Effect of Viscosity Modifiers on the tribofilms formed using low viscosity internal combustion engine oil.

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Due to new CO2 emission regulations by regions and countries such as Europe and China, more and more OEMs are having to find new ways to decrease their CO2 emissions and increase fuel economy. The main way of accomplishing this is to use lower viscosity oils. Choosing this method puts an empathise on the additives used in these oils. Viscosity modifiers and boundary additives are of the upmost importance here. Therefore, the need to understand their interactions with each other becomes increasing large. Potentially using certain viscosity modifiers could decrease the contents of the tribofilm or alter the properties in a negative way, promoting unwanted friction and wear. If we can fully understand these interactions, then the aim of reducing CO2 emissions and increasing fuel economy can be met without increasing the tribological issues that comes with decreasing viscosity. Then the question will be how low can viscosity go without damaging the engine.