Oil Smells Like Gas [Causes & How to Fix]

Do not ignore the smell of gas in your engine oil. It is not what it should smell like. It is likely that your motor oil has become contaminated with gasoline, which can cause severe damage to your engine oil.  

To ensure optimal lubrication, oil is extracted from the sump through pipelines. The fuel tank stores gas, which is then transported to combustion chambers to be burned to power the vehicle. 

Combining the two can lead to a dangerous combination that could affect your vehicle’s performance. You may experience an oil-gas combination if you travel less frequently or your engine components become damaged. 

This article will examine possible causes why your car’s oil smells like gas.  

Why does my oil smell like gasoline? 

The engine oil could smell like gasoline because it was mixed with the fuel. To determine if there are any gasoline impurities in your oil, you can check its viscosity. Use your fingertips to rub some oil between your fingers. Oil that appears thin or light is likely to be contaminated with fuel. A gas-oil mixture can also be identified by: white smoke coming from your engine after driving. 

Side effects of the Oil-Gas combination:

  1. Reduced performance and lubrication  
  2. This can make it difficult to hear.  
  3. Wear and tear in different parts of the engine. 
  4. Oil viscosity can be reduced by a gas-oil combination, which makes it less suitable for hot temperatures. 

Why your oil smells like gas? 

You should consider several factors if your oil tank smells like gasoline. Although both oil and gasoline are essential fluids for your vehicle, mixing them can reduce their effectiveness. 

Accidentally adding gasoline to your oil tank can be one of the most strange situations. You should drain the oil through the drain filter, and then replace the oil with new engine oil.

Let’s take a look at the most common causes for oil-gas mixtures.

Frequent Short Distance Travel 

It is intended that the engine will run longer distances when it starts. The engine will adjust its odometer to match performance requirements. After the engine has been cooled, the fuel and oil will likely mix. This makes it more likely that you will detect gas from your crankcase. 

Only when the crankcase has been heated can any fuel remaining in it be evaporated. Long distance driving is a good way to heat crankcases. Gas dilution can occur when oil is used for short distances more often. The engine’s optimal temperature and viscosity cannot be reached by driving a short distance. Heating up oil can also provide better lubrication to the engine. 

Every once in a while, make it a point of driving for a long time. You should not drive that far if you are unable to. Make sure your engine is warm before you start the trip. If you drive a lot, make sure to change your oil every now and again. 

Damaged PCV Valve

The PCV valve (Positive crankcase ventilation) is responsible for returning excess fuel to combustion chamber, rather than storing it inside the crankcase. They also introduce filtered air to the gas in order to maintain the air-fuel mix. 


Sludge can build up in the valve’s PCV valve, causing it to fail. This can lead to an oil-gas combination, as there is no obstruction for gas to reach oil tank. Blot gaskets can also be caused by increased pressure in the crankcase. 

Because it is the most crucial part of separating the oil and the gas, I recommend that you replace your PCV valve.  The PCV Valve is located close to the intake manifold and the engine oil cap. The PCV valve is located near the intake manifold or engine oil cap. Every year, you must replace your PCV Valve. 20,000 to 50,000 miles.

Wear-Tear in Piston Rings 


Gas dilution can occur in your engine oil due to internal component wear. Piston rings stop oil entering the combustion chamber. It also prevents fuel being stored in your crankcase. Due to engine wear and tear, piston rings can be damaged. The crankcase’s oil and fuel mixture can get clogged up, which can cause your oil to smell like gasoline. 

You can change your engine oil frequently and use an oil filter. This will prevent the piston rings from getting worn. 

Sensor failure

Defective oil regulation sensors (such as the O2, MAF or MAP sensors) could lead to fuel richness. MAF sensors O2 sensors measure the volume of exhaust gases, while O2 sensors measure airflow to the intake system. These sensors measure the gas-fuel ratio and report it to the electronic control unit.

Rich fuel means that the fuel-to–air ratio is high. While the ideal ratio for gas to air is 15:1, faulty oil sensors could cause it to be inaccurate. Oil that smells like gasoline can be caused by rich fuel. It may make it burn incorrectly, and could even cause it to smell like gas. contaminate your oil

Engine Misfire

Engine misfire is when your vehicle stops or does not start in the middle of a driving session. The engine may misfire, which means that fuel can be stored in the crankcase. Some fuel ends up mixed with oil via the piston rings because it isn’t fully burned. This can be due to malfunctioning spark plug wires or ignition coils.  

Some Methods For Avoiding Engine Misfire: 

  • Use of premium motor oil. 
  • To generate heat and clean your car, start it a few moments before you drive. spark plug threads off any oil
  • Regularly service your vehicle. 

Faulty Injectors 

The fuel injectors provide the correct mixture of air and gasoline to the combustion engine. A solenoid controlling the computer in your car operates them. It can malfunction due to carbon buildup around it. Damaged fuel injectors can result in excess fuel being stored in the crankcase. You may notice a gas-like odor if there is too much gas in the crankcase. 

High-quality engine oil can be used to prevent your fuel injectors from deteriorating. To prevent fuel injector corrosion, make sure to change your engine oil every day. 


To sum it all, if your engine oil smells suspiciously like gasoline, you should investigate the problem and not ignore it. Contact your mechanic immediately if an internal component has been damaged. It is a good idea to take your car for a long ride, as this will help remove any impurities.  

You can drain your oil and replace it with high-quality oil. Use high-quality oil that is not expensive. oil filter brands They can also mix oil with other liquids to save money. You should have your car inspected for any gas-odor issues. 

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