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Development of Ultra Low Viscosity 0W-8 Engine Oil
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
In the automotive industry, electrification of vehicles such as HVs, PHVs, FCs and EVs is in progress in order to cope with the serious global environmental problems. On the other hand, in 2030, 70% of vehicles are expected to be equipped with internal combustion engines. Therefore, further fuel consumption improvement of the internal combustion engine is indispensable for CO2 reduction. Although lowering the viscosity of engine oil is an effective way to improve fuel consumption, but lowering the viscosity is also a concern for decreased in the wear resistance. Therefore, it is important to achieve both improved fuel efficiency and reliability. We have developed new 0W-8 engine oil of ultra-low viscosity, and achieved an improvement in fuel efficiency by 0.8% compared to the commercial 0W-16 engine oil. For new this oil, we reduced the friction force under boundary lubrication by applying an oil film former and calcium borate detergent. This oil film former is increased the film thickness without increasing the oil viscosity. The calcium borate detergent enhances the friction reduction effect of MoDTC. By applying these technologies, we have succeeded in developing the engine oil that compatibly achieve fuel efficiency and reliability. The developed oil also meets the new JASO GLV-1 specification.