Mercedes-Benz W204 (C300, E350, ML350, & More) Crankcase Breather Repair Kit - Features, Symptoms, And Product Review

Blog Feature

This crankcase breather repair kit is designed for Mercedes-Benz models featuring the M272 V6 engine produced from 2006 through 2011. Our kit includes everything you need to overhaul your crankcase breather system. 

For your car's PCV system to function properly, it must be able to divert oil vapor from the crankcase. To do so, the crankcase needs to have a source of clean air in which the crankcase breather valve provides. When your crankcase breather valve isn't functioning as it should, this allows a buildup of excess fumes, in turn causing your car to burn oil. 



Mercedes-Benz W204 Crankcase Breather Failure Symptoms

Mentioned above, when your crankcase breather isn't supplying fresh air to your crankcase and allowing excess pressure to vent, your car will begin to burn oil. The oil is burned through the various caps on the PCV system, including at the back of the head and on the oil separator.

There aren't too many symptoms of a failing crankcase breather valve on your Mercedes-Benz W204; however, the few there are tend to be pretty simple. These symptoms are:

  • Oil leaks
    • To easily inspect for oil leaks, look for the screws on the back of the crankcase breather cover. If they are silver and shiny, that means there aren't leaks. If there are leaks, those screws will be oily and dirty.
  • High idle
  • Noticeable decrease in performance

Since your PCV system is made up of multiple components, we recommend replacing all of them while you're in there. Longer-than-recommended oil change intervals allow for build up of dirty oil residue inside the hoses and valves, which in turn, either limits their ability to operate optimally, or restricts airflow. 

If you're to notice symptoms, they usually start arising around the 100,000 mile mark. 


Mercedes-Benz W204 Models Applicable

This crankcase breather valve repair kit fits a wide range of Mercedes-Benz W204 models with the M272 V6 engine between the years 2006 and 2011, including:

  • 2005-2011 Mercedes-Benz SLK350
  • 2006-2011 Mercedes-Benz E350
  • 2006-2011 Mercedes-Benz ML350
  • 2006-2007 Mercedes-Benz C230
  • 2006-2011 Mercedes-Benz C350
  • 2006-2009 Mercedes-Benz CLK350
  • 2006-2011 Mercedes-Benz R350
  • 2006-2008 Mercedes-Benz SLK280
  • 2008-2012 Mercedes-Benz C300
  • 2009-2011 Mercedes-Benz SLK300
  • 2010-2012 Mercedes-Benz GLK350


Mercedes-Benz W204 Crankcase Breather Kit 3D Parts Diagram

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Parts Included with Mercedes-Benz W204 Crankcase Breather Repair Kit


Additional Parts Required with Mercedes-Benz W204 Crankcase Breather Repair Kit

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Special Tools Required with Mercedes-Benz W204 Crankcase Breather Repair Kit

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Additional Parts Recommended with Mercedes-Benz W204 Crankcase Breather Repair Kit

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Aftermarket Upgrades for Mercedes-Benz W204 Crankcase Breather Repair Kit

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Since everything in this kit will need to be replaced in the future, it's a good thing that everything in it comes with our Lifetime Replacement Guarantee like everything else we sell. You can drive your car for another 100,000 miles and when they need to be replaced again, just follow our return procedure. 

In the video below, Kyle Bascombe, our Mercedes Catalog Manager, gets up close with this Mercedes-Benz W204 Crankcase Breather Repair Kit. If you're unsure if this crankcase breather valve repair kit fits your car, you can verify the fitment by going to our homepage and using the vehicle selection tool in the upper left corner. As usual, if you like this Really Quick Product Review, subscribe and check back here for regular releases in the future.  

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