How often should you clean intake manifold to remove carbon sludge?

Recent event of BMW in relationship with EGR causing fire posed a lot of questions to all diesel car owners. Especially those of who drove more than 5 years or so living in Seoul where you have to make a frequent stop(this is considered as the best condition to create carbon waste as opposed to less congested area.)




Normally not many people are aware of the need for cleaning carbon sludge buildup in intake manifold area. Or some people believe this has to do with performance upgrade, so they don’t take it as the necessity. This may be true with low performance gasoline car in general, but with high performance gasoline as well as all turbo diesel cars need to clean carbon sludge in the intake manifold regularly. If you don’t do this, this will degrade car’s overall performance and produces more air pollution.


Typical diesel car intake manifold area
Typical diesel car intake manifold area


Now we have one more reason to do this regularly because of car’s safety. In recent events from BMW EGR issue, experts say there is a reasonable doubt about carbon sludge buildup can cause EGR valve clogged up. So a question comes down to,

How often should you clean intake manifold?

Clean EGR Valve with no carbon waste
Clean EGR Valve with no carbon waste


There is no definitive answer to this question. But if you drive in congested areas, it would be advised to have your car checked out by intake manifold cleaning expert once in a while. Intake manifold cleaning (removing carbon sludge) takes a lot of time. First off, you need to wait for the engine to cool down before disassembling task. Secondly, disassembling work by itself takes a while, too. (And same for the assembling time)


Audi A6 D Clean user case

Is there any other way?

As it’s more than half a day job, people are wondering if there is any other way than manual cleaning. So they look for engine additives but this won’t clean intake manifold area.  However, there is one good alternative solution. D Clean which is adaptor type product for intake manifold can keep carbon sludge from building. Cleaning liquid will be discharged when there is a condition for carbon waste is produced.

In other words, a driver standpoint, one doesn’t have to do anything. D Clean will kick in whenever it is in need. This doesn’t use engine’s resources as it is a standalone system.


Red part is D Clean adapter
Red part is D Clean adapter


This Audi A6 owner installed D Clean several months ago. He has not done intake manifold cleaning for years. When he installed D Clean, he saw large size carbon sludge buildup in front of intake manifold area. Without a doubt, he must have had a lot of carbon waste in the intake manifold area.

Check out this photo of aftermath of D Clean installation. Now it’s very clean.





Not only D Clean prevents it from building up but also it literally cleaned carbon sludge in the intake manifold area over time. This means, you don’t have to do manual cleaning at all. Audi A6 owner said, he felt as if his car was like a new car after D Clean use.

Check out a short video clip.