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How does the engine oil cooler work?

The engine oil cooler is a crucial component in modern vehicles that helps regulate the temperature of the engine oil, ensuring optimal performance and longevity of the engine. This article will provide a detailed explanation of how the engine oil cooler works, using a journalistic style and proper HTML formatting.


The Purpose of the Engine Oil Cooler


The primary function of the engine oil cooler is to dissipate excess heat from the engine oil, which can build up during prolonged periods of high-load operation or in hot climates. Excessive heat in the engine oil can lead to a breakdown of the oil's lubricating properties, increased wear on engine components, and even engine failure. The engine oil cooler helps maintain the oil's temperature within the optimal range, typically between 195°F and 230°F (91°C and 110°C), to ensure efficient lubrication and cooling of the engine.


How the Engine Oil Cooler Works


The engine oil cooler is typically located in the engine's cooling system, either in the oil pan or in the oil line between the oil pump and the engine. The cooler consists of a series of small tubes or plates that allow the engine oil to flow through, while a separate coolant fluid (usually the same coolant used in the engine's radiator) flows around the outside of the tubes or plates. This design allows for efficient heat transfer from the hot engine oil to the cooler coolant fluid, effectively lowering the oil's temperature.


The process works as follows:



  • Hot engine oil flows into the oil cooler, where it passes through the small tubes or plates.

  • Coolant fluid, which is typically circulated by a separate coolant pump, flows around the outside of the oil cooler's tubes or plates.

  • The heat from the hot engine oil is transferred to the cooler coolant fluid, effectively lowering the oil's temperature.

  • The cooled engine oil then flows back to the engine, where it continues to lubricate and cool the engine components.

  • The heated coolant fluid is then circulated back to the engine's radiator, where it dissipates the heat to the surrounding air, completing the cooling cycle.


By continuously circulating the engine oil through the cooler, the engine oil cooler helps maintain the oil's temperature within the optimal range, ensuring efficient lubrication and cooling of the engine.


Benefits of the Engine Oil Cooler


The engine oil cooler provides several key benefits to the overall performance and longevity of the engine:



  • Improved Engine Efficiency: By maintaining the engine oil's temperature within the optimal range, the oil can more effectively lubricate the engine components, reducing friction and wear, and improving overall engine efficiency.

  • Increased Engine Lifespan: Preventing excessive heat buildup in the engine oil helps to extend the oil's useful life, as well as the lifespan of the engine components themselves, reducing the need for costly repairs or replacements.

  • Enhanced Towing and Hauling Capabilities: In vehicles used for towing or hauling heavy loads, the engine oil cooler helps to prevent the oil from overheating, which can occur during prolonged periods of high-load operation.

  • Better Fuel Economy: By improving engine efficiency and reducing wear, the engine oil cooler can contribute to improved fuel economy, saving the vehicle owner money on fuel costs over time.


Overall, the engine oil cooler is a critical component in modern vehicles, helping to maintain optimal engine oil temperature and ensuring the long-term health and performance of the engine.

What are the disadvantages of oil coolers?


Downsides of Engine Oil Coolers
When an oil cooler malfunctions, it has the capacity to force all the coolant out of the engine, increasing the risk of an overheated engine. This may lead to possible damage to the engine.



How much does it cost to replace an engine oil cooler?


The average cost for an Engine Oil Cooler Replacement is between $576 and $634. Labor costs are estimated between $162 and $204 while parts are priced between $414 and $430. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.



What causes an oil cooler to go bad?


An engine oil cooler should last for years with minimal problems. Some of the most common problems are cracks and leaks in the cooler. Rust often causes leaks, but road vibrations can also contribute to this problem, especially if you drive off-road. Generally, this problem is more likely to occur in an older vehicle.



How do I know if my oil cooler or head gasket is bad?


Cylinders. We have a compression. Test just pop out all the spot plugs. And the fuel pump fuse then grab the compression tester gently thread it into cylinder 1 and crack the engine over 6 to 8.



Can you drive with a faulty oil cooler?


Although the absence of an oil cooler would be a worst-case scenario, the next worst thing would be driving with a failing oil cooler. In the interests of safety, it's critical that you know the signs of an oil cooler that's on the way out so you can attend to the problem as soon as possible.



Can you drive without an oil cooler?


Bypassing an engine oil cooler is technically possible, but it's generally not recommended for several reasons: Increased Engine Temperature: The oil cooler helps to regulate the temperature of the engine oil. Without it, the oil may overheat, leading to decreased lubrication effectiveness and potential engine damage.



How effective are engine oil coolers?


Oil coolers can help maintain optimal performance and protect the engine from wear and tear. Heavy-duty trucks: Trucks designed for industrial or commercial usage face prolonged heavy workloads. Oil coolers help these engines withstand consistent strain without overheating.



How does oil flow through an oil cooler?


As oil temperature rises to approximately 180˚ F, the valve closes and forces the oil to pass through the oil cooler. The oil then returns to the accessory housing where it is routed through the oil filter adapter, the filter and then again through the filter adapter, accessory housing and finally into the crankcase.



What happens if the oil cooler is not working?


If the cooler fails to regulate the oil temperature effectively, it can result in elevated oil temperatures that compromise the oil's ability to lubricate and protect the engine components. This can lead to increased friction and accelerated wear on critical parts, reducing the engine's overall lifespan.



How do I know if my engine oil cooler is bad?


If there is a problem with the oil cooler, it may trigger warning lights on the dashboard. These lights can include the “Check Engine light“, the oil pressure warning light, or the engine temperature warning light.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.