Development of ultra low viscosity 0W-8 engine oil
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.