You receive low oil warnings more frequently than usual, indicating that your engine is losing too much oil. Oil leaks may be one of the reasons your engine is losing oil.  

If there are no oil patches in the parking lot, no signs of wear and tear in the engine components, or any black smoke coming out of the exhaust, this could indicate that external oil leakage is not the cause of oil loose in your engine. 

Let’s look at some other causes of car oil loss. 

Why is My Car Losing Oil? 

Dirty oil 

This is a rare occurrence, but you may lose oil if your engine oil is too old or because of a clogged oil filter; your oil may become contaminated with outside dirt and impurities. Old oil can quickly cause sludge buildup inside engine components, slowing the oil flow. 

This can result in less oil flowing through the engine components, due to which you might see the too-low oil level. As quickly as feasible, flush out old engine oil and refill it with new oil 

Internal oil leakage 

The other major reason your engine loses oil could be leaking into the engine components and being burned.

There are two types of leaks in your engine: internal and external. You can observe oil patches under your parked car if your engine has an exterior leak. However, if the leak is internal, it is difficult to identify. Internal oil leak occurs when worn or damaged engine components enable oil to enter the combustion chamber. 

If a lot of oil leaks internally in your engine, you may notice some black smoke coming out of your engine exhaust. However, if a tiny amount of oil is burned daily, there will be no visible indicators such as oil patches or smoke, but your engine will lose a significant amount of oil.  

Causes of Oil Burning Internally

Damaged PCV Valve 

The PCV valve’s job is to channel air and fuel back into the combustion chamber from the intake manifold. It avoids escaping from air and fuel. Temperature and pressure extremes can cause the PCV valve to swell and crack. 

If your PCV valve is damaged, oil might be sucked via the air intake. This oil can then reach the combustion chamber via the intake manifold(not inside the manifold)and be burned. 

This oil combustion in the combustion chamber can result in poor fuel economy, engine misfire, and sludge accumulation. 

Damaged Piston rings

Piston rings seal the combustion chamber, preventing air and fuel from escaping the engine. Piston rings are also in charge of transferring heat from the hot piston to the cylinder walls. 

When the piston rings wear down, the seal between the piston and the cylinder wall becomes easily compromised. Oil can readily flow into the combustion chamber due to the cracked seal, causing your oil to burn or smell like gas

Broken Camshaft Seal  

The camshaft is responsible for fuel input and gas output in the internal combustion chamber. They also use pointed cams to control the motion of the crankshaft. 

If the camshaft seals on the cylinder walls are broken, the oil may flow into the combustion chamber. This can lead to the consumption of more oil in your engine than usual. 

Faulty Head Gasket  

The head gasket is directly accountable for stopping any liquid that enters the combustion chamber. A blown head gasket can cause oil to flow into the combustion chamber. 

If the head gasket is cracked, it should be replaced as soon as possible since it might cause oil to burn inside the combustion chamber or even affect your spark plugs. You should contact a mechanic to repair your head gasket because it is difficult. 

Damaged Cylinder Walls 

If the piston rings are not damaged, the cylinder walls may be faulty. The cylinder walls act as a barrier, preventing fumes from entering the crankcase and allowing the piston to perform fully.  

Excess carbon accumulation on the cylinder walls could result in excess pressure. If the cylinder walls are broken, the piston rings may scrape against them, increasing the oil pressure and allowing oil to flow into the combustion chamber. 

What to do when a car loses oil but with no leaks or smoke? 

If your dashboard displays a low oil warning, turn off your engine. If the oil light is blinking, that’s a different issue you need to address.

You should be aware of how many miles your oil typically lasts. Manufacturers usually recommend changing the oil every 6000-10000 miles or twice a year. If you’re running after the due date of changing the oil, there might be chances that oil is just evaporating from usage in your engine.

If your oil runs out before then, it could be due to internal or external leaks. 

Check for any signs of leakage; if there are no signs of outward leaking, it is conceivable that your engine is internally burning oil. Broken engine components usually cause excess oil loss. 

Be careful to thoroughly inspect your vehicle to determine the true reason for the oil leak. Repairing an interior oil leak can cost between $200 and $500. If the engine component has sustained significant damage, you may need to replace it. But if the part is new or is less damaged, oil seals can fix your problem.  

An oil seal is utilized to repair any leak in your engine caused by wear and tear on engine components. Oil seals are made of synthetic polymer with leak-prevention additives. These oil seals can fill up small scratches and wear marks causing oil to flow into the engine. Make sure to ask your mechanic to apply the oil seals, as doing so saves money. 


To summarize, if your car is losing oil without showing signs of leaking, it may be burning oil internally inside the combustion chamber. Get your PCV valve, head gasket, camshaft, and other components repaired to avoid internal oil leaks. 

You should also replace your oil after a few miles, as outdated oil might cause oil starvation in your engine. Consult your mechanic to determine the true cause of the problem and have it repaired. 

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