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Lubricating oil composition for lubricating automotive engines

A technology for lubricating oil composition and engine, applied in the directions of lubricating composition, petroleum industry, additives, etc., can solve the problems of inability to provide high temperature-high shear viscosity, etc., and achieve the effects of good fuel economy and good wear inhibition

Active Publication Date: 2012-08-01
CHEVRON JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been noted that known engine oils of SAE viscosity grade 0W20 do not provide such high temperature-high shear viscosities

Method used

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  • Lubricating oil composition for lubricating automotive engines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、2

[0080] [embodiment 1, 2, comparative example & reference example]

[0081] (1) Preparation of lubricating oil composition

[0082] The lubricating oil composition of the present invention (SAE viscosity grade: 0W20, high temperature high shear viscosity: 2.9 mPa·s or higher) was prepared using the following additives and base oil in Examples 1 and 2. In a comparative example, a lubricating oil composition (SAE viscosity grade: 0W20, high-temperature high-shear viscosity: 2.6 mPa·s) was prepared. In the reference example, a lubricating oil composition (SAE viscosity grade: 10W30, high-temperature high-shear viscosity: 2.9 mPa·s or higher) was prepared.

[0083] (2) Base oil

[0084] Base oil-1: a mixture of base oil (a) and base oil (b) in a weight ratio of 60:40 (base oil (a): base oil (b), viscosity index: 142; kinematic viscosity at 100°C : 4.9mm 2 / s; NOACK evaporation loss: 10.1%), wherein the base oil (a) is a mineral oil-derived base oil prepared by subjecting slack ...

Embodiment 1

[0104] Example 1 (amount: 5.4wt.%), embodiment 2 (amount: 5.5wt.%) and the polymethacrylate viscosity index improver (SSI=23 ).

[0105] The ethylene-propylene copolymer viscosity index improver (SSI=24) used in the reference example (amount: 4.5 wt.%).

[0106] [Pour point depressant]

[0107] Polymethacrylate pour point depressant: 0.3 wt.%.

[0108] [auxiliary additive]

[0109] For all examples, the sum of small amounts of friction modifiers, rust inhibitors, defoamers, etc.: 0.6 wt.%

[0110] Evaluation of Lubricating Oil Compositions

[0111] Each lubricating oil composition was subjected to a Shell Four Ball Test under conditions of an oil temperature of 75° C., a load of 40 kgf, and rotation at 1,200 rpm for 60 minutes to evaluate its wear inhibiting performance. Wear inhibition performance was evaluated by measuring the wear scars formed on the surface of the tested balls.

[0112] Table 1 shows the physical properties of the lubricating oil compositions of Exam...

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Abstract

A lubricating oil composition of SAE viscosity grade 0W20 which comprises a base oil and additive components comprising a nitrogen-containing ashless dispersant, an alkaline earth metal-containing detergent, a phosphorus-containing wear inhibitor, an oxidation inhibitor and a viscosity index improver and which shows a viscosity index of 200-240, a HTHS viscosity of not less than 2.9 mPas s at 150 DEG C. and a Noack evaporation loss of not more than 13% favorably gives a high fuel economy and high wear inhibition to a four cycle gasoline engine of motorcycles and a diesel engine mounted on motor cars equipped with an exhaust gas post-processing apparatus.

Description

field of invention [0001] The present invention relates to a lubricating oil composition of low viscosity type for lubricating automotive engines, which exhibits good fuel economy. In more detail, the present invention relates to a low-viscosity lubricating oil composition for lubricating motor vehicle engines which, while providing good fuel economy, also exhibits high wear-inhibiting properties. In particular, the lubricating oil composition of the present invention can be advantageously used for lubricating four-stroke gasoline engines of motorcycles and diesel engines mounted on motor cars equipped with exhaust gas after-treatment equipment. Background of the invention [0002] In recent years, demands for improving the fuel economy of automobiles have increased remarkably. As lubricating oil compositions to be used for lubricating engines installed in gasoline engine-mounted automobiles and diesel engine-mounted automobiles, low-viscosity type engine oils providing goo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M161/00C10N40/25
CPCC10N2240/103C10M2205/022C10M2219/044C10M2203/1025C10M169/04C10N2230/74C10M2215/28C10M2209/084C10N2230/02C10M2207/028C10N2240/104C10M2215/064C10N2230/06C10N2230/52C10M2205/163C10N2230/08C10M2223/045C10M2219/022C10N2220/022C10N2230/54C10N2020/02C10N2030/02C10N2030/08C10N2030/52C10N2030/54C10N2030/74C10N2030/06C10N2040/253C10N2040/255C10M2205/024C10N2010/04C10N2060/06C10N2060/14
Inventor 安藤广木仲里森国
Owner CHEVRON JAPAN
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