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Old 06-04-2012, 04:52 AM
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Fudman Fudman is offline
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Location: Sudbury, MA
Join Date: Apr 2007
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Mein Auto: '02 530i Sport auto
Originally Posted by bluebee View Post
If the vapors condensed in the CCV tried to drain into the oil pan but couldn't drain because they were blocked ... wouldn't they just back up into the CCV?

Would the pressure burst the CCV drain hose?

Would the liquid finally back up higher and higher (filling the CCV?) or would it drip out?

Q1: Where does the liquid oil go if the CCV concentric drain is totally blocked?

Q2: How often do we need to clean the CCV concentric drain?

Q3: How does the dipstick guide tube work anyway (for example, why the hole)?
I believe the answer is yes, the oil would eventualy back up and clog the CCV resulting in total CCV failure. I don't think it would burst as it is not under pressure. I believe what then happens is that the liquid oil then goes into the intake manifold, via the connecting line and return pipes, where it is burned during combustion. That is when you see the black exhaust smoke and higher than normal oil consumption.
I don't think driving it is a near term problem because this problem existed before you decided to pull the dipstick tube. Hence, it has probably been clogged for awhile. Have you been experiencing smokey exhaust or higher than normal oil consumption? Is there mayo in your vent hose? That would tell you things are backing up. If not, I am sure it is OK for driving as is. But the problem needs to be addressed at some point.
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