Causes of blue smoke from diesel engines exhausts

Blue smoke coming from your engine is a warning sign you can’t ignore. It’s never a good sign and could indicate a problem with your engine, so the sooner you address it, the lower the risk of causing lasting damage

There are a number of possible causes for blue smoke coming from your engine – and that is why we’ve produced a 90-second animation to show you the most likely reasons for the problem.

This overview pinpoints the most likely causes – and none of them are good. But if you spot it early, know what to do and act on it, problems can be fixed. Running your engine to the recommended service and maintenance schedule; replacing gaskets, filters and other consumables when recommended, will significantly reduce the chances of blue smoke appearing.

Perkins has a wealth of knowledge about diesel engines amassed through 85 years of research, development and testing of its own models. When you buy a Perkins engine, you access this pool of expertise.


Blue smoke diesel engines


Potential issues

The possible sources of blue smoke are:

  • Worn valves or guide seals
  • Failure to change your oil or oil filter regularly enough
  • Damage or wear to pistons
  • Turbocharger issues


The solution

You need a three-step approach. It involves using:

If the video doesn’t go into sufficient detail, your local distributor is an excellent source of extra guidance and expertise.


All of the information within this animation is for general informational purposes only. It is not a full diagnostic guide and should not be used as such.

While Perkins uses reasonable efforts to ensure that the information herein is accurate and up to date we make no warranties or representations as to the accuracy of the content and assume no liability or responsibility for any error or omission in the content.

The information presented should not be construed as advice or opinion regarding specific facts and should not be acted upon without professional advice. Perkins recommends the use of the global Perkins Distributor network to carry out any diagnostic work, servicing, repairs or other work to Perkins’ engines.



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