Impact of Engine Oil Volatility on Oil Consumption and Emissions
Reduction of engine lubricant viscosity has a direct influence in decreasing engine friction. Therefore, the shift to low-viscosity grade lubricant contributes to limiting CO2 emissions. These ultra-low viscosity lubricants might require the introduction of low-viscosity base oils. It is essential to evaluate the impact of high volatility components on oil consumption and estimate the impact on oil drain intervals.
In this study, a series of 0W-8 to 0W-20 prototype engine oils has been evaluated on a downsized turbocharged direct injection gasoline engine. Oil emission and particle emission were measured. The impact of formulation and lubricant properties was explored. Engine oil with Noack volatility greater than 30% exhibited no increase in oil emission or particle emission for most operating points.