Lubricating Oil Composition For Automoblie Engine Lubrication.

Abstract

Provided is a lubricating oil composition that is highly fuel-efficient and has high wear resistance and is particularly suited for lubrication of a motorcycle four-cycle gasoline engine or a diesel engine vehicle having an exhaust gas after-treatment device. The lubricating oil composition, which is a lubricating oil composition having an SAE viscosity grade of 5W20, comprises a base oil and predetermined amounts of additive components comprising of a nitrogen-containing ash-free dispersant, an alkali earth metal-containing detergent, a phosphorus-containing anti-wear agent, an antioxidant, and a viscosity index-improving agent, wherein the viscosity index is within a range of 140 to 230, the high-shear viscosity at 150° C. is 2.9 mPa·s or higher, and the NOACK evaporation loss is 13% or less.

Description

[0001]This application claims priority to Japanese Patent Application number JP 2012-51849 which was filed on Mar. 8, 2012.FIELD OF INVENTION[0002]The present invention relates to an excellent fuel-efficient, low-viscosity lubricating oil composition for an automobile engine, and in particular, relates to a lubricating oil composition for automobile engine lubrication that, while being an excellent fuel-efficient, low-viscosity lubricating oil composition for engine lubrication, also shows high wear resistance. The present invention relates to a low-viscosity lubricating oil composition that is particularly suitable for lubricating a motorcycle four-cycle gasoline engine or a diesel engine having an exhaust gas after-treatment device.BACKGROUND OF INVENTION[0003]There is an increasing demand for improved fuel efficiency in automobiles. Therefore, there is a need for an excellent fuel-efficient, low-viscosity engine oil as the lubricating oil composition (engine oil) that is used to ...

AI Technical Summary

Benefits of technology

The patent is about a new type of lubricating oil that can be made to have a specific viscosity and index, as well as low evaporation and wear resistance. This is done by using a specific type of oil and optimizing the combination of additives and amounts. This new lubricating oil has improved fuel efficiency and can be made with existing technology.

Problems solved by technology

Nevertheless, fuel-efficient gasoline engine oils for four-wheel drive vehicles having an SAE viscosity grade of 5W20 cannot be expected to have a high-temperature, high-shear viscosity that is as high as 2.6 mPa·s and therefore, there is a problem in that when used as the engine oil of a motorcycle four-cycle gasoline engine that uses engine oil for lubrication of the transmission system, there is a problem in that wear resistance is insufficient.