How to Fix Milky Oil in an Engine in 15 Simple Steps

How to fix milky oil in an engine is something that every automobile owner and mechanic should learn. Emulsified oil, commonly referred to as milky oil, is a sign of a serious issue in the engine that, if not fixed right away, could result in serious engine damage.

How to Fix Milky Oil in an Engine

Because the contaminated oil cannot sufficiently lubricate the engine components, there will eventually be engine failure due to increasing wear and strain. In this article, we’ll outline a step-by-step procedure for fixing milky oil in an engine, including determining the source and swapping out the required components.

How to Fix Milky Oil in an Engine

To fix milky oil in an engine first, you have to assess the damage and identify the cause. After that, you need to drain the oil, flush the system, and do some follow-ups. Finally, you need to replace a few components, such as the oil filer.

1. Assess the Damage

It’s essential to figure out the extent of the harm when an engine has milky oil. A blown head gasket or a broken engine block are examples of major engine damage that could be indicated by milky oil. Low oil pressure, unusual noises, and diminished power are all warning signs of engine deterioration.

Assess the Damage

This should be done to establish the degree of the damage, which will help direct further repairs. Any problems that need to be fixed can be found with the help of a complete examination of the engine, which includes visual inspection and diagnostic testing.

2. Identify the Cause

Finding the cause of the milky engine oil is the next step after evaluating the damage. This step can be difficult since milky oil might have several different causes, such as a blown head gasket, a cracked engine block or cylinder head, a damaged oil cooler, or a broken water pump.

The secret is to properly examine the engine, looking for evidence of damage and any additional elements that might be causing the issue. After you’ve determined what is causing the oil to be milky, you can address the underlying problem. If you are unable to find the cause yourself, don’t hesitate to take help from a professional.

3. Drain the Oil

The next step is to remove the tainted oil from the engine after you’ve determined what is causing the oil to be milky. This is an important step since oil milky includes water and other pollutants that, if left in the engine, can lead to further harm. Remove the milky oil cap to drain the oil, then let it flow into an appropriate container.

Drain Car Engine Oil

Be careful about properly disposing of the used oil and abide by any municipal rules about oil disposal. It’s necessary to properly clean the oil pan and other components once the oil has been drained to get rid of any impurities that may still be there.

4. Flush the System

After draining the tainted oil, cleaning the engine oil system is vital to remove any leftover impurities. Flushing entails filling the engine with a specialized engine flush milky oil solution and running it for a brief amount of time to allow the solution to circulate and remove any leftover impurities.

After draining the solution, the engine is flushed with clean oil to remove any lingering traces of the flush solution. This is the most important step in eliminating any pollutants that may have created the milky oil. Failing to adequately cleanse the system might leave residual impurities in the engine, resulting in future engine damage.

5. Inspect the Cooling System

Milky oil can indicate a problem with the cooling system of the engine. Checking for leaks, corrosion, and appropriate coolant flow is part of inspecting the cooling system. Begin by visually evaluating the radiator for signs of damage or corrosion, as well as checking the coolant level and color.

Inspect Car Cooling System

Examine the hoses, water pump, and thermostat housing for any signs of coolant leaks. In addition, inspect the radiator cap and replace it if necessary. A defective cap might overheat the engine, resulting in milky oil. If the cooling system fails, engine damage can occur, and this problem may persist.

6. Check for Radiator Leaks

Engine oil pollution is frequently caused by radiator leaks. If the radiator is leaking, coolant can combine with the engine oil, causing a milky look. Start the engine and inspect the radiator and hoses for any visible symptoms of leaks to check for radiator leaks. Examine the radiator and hoses for damp patches or stains, as well as any signs of coolant dripping or pooling.

Another method for detecting leaks is to pressurize the cooling system and monitor any pressure drops if you find a leak, repair or replace the radiator or hose as needed to keep the motor oil from becoming contaminated again.

7. Check for Air Cooler Leaks

Certain engine systems employ air coolers to cool the air entering the engine. If the air cooler leaks, engine oil can mix with the coolant, causing the coolant to appear milky. Inspect the air cooler and its accompanying hoses for any visible signs of leaks to check for air cooler leaks.

Examine the cooler and hoses for damp spots or stains, as well as any signs of oil spilling or pooling. Repair or replace the air cooler or hose if a leak is discovered. It is critical to repair air cooler leaks as soon as possible to avoid further engine damage and to ensure optimum cooling system operation.

8. Replace the Head Gasket

The head gasket seals the combustion chamber, coolant passageways, and oil passages between the engine block and cylinder head. If the head gasket fails, coolant can leak into the engine’s combustion chamber and mix with the engine oil, resulting in a milky look.

Changing the head gasket is a difficult task that necessitates the removal of the cylinder head from the engine block. To achieve a perfect seal, follow the manufacturer’s directions and use the correct gasket for the engine.

9. Repair the Cylinder Head or Engine Block

If the engine was highly overheated or the head gasket failed frequently, the cylinder head or engine block could have been damaged. To ensure a suitable seal, some damage can be corrected by machining or resurfacing the cylinder head or engine block. If the damage is severe enough, the cylinder head or engine block may have to be replaced.

This is a major repair that should only be done by a qualified mechanic with the necessary tools and skills. Before selecting to repair or replace the cylinder head or engine block, it’s critical to have the engine thoroughly evaluated to verify the repair is effective and that the engine runs well.

10. Fix Engine Overheating

When an engine overheats, the engine oil and coolant combine, resulting in a milky appearance in the oil. To resolve engine overheating, first, check the coolant level and, if necessary, add coolant. Examine the radiator, hoses, water pump, and thermostat for noticeable damage or leaks. As needed, replace any damaged components.

Fix Engine Overheating Issue

It’s also critical to make sure the engine isn’t operating too lean or rich, as this might lead to overheating. A competent mechanic can run diagnostic tests to establish the root cause of engine overheating and offer remedies.

11. Fix Air Cooler Leaks

If the engine has an air cooler, check for leaks since this can also cause the engine oil and coolant to mix. The air cooler, which is normally situated near the radiator, is in charge of cooling the air that enters the engine. Look for any visible signs of damage or corrosion on the air cooler, such as cracks, holes, or rust, to check for leaks.

If a leak is discovered, a professional mechanic may be required to replace or repair the air cooler. It’s also a good idea to inspect the air cooler hoses for visible signs of damage or leakage and repair them as necessary.

12. Use a Block Sealer

If the engine has a cracked block or cylinder head, a block sealer may provide a temporary solution. A block sealer is a substance that can be mixed into engine coolant and used to seal minor cracks or leaks in the engine block or cylinder head. It works by passing through the engine and sealing the afflicted area.

However, it should be noted that a block sealer is not a permanent solution and should only be used as a stopgap until the engine can be properly fixed or replaced. Also, while using a block sealer, it is critical to follow the manufacturer’s directions and to use a product that is suitable for the engine and coolant system.

13. Replace the Oil and Filter

After the engine has been repaired and the source of the milky oil has been identified, the oil and oil filter must be replaced. This will remove any lingering impurities or water from the engine and ensure that it runs on clean oil. Check the manufacturer’s suggested oil type and viscosity for the engine before adding new oil.

It is also advised to use high-quality oil and filters to maintain optimal engine performance and longevity. After pouring new oil, run the engine for a few minutes before checking the oil level and condition to verify there are no problems or leaks.

14. Test the Engine

Following the replacement of the oil and filter, it is critical to test the engine to check that it is operating smoothly and that there are no problems or leaks. Start the engine and run it for a few minutes while keeping an eye on the oil pressure and temperature.

If the engine runs smoothly and without odd noises, and the oil pressure and temperature are within standard limits, the engine is most likely repaired. It’s also a good idea to take the vehicle for a brief drive to confirm that the engine is working properly.

15. Preventative Measures

Once the engine has been repaired, it is critical to take precautionary measures to avoid future milky oil. Frequent cooling system maintenance, such as draining and refilling coolant, can help prevent leaks and engine damage. Furthermore, regular oil changes can aid in the prevention of sludge development.

Watching the engine temperature gauge and fixing any concerns as soon as they arise can also help to prevent overheating and engine damage. Finally, keep an eye on the condition of the vehicle’s gaskets and seals, as worn or damaged gaskets can cause oil leaks and engine oil pollution.

Can Milky Oil in an Engine Affect the BMW Transmission?

Can milky oil in an engine affect the BMW transmission? Not directly. However, if the milky oil is a result of a blown head gasket or a cracked engine block, it can cause overheating, leading to transmission damage. The easiest way to reset BMW transmission is by using a diagnostic tool or bringing it to a professional mechanic.


You may quickly and effectively diagnose and address the issue using the knowledge learned from this article on how to fix milky oil in an engine, resulting in a more secure and dependable driving experience. However, here is a summary of this article that will help you overcome this challenge efficiently:

  • For successful repair, a detailed examination of the problem and identification of the fundamental cause is required.
  • To resolve the issue, steps such as draining the oil, flushing milky oil from the system, examining the cooling system, and so on are required.
  • To ensure a full repair, additional measures such as using a block sealer, refilling the oil and filter, and testing the engine are required.
  • Preventive actions such as regular maintenance and temperature monitoring of the engine can help prevent the occurrence of milky oil in the future.

We hope now you will be able to fix your engine if there is milky oil and it won’t be too difficult for you.

5/5 - (16 votes)
Ran When Parked