Oil Coming Out of Exhaust And 5 Ways to Troubleshoot

Fuel system issues comprise of nearly 70,000 common car problems reported to U.S. Department of Transportation for cars manufactured from 1996 to 2019, making it the 7th most common car problem area. One day you might find yourself confused finding oil coming out of exhaust pipe. Fearing this is a big deal, you jump right at checking your car’s exhaust pipe and find nothing. So what is really the problem? 

Don’t panic. The issue is actually quite common for used cars, and there are ways to troubleshoot this issue of oil leak in an exhaust pipe, even easily fix it at home without professional examination. In fact, oil leakage from exhaust pipes poses possible problems somewhere else. Follow these 5 clearly explained steps to detect how oil can get into the exhaust system. 

How to Troubleshoot the Problem of Oil Coming Out of Exhaust

Don’t panic when you found oil coming out of exhaustThere are several ways to diagnose this problem and reach for a solution. And in this article, we will even give you 5 solutions! Let’s discuss some common ways to pinpoint the troubling component.

Examine The End of Exhaust Pipe

Oil Leaking From Exhaust
Black soot can form an oil-like liquid. (photo source: Shutterstock)

Sometimes, the leaked oil coming from exhaust might not be oil at all! The exhaust pipe can usually the main source of this problem. If you are a lazy car owner and haven’t cleaned it for years, beside from our maintenance tips, we suggest checking the outside of the pipe. Since it usually collects soot and the layer could be pretty thick. Mixed with that soot, the condensation coming out of the car exhaust could form an oil-like liquid.

But worry not, driver can fix this issue very easy. All you need to do is wearing a glove and running a finger on the inside of the pipe to see if there’s soot.

Congested PVC Valve

oil coming out of exhaust
Driver should also notice the PVC Valve (photo source: porkercon/Youtube)

As we all know, internal engine gases travel to the combustion chambers through the PVC valve. When it’s clogged, the growing amount of gas volume creates pressure on the engine. This will forces the oil to pass several seals and into the exhaust pipe.

The warning signs for this kind of oil coming out of exhaust problem are bluish smoke and oil-smeared spark plugs. In order to fix this, car owners can replace the valve. This is an easy solution to address the problem.

Ruptured Head Gaskets

oil coming out of exhaust
Head gasket can also take responsibility for the oil coming out of exhaust

Being a part of the exhaust system, these act as a seal between the engine heads and the block. A blown gasket lets one or more fluids to get past the seals and mixed into the exhaust stream. So if you find oil coming out of exhaust, this could be a place to take a look.

The symptoms are the overheated engine, reduced engine performance, and excessive fuel burning. You have to change the defective gasket(s) to bring the system back to normal.

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Worn Valve Guides

oil coming out of exhaust
The oil coming out of exhaust could be from exhausted gas (photo source: Youtube)

Valve guides control the gas flows into and out of the engine. They have seals around their shafts that may wear out with time. In the case, the engine oil leaks and runs into the exhaust gases. You will detect bluish smoke coming out of the tailpipe if this problem occurs.

Watch Out The Smoke Colors

The colors of the tailpipe smoke are good signs to detect the type of oil coming out of exhaust problem.

Black smoke refers to unburnt fuel, which means that the engine fails to burn one or two combustion catalyst. Gray or bluish smoke means the leaking of engine oil into the internal combustion chamber.

On the other hand, white smoke requires a thorough examination of the engine. The problem could lie in the combustion chamber or because of faulty piston oil rings.

oil coming out of exhaust
Oil coming out of exhaust can also be noticed by the color of smoke (photo source: Legoheads/Youtube)

Oil coming out of exhaust pipe is a fairly common issue for cars with a long usage history. As a vehicle’s mileage increases, more worn parts can be found, thus frequent maintenance or checking is vital to ensure safe and hassle-free driving. This is also a factor worthy of consideration when deciding to buy used cars. 

Are you ready to take care of your baby more seriously and enjoy his well-running state while saving time and money going to local mechanic shops?

Not an expert on machineries? Worry not! Check out our comprehensive guide on car maintenance with easy to understand step-by-step instructions and illustrative images to become familiar with your vehicles, inside and out, and gain confidence in taking good care of them at your own home.