Quote:
Originally Posted by upallnight
What would you use to clean the CCV? Can you leave it connected and then do an oil change if you use solvent to clean it?
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You are cleaning out all the paste in it, and in the lines. Also inspecting the lines to see if any have gone soft. In some CCVs (I don't think all of them) there is a replaceable rubber diaphram that BMW sells a repair kit for. You would have to take the CCV off to clean it properly, so most just replace it after having done that much work.
Doing a hot oil change doesn't clean out the CCV, since oil doesn't circulate through it, only crankcase fumes.
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