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Development of Engine Oil Deterioration Monitoring System

Article of Honda R&D Technical Review Vol.15 No.2


An oil deterioration monitoring system has been developed to enable the necessary intervals between oil changes to be judged with greater accuracy. The system calculates oil life using an oil deterioration algorithm. When the figure reaches a predetermined value, the meter displays a recommendation for oil change. The algorithm first estimates oil temperature, a parameter of the oil deterioration coefficient. The coefficient and engine speed are then used to calculate how much of the oil’s usable life has been expended. The oil deterioration coefficient, which is dependent on oil temperature, was found from oil life in endurance tests conducted with oil at differing average temperatures. A market survey was conducted to verify the applicability of the measure to a variety of driving modes, and results were reflected in calculations of oil life. It has been demonstrated that this system is successful in enabling U.S. users to change their oil at more appropriate intervals.


(1) Murakami, Y., Matsumoto, E., Nogami, Y.: Research and Development of an Oil Deterioration Sensor, Nissan Gihou, No. 30, P. 92-98 (1991)
(2) Greenberg, A.: Cost Puts Direct Oil Condition Sensing in Back Seat, Automotive Electronics Journal, January 15th, p. 9, 12 (1990)
(3) Kauffman, R. E.: Development of a Remaining Lubricant Evaluation Technique. Part: Cyclic Voltammetric Methods, Lub. Eng., 45-11, p. 709 (1988)
(4) Schwartz, S., Smolenski, D. J.: Development of an Automatic Engine Oil-Change Indicator System, SAE Paper, No. 870403

Author (organization or company)

Nobuaki TAKAOKA(Tochigi R&D Center)、Hiroshi HASHIMOTO(Tochigi R&D Center)、Akihisa SAIITO(Tochigi R&D Center)、Hiroshi KUBO(Tochigi R&D Center)、Syouji KAWAUCHI(Tochigi R&D Center)、Tsuyoshi EGUCHI(Tochigi R&D Center)

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