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This is good and interesting feedback. I'm assuming the CCV passages are getting clogged with carbon gunk to the point where it can't return the oil vapor fast enough, causing it to be pulled through and burned (smoke out the tailpipe). Cleaning the system opens up the passages again, allowing the system to work as designed.
This is my THEORY. Interested to hear other's thoughts that may know the CCV system on this engine better than I do.
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