Patent ID: 8312847

Claim:
A diluting fuel-in-oil treating apparatus of an internal combustion engine comprising: a cross-flow filtration fuel separator having a separation membrane that separates by permeation, fuel from lubricating oil flowing in an oil circuit of the internal combustion engine; a vapor-liquid separator that separates the fuel separated by the cross-flow filtration fuel separator into a gas component and a liquid component; a fuel collector that collects the gas component of the fuel separated by the vapor-liquid separator; an oil path that connects an oil container to a lubricated part of the internal combustion engine and constituting the oil circuit, a portion of the lubricating oil from the oil path being dischargeable to the cross-flow filtration fuel separator; and a path that connects the fuel collector to a downstream side of a throttle valve of an air intake pipe of the internal combustion engine such that the collected gas component of the fuel collector is introducible into the air intake pipe.