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자동차 엔진오일의 사용전후에 대한 점도 및 점도지수 변화에 대한 실험적 고찰
최영아,이재호,정석민,김종수 한국해양대학교 산업기술연구소 2001 연구논문집 Vol.18 No.-
The present work is investigated into the changes in the viscosity and viscosity index of automobile engine oils. To measure the viscosity of used engine oils, we sampled the engine oils from several cars with shorter or longer travel distance. Kinematic viscosity of both the new and used engine oils are measured as the change of temperature. The results are shown that the viscosity of the used oils obtained from the car with a shorter travel distance are decreased than that of new oils, and the viscosity index of it is higher than the new oils. But for the engine oils sampled from the cars with a longer travel distance, the viscosity is increased and the viscosity index is lower than the new oils.