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Old 05-24-2011, 06:41 AM   #3
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Join Date: Jun 2010
Location: CT
Posts: 2,132
My Ride: 2001 325i
The CCV itself can get plugged up and the dipstick drain from the CCV can get clogged up too. I recently had an oil leak and determined it was the oil pan gasket, which I replaced. The only other oil leak that pops up is the oil filter housing, which is in front of the CCV valve. I don't recall hearing anyone who posted about a rear main seal leak, although I'm sure that can happen.

The CCV parts can be bought from a discounting BMW dealer for under $150. Several have kits where they've put the parts together. Replacement is involved, but doable for the home mechanic. Here's the DIY I used:
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