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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 03-19-2017, 06:05 AM
jestn7 jestn7 is offline
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Sea Foam in vacuum system to clean CCV?

I'm interested in using Sea Foam to clean the CCV in my 97 2.8 engine. Has anyone ever injected Sea Foam into the vacuum line as a preventative measure to clean the CCV? I have a small oil leak that I'm in the process of looking for the source. A friend suggested adding Sea Foam into the vacuum system to make sure the CCV wasn't plugged. He said that a plugged CCV can be a contributing factor to oil leaks. Thanks!


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  #2  
Old 03-19-2017, 02:21 PM
danomite danomite is offline
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Mein Auto: SC'd Z3 3.0 Coupe
I've used Seafoam in my intake system, but I doubt it'll do much to clean the CCV. It's more use to the manifold and intake tract of the cylinder head. The CCV systems on our cars fail because they're made of cheap plastic material, and they deteriorate due to age and heat cycling. If you've never replaced or inspected your CCV, NOW is the time to do it. You can also eliminate the substandard oe setup, and make a pressurized, drainable catch can system. Then you won't have the ticking time bomb oe CCV system to worry about ever again. ;-)
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Old 03-19-2017, 02:30 PM
Blacklane Blacklane is offline
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The usual failure mode is a broken diaphragm. There are also quite a few problems that result from freezing weather in cars without the cold-weather version. Seafoam won't help those problems.

The CCV can clog due to sludge build-up, but good-quality motor oil that is changed regularly is generally sufficient.

The down side to adding Seafoam in this way is that the CCV is an integral part of the oil system. Adding Seafoam will dilute the oil and reduce its lubrication ability. You could do serious damage to the engine without knowing it.

You might also appreciate this thread: http://www.bimmerfest.com/forums/sho...d.php?t=527430
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Old 03-19-2017, 03:31 PM
jestn7 jestn7 is offline
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Thanks everyone! I really appreciate the feedback.


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  #5  
Old 03-19-2017, 05:21 PM
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vintage42 vintage42 is offline
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Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by Blacklane View Post
... The CCV can clog due to sludge build-up, but good-quality motor oil that is changed regularly is generally sufficient... the CCV is an integral part of the oil system. Adding Seafoam will dilute the oil and reduce its lubrication ability. You could do serious damage to the engine without knowing it...
Had not thought about the CCV like that. Seafoam cleaner is just for the fuel where it can be burned, not for the CCV where it can pass raw into the oil.
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