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Make sure you separate cause and effect. The CCV does not cause moisture in the oil. However, if you have moisture in the oil (and you seem to), then it can emulsify (making the white paste), and that paste collects in the CCV. There, it can freeze. However, the CCV does not cause the moisture, it is rather a victim of it.
If you have a lot of moisture built up, you should consider doing a couple of hot oil changes, fairly close together, to clean it out.
You haven't noted whether your coolant level is down. If so, then you potentially have a problem. If it isn't, then you could just have moisture in the exhaust system, where it builds up just like it does in the engine.
As to Sea Foam, if you Google it you will find supporters and detractors. Consider what it is: a collection of solvents, carried in a base of white gas (naptha). Naptha is often sold as Coleman camping fuel. There is also some alcohol mixed in. I suspect that the alcohol is to treat the water. Any solvent-based treatment can be harsh on engine components. If you felt you had a problem with injectors, then I would suggest a detergent-based cleaner like Techron. Personally, I won't put a solvent-based cleaner in one of my own vehicles. People have been using Sea Foam for 50 years or so. You need to make a judgement about whether there are any components inside your BMW that are more advanced than a 1957 Chevy Belair (as an example) and whether they may be damaged by the treatment. I would worry about sensors, MAF components, rubber parts, alloy components, and so on.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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