- (c) a detergent component;
- and
- optionally (d) one or more metal hydrocarbyl dithiophosphate compounds in an amount of from 0.0 to 1.8 mass % and/or (e) a calcium detergent compound;
- wherein the antioxidant component (b) is selected from one or more ash-free aminic and/or sulfur-free phenolic compounds in an amount of at least 0.6 mass % up to 3.0 mass % based on the total mass of the composition;
- and the detergent component (c) is an overbased magnesium compound having a total base number (TBN) exceeding 350 mg/g KOH selected from one or more magnesium sulfonates, magnesium salicylates, and magnesium phenates and which provide the composition with greater than 0.05 mass % Mg based on the total mass of the composition, and wherein the sulfated ash content of the composition is at least 0.6 mass % to not more than 2.0 mass % as determined by ASTM D874.
4 more elements
Dependencies are inferred from the claim text.