What Causes Engine Oil in the Radiator?

1 Answers
LaSavannah
07/29/25 7:39pm
Possible reasons for engine oil in the radiator include: 1. Cylinder liner damage. If cracks appear in the cylinder liner, under high pressure, engine oil can seep through these gaps directly into the car's radiator. 2. Radiator damage. The engine oil cooler or transmission cooler may be damaged. 3. Cylinder head gasket damage. If there is engine oil in the radiator and the high-temperature warning light is on, it indicates a damaged cylinder head gasket. Solutions for engine oil in the radiator: 1. Disconnect the overflow tank and turn off the heater. 2. Start the vehicle and let it idle until the water temperature rises. Then, flush the radiator opening with water until no significant oil traces remain before stopping. 3. Turn off the engine, open the radiator drain valve, and once water starts flowing out, start the engine again. Continue adding water to the radiator opening to allow circulation. After 5 minutes, turn off the engine and stop adding water. Wait until all water has drained from the radiator, then close the drain valve and refill with water. 4. Start the vehicle without covering the radiator cap. After it heats up, check the radiator opening for any oil traces. If none are present, the method is effective. 5. Reconnect the overflow tank and replace the coolant as needed.
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