2020 Volume 65 Issue 8 Pages 478-484
Active technology developments for improving thermal efficiency of internal combustion engine are being carried out to take action to combat climate change. Fuel economy lubricant is one effective technology for improving fuel economy of vehicles, and lowering viscosity is a first approach for this purpose by reducing hydrodynamic resistance of lubricant. On the other hand, low viscosity lubricant generate more boundary contact resistance, and it makes friction modifier more important for reducing friction loss in engines. In this article, the technology related to MoDTC which is popular friction modifier for fuel economy engine oil, will be introduced mainly including combination effect with other components in lubricants and interaction with surface treatments. Recent studies with polymer type friction modifiers which is becoming new group of friction modifiers are also shown. The author believes that improving technology of friction modifiers will contribute to minimize greenhouse gas emission from vehicles, and reduce an impact of our society on climate change which is one of the largest technological challenges that we are facing.