Oil Coming Out of Exhaust – Causes and Solution

If you ever notice oil coming out of your car’s exhaust can be a concerning sight for your car engine health.

This issue, though not uncommon, can indicate serious underlying problems with your engine.

Understanding the causes and finding appropriate solutions can help you address the issue promptly, ensuring the longevity and performance of your vehicle.

Causes of Oil Coming Out of Exhaust

Here are the possible causes:

1. Worn Piston Rings

The piston rings in an engine create a seal between the cylinder wall and the piston. If these rings wear out, they can allow oil to leak into the combustion chamber and subsequently out of the exhaust.

2. Leaking Head Gasket

A blown head gasket can allow oil to mix with the engine’s coolant, and this mixture can find its way into the combustion chamber, resulting in oil coming out of the exhaust.

3. Faulty Valve Seals

If the valve seals are damaged or worn, they may allow oil to leak into the combustion chamber. This oil can then burn during the combustion process and exit through the exhaust.

4. Cracked Cylinder Block

Over time, the cylinder block or walls can become cracked or damaged, leading to increased oil consumption and oil passing into the combustion chamber.

5. Bad PCV Valve

A PCV valve is responsible for maintaining air pressure within the engine crankcase and emission control to prevent harmful gases. If the PCV valve becomes faulty, then it can cause a buildup of pressure in the crankcase, leading to oil leaks into the combustion chamber.

6. Excessive Engine Oil

Overfilling the engine with oil can lead to excessive pressure within the engine, causing oil to be pushed into the combustion chamber and then out of the exhaust.


  1. Engine Overhaul: In cases where the issue is caused by worn piston rings or cylinder walls, an engine overhaul might be necessary. This process involves replacing the worn-out components and ensuring the engine is reassembled correctly.
  2. Valve Seal Replacement: If the issue is caused by malfunctioning valve seals, replacing the seals can prevent oil from leaking into the combustion chamber.
  3. PCV Valve Replacement: If the problem is traced back to a malfunctioning PCV valve, replacing the valve can help regulate the pressure within the crankcase and prevent oil from entering the combustion chamber.
  4. Regular Maintenance: Regularly checking the engine oil level and ensuring it is not overfilled can prevent oil from being forced into the combustion chamber.

Ready to Stop the Oil Leak? 🚗

Don’t let oil coming out of your exhaust be a source of worry.

Take action today!

Contact our trusted mechanic at Automovill for a professional inspection and get your vehicle back on the road without oil-related headaches.

Your car deserves the best care, and so do you.

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