Causes of Radiator Fluid Mixing with Engine Oil

Causes of Radiator Fluid Mixing with Engine Oil – The internal combustion engine is still very important for today’s modern vehicles. Although widely replaced ICE engines with battery technology, hybrid cars also still use ICE engines. Therefore, the problem of radiator fluid mixed with engine oil will still be an important issue for the next few decades.

Read more: 5 Common Signs of Bad Radiator Cap

Causes of Radiator Fluid Mixing with Engine Oil

Some vehicle owners complain that the radiator fluid is dirty and colored like mud, this usually occurs because there is a leak in the engine oil and then the oil enters the engine cooling system. The effect of this condition is that the radiator fluid will become cloudy, milky in color, and even muddy. To fix the problem, of course, we need analysis to find the source of the problem and then we need to make improvements. There are several causes of radiator fluid mixed with engine oil, here are some of the causes.

Radiator Fluid Mixing with Engine Oil

1. Oil cooler has a leak

Some cars have an oil cooler that aims to cool the engine oil temperature. In the oil cooler component, engine oil is cooled by a thin lattice that is fed by radiator water. So it is very vulnerable if a leak occurs causing engine oil to flow into the radiator fluid. To fix this problem, we can replace the oil cooler component with a new one.

2. Oil cooler housing and seals are damaged

The oil cooler has several rubber seals. In some cases, the oil is mixed due to the problem of damage to the seal. However, some other cases are also due to damage to the housing seal. Both rubber seal and housing seal problems usually occur because the seal is old so water or engine oil can seep and mix. For handling, that is by replacing the seal or housing at once depending on the damage that occurs.

3. Waterpump and waterpump seal leak

In some types of cars, the position of the water pump is very close to the engine oil. So if there is oil seepage it will go directly into the engine cooling system. For repairs, we can replace the water pump or the problem depends on the damage that occurs. Although some people replace the water pump seal with a new one, I do not recommend this. Replacing the water pump seal does give good results. But for durability, this will only last up to the range of 6 months. So, please replace the water pump with a new set.

Read more: 5 Symptoms of a Bad Water Pump and How to Fix It

4. Packing head is damaged

In some cases, the radiator water mixed with engine oil due to a damaged cylinder head packing. So that the oil can cross into the water jacket or engine cooling system. In the case of cylinder head gasket damage, the effects that occur can vary depending on the position of the damage and the construction of the machine. The effect of the damage could be that water enters the cylinder, or compression enters the cooling system. Handling it can be done by replacing the cylinder head gasket. This is a big job, so be careful when making these repairs.

5. Porosity on the head or engine block

Corrosion of engine parts can cause radiator water to mix with engine oil. We often find the porous on the cylinder head and upper engine block. For repairs, we can do this by welding on the parts that are porous or corroded. However, sometimes the results of the welding are not optimal and cause repeated damage. So the best advice if corrosion occurs on the engine is to replace it. Although the cost will be much more expensive the results will be much more durable than just doing welding.

Read more: Overheat Engine due to bad cylinder block; Honda City VTEC 2006

In addition to the components that I have mentioned above, there are many other components that have the potential to cause engine oil to enter the radiator water. This is because each machine has a different structure so the causes and effects can also be different. However, the concept of analysis is the same, namely looking for components that have the engine oil and radiator water lines that are close to each other.

For those of you who have experience in this kind of case, please share in the following comments column. This will add insight and knowledge for other friends who have similar problems.

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