Patent ID: 8887689

Claim:
An oil deterioration suppressing apparatus for an internal combustion engine comprising: an oil reservoir section for reserving oil; a filtering component provided in an oil passage through which oil can flow, the filtering component being configured to remove unnecessary products from the oil; an adsorption component provided in the oil passage to be positioned upstream of the filtering component, the adsorption component being configured to adsorb a predetermined acid component in the oil; a supply device for supplying the oil in the oil reservoir section to a side upstream of the adsorption component and the filtering component; a bypass passage formed to bypass the filtering component; a bypass valve provided in the bypass passage; and a control unit configured to control an operation of the bypass valve; wherein the control unit controls the bypass valve in such a manner that the bypass valve is open during an operation of the internal combustion engine, and controls the bypass valve in such a manner that the bypass valve closes when the internal combustion engine is stopped, and the supply device supplies the oil in the oil reservoir section to a side upstream of the adsorption component when the internal combustion engine is stopped.