Why is there engine oil in the car's radiator?

1 Answers
GideonMarie
07/29/25 5:06pm
Reasons for engine oil in the car's radiator: 1. Cylinder head gasket failure. 2. Transmission cooler malfunction. 3. High engine temperature. 4. Damaged cylinder head gasket connecting oil and coolant passages, allowing higher-pressure engine oil to enter the coolant system and reach the radiator. 5. Cracked cylinder liner - under high combustion pressure, engine oil and diesel fuel can be forced through cracks into the coolant. 6. Oil cooler failure - manufacturing defects like cracks, poor welding, or winter freeze damage from undrained coolant can allow oil to mix with coolant.
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