How to test the BMW E39 pressure-controlled crankcase ventilation system (CCV)?
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German Auto Solutions M54 CCV Replacement Kit
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Crankcase Pressure Regulator Valve (Oil Separator) for BMW
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Crankcase Vent Valve Breather Hose Kit for BMW E46, E39, E60 - 5
Bimmerforums - The Ultimate BMW Forum
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Timm's BMW M60, M62, M62TUB and N62TUB V8 Engines - PCV, PRV and OSV
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Crankcase Ventilation Valve Failure in a BMW: Expert Advice from
DIY: Understanding the N55 PCV Valve of Doom - BMW 3-Series (E90
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IHKA AC. First steps
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CCV Oil Separator System for BMW 5 Series E39 (1996-2003)
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Bad PCV Valve Symptoms and How to Test the PCV Valve Yourself
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Crank Case Ventilation Valve Test CCV BMW E46 E39 E53
How to test the BMW E39 pressure-controlled crankcase ventilation
Breakdown:X5M CCV system & dual catchcan plans