•  Calculates the engine oil replacement period as an appropriate target period for replacing the engine oil.

•  The PCM calculates the travelled distance and the number of elapsed days since the engine oil maintenance monitor function was activated, and if the travelled distance and number of elapsed days exceeds the specified value, it determines that engine oil replacement period is reached.

•  The PCM determines engine oil deterioration using information other than the travelled distance and the number of elapsed days. When the PCM determines engine oil deterioration, it determines that the engine oil replacement period has been reached. (Flexible)

•  When the PCM determines that the engine oil replacement period has been reached, the wrench indicator light illumination request signal is sent to the instrument cluster. (See WRENCH INDICATOR LIGHT [SKYACTIV-D 1.5].)