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BMW E46 330Ci: Replacing crankcase ventilation pipe (CCV)
3.0L: CCV Failure and Replacement
Crankcase Breather Oil Separator Handy For BMW E46 E90 E91 E81 E83 X3 Z4 316 318 Crank Ccv Case Vent Valve Hoses Kit 11157533346 - AliExpress
BMW has an ongoing issue with oil separators freezing in cold weather if driving is done before the vehicle is fully warmed up. There is often a howling noise followed by numerous oil leaks. The crankcase breather valve is used to purge the oil vapor from the engine block into the valve cover. However, sometimes condensation can cause it to freeze, causing the entire oil separator system to fail, crack, and disintegrate.
BMW Crankcase Vent Valve - Febi Bilstein 11617501566
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CCV Oil Separator System for BMW E46 M3 S54 3.2L (1999-2005)
SHINEHOME PCV Crankcase Ventilation Oil Separator Hose - Compatible with BMW E46 3 Series E39 E60 X3 X5 - Replace 11157532649 11617501566
Bimmerforums - The Ultimate BMW Forum
Tuningsworld Crankcase Vent Valve Breather Hose and Oil Separator Kit Compatible for BMW