Symptoms of a Bad or Failing Vent Oil Separator

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Cost of Replacing a Bad or Failing Vent Oil Separator

Common signs include smoke coming from the exhaust pipe, the Check Engine Light coming on, excessive oil consumption, and sludge under the oil cap. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Vent Oil Separator Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2009 Volkswagen Passat $219 $149.16 $70.00 14% $256.66
2004 Jeep Grand Cherokee $158 $4.28 $154.00 34% $240.78
2014 Subaru Forester $357 $202.56 $154.00 18% $439.06
2013 Mercedes-Benz SLK350 $185 $115.47 $70.00 16% $222.97
2013 BMW 328i $357 $90.80 $266.00 28% $499.30
2005 Porsche Boxster $260 $99.06 $161.00 24% $346.31
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How to Diagnose a Bad or Failing Vent Oil Separator?

vent oil separator

Oil is the lifeline of any combustion engine. It is designed to properly lubricate virtually every internal component inside of your car, truck, or SUV engine; and must do so consistently in order to reduce wear and tear on engine parts. During normal operation the oil inside your engine will mix with air, but needs to be reclaimed and redirected back to oil pan while the air is separated and directed to the combustion chamber. The process of completing this task is achieved by use of a vent oil separator in conjunction with other ventilation parts inside and surrounding the motor.

Regardless of whether your vehicle is powered by gasoline, diesel, CNG or hybrid power supply, the vehicle will contain some sort of oil ventilation system. Different cars and trucks have unique names for this part, but when they fail they develop similar symptoms of a bad or failing vent oil separator.

When the vent oil separator begins to wear out, or has failed completely, the damage done to internal engine parts can range from minor to complete engine failure; you'll recognize a few of these warning signs indicated below.

1. Smoke coming from the exhaust pipe

The vent oil separator is engineered to remove excess gases (air and other gases that are mixed within the oil) from the oil before it enters the combustion chamber. When this part is worn out or has expired, this process is not efficient. The introduction of extra gases into the combustion chamber makes it harder for the fuel/air mixture to burn clean. The result is that more engine smoke will be expelled through the car’s exhaust system. The excess engine smoke will be noticed primarily when the vehicle is at idle or at acceleration.

If you notice that there is white or light blue colored smoke coming from your tailpipe, you should contact a certified mechanic as soon as possible so they can diagnose and replace the vent oil separator. Failure to do so quickly can result in damage to cylinder walls, piston rings, and cylinder head components.

2. Check Engine Light is illuminated

As the oil and gases begin to burn, it typically increases temperature inside the combustion chamber. This can and often does trigger a warning inside your vehicle’s ECU and then sends the alert to the dashboard by lighting up the Check Engine Light. This warning creates a warning code that is downloaded by a professional mechanic through a diagnostic tool plugged into the vehicle’s computer. If you notice that the Check Engine Light is lit on you dashboard, it's recommended to head home as soon as possible and contact an ASE certified mechanic as soon as possible.

3. Excessive oil consumption

Another common symptom of a damaged or worn out vent oil separator is when the engine consumes more oil than it should. This problem is common with engines over 100,000 miles and is often assumed to be typical wear and tear of internal engine components. However, many professional mechanics agree that the root cause of the extra oil consumption is the vent oil separator is not doing what it was engineered to complete. If you notice that the Check Oil Light comes on, or when you check your engine oil it is often low and you need to add oil frequently, contact a professional mechanic to inspect your vehicle for a damaged vent oil separator.

4. Sludge under your oil cap

A bad or failing vent oil separator will also fail to remove condensation from oil. In many cases, the extra moisture will collect under your oil fill cap and mix with dirt and debris that is trapped inside the motor. This creates sludge or oil combined with dirt to appear under or surrounding the oil cap. If you notice this issue, contact a certified mechanic to inspect and diagnose the problem with your car.

In a perfect world, our engines will run forever. Believe it or not, if you stay on top of routine service and maintenance, there shouldn't be a problem with the vent oil separator. However, it's quite possible for this condition to occur even with proper service. If you notice any of the above warning signs of a bad or failing vent oil separator, don't delay – contact a certified mechanic as soon as possible.

ventilation
oil pressure
leaks

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Recent Vent Oil Separator Replacement reviews

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YourMechanic Vent Oil Separator Replacement Service

Average Rating

5/5

Number of Reviews

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Rating Summary
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Nazareth

24 years of experience
19 reviews
Nazareth
24 years of experience
Awesome mechanic I’m glad I found him. I have some repairs on my other car and will be using him again!
2010 VOLKSWAGEN CC - VENT OIL SEPERATOR - LOS ANGELES, CALIFORNIA

Vladimir

7 years of experience
214 reviews
Vladimir
7 years of experience
Good service, good cleanup when finished.
2006 PORSCHE BOXSTER - VENT OIL SEPERATOR - ROSEVILLE, CALIFORNIA

Patrick

30 years of experience
865 reviews
Patrick
30 years of experience
Another job well done! Came to my work and was in/out in no time. My car is running awesome.
2011 MERCEDES-BENZ C300 - VENT OIL SEPERATOR - AUSTIN, TEXAS

Rigoberto

8 years of experience
517 reviews
Rigoberto
8 years of experience
Rigo was great. He was friendly and professional and always took the time to answer all my questions.
2006 VOLKSWAGEN PASSAT - VENT OIL SEPERATOR - CHICAGO, ILLINOIS

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