Engine Oil Cooler Buying Guide
Paskutinį kartą atnaujinta: 2026 m. balandžio 24 d.
The engine oil cooler maintains optimal oil temperature by exchanging heat with coolant or air. Overheated oil loses viscosity and lubricating ability, while an oil cooler leak can contaminate the coolant system. At CarParts247 we stock oil coolers from Behr, Nissens, and NRF.
Oil cooler failure symptoms
Oil cooler failure typically manifests as internal leakage (oil mixing with coolant) or external leakage. The consequences of delayed repair can be severe.
- Milky or emulsified coolant in the expansion tank — oil contamination
- Coolant mixing into the oil — mayonnaise-like substance on the oil cap
- External oil or coolant leak from the cooler housing or gasket
- High oil temperature warning — blocked cooler passages
- Overheating — contaminated coolant loses its heat transfer ability
Replacement and system flushing
When an oil cooler fails internally, both the oil and coolant circuits are contaminated. Both systems must be thoroughly flushed before and after fitting the replacement.
- Flush the cooling system multiple times until the coolant runs clean
- Change the engine oil and filter — contaminated oil must be fully removed
- Replace the cooler gaskets and O-rings — they are the most common leak point
- Check the oil filter housing for cracks — it often incorporates the cooler mounting
- Run the engine to temperature and recheck both oil and coolant for cross-contamination
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Dažnai užduodami klausimai
What happens if oil mixes with coolant?
Oil in coolant reduces cooling efficiency and can damage water pump seals and heater matrices. Coolant in oil destroys the oil's lubricating properties, leading to rapid engine wear. Both fluids must be flushed.
How do I know if the oil cooler is leaking internally?
Check for milky coolant (oil in coolant) or a mayonnaise deposit under the oil cap (coolant in oil). Pressure testing the cooler off the vehicle confirms the fault.
Can I just replace the oil cooler gaskets?
If the leak is external from the gasket, yes. If the cooler is leaking internally (oil-to-coolant mixing), the cooler itself must be replaced.
Do all cars have an oil cooler?
Not all. Many smaller naturally aspirated engines rely on the sump and airflow for oil cooling. Turbocharged, diesel, and high-performance engines typically have a dedicated oil cooler.
Susiję gidai
No cold air, clutch not engaging, and seized compressors — A/C compressor types, oil charging requirements, and new vs remanufactured options.
Coolant Flange Buying GuideCoolant flanges, thermostat housings, and outlet pipes — plastic vs aluminium, common failure modes, and correct sealant for leak-free installation.
Coolant Temperature Sensor Buying GuideIncorrect temperature gauge, poor fuel economy, and cooling fan issues — diagnosing a faulty coolant temperature sensor and selecting a replacement.
Interkulerio pirkimo vadovasOro-oro ir oro-vandens interkueleriai — turbo slėgio nuotėkio diagnostika, šerdies pažeidimų požymiai ir patobulinimo galimybės.
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