Lubricating Oil Composition For Automoblie Engine Lubrication.
Inactive Publication Date: 2013-09-12
CHEVRON JAPAN
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[0009]Improving engine structure is of course important as a method for improving fuel efficiency of automobile engines, but it is also known that lowering viscosity of lubricating oils is effective in improving fuel efficiency. Therefore, as previously mentioned, engine oils having an SAE viscosity grade of 5W20 and a high-temperature, high-shear (106 s1) viscosity of 2.6 mPa·s are already being used as fuel-efficient gasoline engine oils for four-wheel driv
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 therefo
Method used
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Examples 1 and 2, Comparative Examples, and Reference Examples
(1) Production of Lubricating Oil Composition
[0067]The lubricating oil composition of the present invention (SAE viscosity grade: 5W20, high-temperature, high-shear viscosity: 2.9 mPa·s or higher) was produced (Examples 1 and 2) using the following base oil and additives (in the following amounts). Moreover, a lubricating oil composition having an SAE viscosity grade of 5W20 (high-temperature, high-shear viscosity of approximately 2.6 mPa·s) was produced as a comparative example and a lubricating oil composition having an SAE viscosity grade of 10W30 (high-temperature, high-shear viscosity of 2.9 mPa·s or higher) was produced as a reference example.
(2) Base Oil
[0068]Base oil 1: Mixture (having viscosity index of 142, a dynamic viscosity at 100° C. of 4.9 mm2 / s, and NOACK evaporation loss of 10.1%) of mineral oil base oil a (having a viscosity index of 137, a dynamic viscosity at 100° C. of 4.1 mm2 / s, and a NOACK evaporati...
Example
[Organic Sulfur Compound] (Used in Example 2 Only)
[0088]Sulfurized isobutylene (S: 42 mass %)
[0089]Amount added: 0.3 mass %
[Viscosity Index-Improving Agent]
[0090]1) Polymethacrylate viscosity index-improving agent (SSI=18, mass-average molecular weight: 200,000)—used in examples 1 and 2 and comparative example[0091]Amount added: 5.1 mass % (example 1), 5.0 mass % (example 2), 5.1 mass % (Comparative example)[0092]2) Ethylene propylene copolymer viscosity index-improving agent (SSI=24)—used in Reference example[0093]Amount added: 4.6 mass %
[Pour Point Depressant]
[0094]Polymethacrylate pour point depressant: 0.3 mass %
[Other Additives]
[0095]Combination of small amounts each of additives such as anti-wear agent, anti-rust agent, defoaming agent, and the like
[0096]Amount added: 0.6 mass %
Evaluation of Lubricating Oil Composition
[0097](1) Viscosity properties of lubricating oil composition (high-temperature, high-shear viscosity, dynamic viscosity (at 100° C. and 40° C.), viscosity index...
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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 ...
Claims
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