US 8,076,274 B2 | Lubricating oil composition

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US 8,076,274 B2

Lubricating oil composition

Tech Center:

1700 Chemical and Materials Engineering

Examiner:

Michael Marcheschi

Art Unit:

1775 Chemical Apparatus, Separation and Purification, Liquid and Gas Contact Apparatus

Agent:

INFINEUM INTERNATIONAL LIMITED

Inventors:

Robin Howard Scott; Robert William Shaw

Assignee:

INFINEUM INTERNATIONAL LIMITED

Priority:

07/20/06

Filed:

07/10/07

Granted:

12/13/11

Expiration:

01/15/24

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.

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