Black Liquid Coming Out Of Exhaust Pipe – When To Be Concerned

Black Liquid Coming Out Of Exhaust Pipe – When To Be Concerned

Have you ever noticed a black liquid coming from the exhaust pipe? Don’t panic!

It’s a common scenario for many used cars to have oil coming from the exhaust pipe. There are many ways to spot and solve this oil leak from your car exhaust pipe.

Black liquid coming out of exhaust pipe

At some point, if not a serious cause, you can fix this problem at home. There is no need to visit a mechanic unless you don’t have any basics about your car.

How To Handle The Problem And The Remedies To Use

Oil leaks from your car are sneaky. A black liquid from the exhaust pipe indicates your car has a problem.

The leaking can be as a result of the following:

  • Serious failures and wearing of internal engine parts like valve guides
  • Worn or broken piston rings
  • Damaged head gaskets

Take your car to a mechanic for a checkup.

Here you will get the common causes of this problem. You will also get tips on how you will deal with this problem.

Examine The Exhaust Pipe End

Stress shouldn’t strike you when you spot a black liquid coming from your car exhaust. At times it’s a simple problem that you can tackle while at home.

A car needs proper and continuous maintenance to keep it fit for use. If you fail to wash your vehicle for some time, this problem will surface.

The same applies when you often fail to observe the pipe to remove dirt. An exhaust pipe releases smoke from the engine.

It collects soot on the sides of the pipe, and the collected layer can be too thick to hold on to the pipe.

Your car will start removing condensation from the pipe in an oil form mixed with soot.

If this is the case, you don’t have to worry about getting a professional to square out the problem.

Wear some suitable protective gloves and use your finger to remove the soot. You will be able to remove the soot layer on the exhaust pipe sides.

Depending on the amount of soot and the depth, you can use an old cloth wrapped on a stick to remove it.

It will help if your finger can’t get to the inner sides of the pipe having the soot layer.

Congested PVC Valve

The PVC car valve allows the travel of gases to the combustion chambers.

Once the PVC valve gets clogged, the gas volume increases inside to exert pressure on your engine. The oil will now pass some seals into the car exhaust pipe.

You will see the engine spark plugs smeared with oil and bluish smoke. To solve this problem, you need to replace the PVC valve.

Raptured Or Damaged Head Gaskets

Head gaskets are part of your car exhaust system. The head gasket might have a problem when you spot a black liquid coming from your car exhaust pipe.

Engine head gaskets play the role of a seal that links between the block and engine heads. Blown gaskets will allow fluids, if not one, to go past the engine seals.

The fluids then mix in the car exhaust channel as they come out via the pipe.

If you spot the oil coming from the exhaust, this is among the regions that you should visit and check.

The indicators that will drive you to this part for checking are:

  • Reduced performance of the engine
  • Extreme fuel burning
  • Engine overheating

To bring the engine to life as before, you need to replace all defective gaskets. You won’t see the problem again.

Black liquid coming out of exhaust pipe causes

Worn Out Valve Guides

The vehicle valve guides control gas flows out and into the engine. Engine valve guides have seals at the shafts.

If these seals wear out, you will see a black liquid coming from the vehicle’s exhaust pipe. In this scenario, oil leaks run into the engine exhaust.

The oil mixes with the gases there as they come out. When valve guides wear out, lubrication from engine oil goes beyond the seals.

It happens around the engine shafts.

To know that the valve guides have a problem, you will see bluish smoke from your tailpipe as you drive. What you need to do is to change the seals on the valve guides.

It will prevent oil leaks from the engine into the exhaust gases.

Car Smoke Colors

To tell the exact type of black liquid exiting the exhaust pipe, check the smoke color at the tailpipe.

It will tell you the exact problem with your car when you see a black liquid coming out of the exhaust pipe. It’s an excellent move to take before damaging your car.

Black smoke comes from unburnt fuel. It shows that your car engine doesn’t burn either one or more combustion catalysts.

Gray or blue-like smoke indicates oil leakage into the interior combustion chambers.

The white smoke implies that your car engine needs an in-depth checkup. The problem can be the combustion chambers or damaged oil rings of the piston.

A visit to a trusted garage or professional mechanic is the best step.

How To Resolve A Black Liquid Coming Out From Your Exhaust

When you spot a black liquid coming from your tailpipe, here are the tips you need to use to fix this issue.

Use The Oil Additives

The common problem with your engine seals, like the O rings and the gaskets, is leaking.

These seals’ heat, mileage, pressure, or age makes them shrink, dry up, and harden. It creates gaps between the seals that allow oil to get out.

The stop leaks additives have a design that reduces the amount of oil that seeps out via those spaces. The seals absorb the oil additives, making them expand.

They regain their original size, flexibility, and shape. Seals now stop the leakage completely.

Replace The Damaged Engine Rings

Damaged pistons cause a cloud of black smoke to come out of your exhaust when you accelerate.

The smoke will lead to soot buildup in the exhaust pipe that will come out a condensation of black liquid.

Give your car regular service that will enable you to spot damaged rings that you will replace in good time.

After a long drive, you also need to give your car time to rest to save your engine rings.

Replace The Worn-Out Valve Guides

Engine valve guides control the flow of gases out and into your engine. The valve guides have seals on the shafts that wear with time to cause oil leakages.

If the valve guides get worn out, replacing them will solve this problem.

Replace Congested PVC Valve

When the PVC valve congests, the pressure inside the engine increases. It forces the oil to leak via the seals into the tailpipe.

To solve this issue is to check the PVC valve and, if congested, replace it.


You shouldn’t worry much if you see any oil spillage or a black liquid coming out of the exhaust pipe. The above problems are the leading causes of this problem.

The suggested remedies are perfect for each category. If you cannot handle the above remedies, you need a professional to get it done on your behalf.