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There is considerable pressure to reduce particulate matters, nitrogen oxides and other toxic substances in the emissions of internal combustion engines. In order to protect particulate filters and de-NOx catalysts in the exhaust gas flow, designers have sought to reduce sulfated ash, phosphorous and sulphur (SAPS) in lubricating oils. Also, the drive to reduce energy consumption has seen the reduction of oil viscosities. This paper examines the way viscosity and volatility influence lubricating oil consumption (LOC).