Device for preventing dilution of engine oil

A method for preventing dilution of engine oil, the method comprising:

• recovering oil for engine lubrication along with fuel in an oil pan;
• purifying exhaust gas at an exhaust purifier provided on a rear end of the engine;
• guiding flow of exhaust gas passing through the exhaust purifier to the oil pan;
• and
• controlling a flow rate of exhaust gas, the flow rate depending on a temperature of oil in the oil pan to maintain the temperature of the oil equal to or higher than a temperature at which the fuel in the oil pan is vaporized.

A device for preventing dilution of engine oil, the device comprising:

• an oil pan in which oil for engine lubrication is recovered along with fuel;
• an exhaust purifier provided on a rear end of the engine;
• a gas passage located to guide flow of exhaust gas passing through the exhaust purifier to through the oil pan, the oil and the fuel in the oil pan can be heated by exhaust gas flowing in the gas passage;
• an integrated cooler, wherein the gas passage extends to the integrated cooler;
• a gas valve provided on the gas passage between the oil pan and the integrated cooler, the gas valve configured to control a flow rate of exhaust gas flowing in the gas passage;
• and
• a controller the controller is configured to control an opening ratio of the gas valve based a temperature of the gas passage, the oil pan, or the integrated cooler.