Diluting fuel-in-oil treating apparatus of internal combustion engine

A diluting fuel-in-oil treating apparatus of an internal combustion engine comprising:

• an oil container configured to contain lubricating oil of the internal combustion engine;
• an oil path configured to connect the oil container to lubricated parts of the internal combustion engine;
• an oil pump provided in the oil path and configured to supply the lubricating oil from the oil container to the lubricated parts of the internal combustion engine;
• a bypass path having a first end connected to a downstream side of the oil pump of the oil path and a second end connected to an upstream side of the oil pump;
• a fuel separator provided in the bypass path and configured to separate fuel from the lubricating oil flowing in the bypass path;
• and
• an open/close valve provided in the bypass path and configured to open and close the bypass path based on one of a temperature of the lubricating oil and a physical quantity of the lubricating oil having a correlation with the temperature.