BMW Crankcase Vent, PCV, and Oil Separator Systems

Every car has a crankcase vent system that is supposed to suppress oil from making it into the intake ports and combustion chamber. A good functioning system will separate oil from the atmosphere and return it to the oil pan (or collect it in a catch can) while allowing the leftover vapors to burn in the combustion chamber or recirculate through the system. This has always been known as a PCV system (Positive Crankcase Ventilation) but BMW has several other names for it - oil separator, crankcase vent (CCV), and cyclonic separator. Failures in the system will allow raw oil to enter the intake and eventually into the engine itself which can have disastrous effects on engine performance and longevity. As emissions regulations on oil and gas venting have gotten more stringent the PCV systems have gotten more complex and failure prone. And because the CCV is intertwined with other systems you could have rough running, loss of power, higher oil consumption, misfiring, stalling, or other annoying issues. There is no replacement interval for these so we recommend inspecting your crankcase vent system as part of your regular maintenance routines. Symptoms of a bad crankcase vent are: whitish or yellowish film on the underside of the oil cap, whistling/squealing noises (not caused by a belt), suction on the oil cap that makes it hard to unscrew, large amounts of white smoke from the exhaust, and excessive oil consumption.

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Turner Baffled Oil Catch Can Kit - 8oz
Turner Motorsport
T#: 398784
Mfg#: 022798tms01-07KT
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Angle Connector With Heating Element - N52
Genuine BMW
T#: 388946
Mfg#: 11618638014
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$96.02 10% off MSRP
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Crankcase Oil Separator Repair Kit - E46 E39 X5
Packaged by Turner
T#: 337996
Mfg#: 11617534237
Turner Baffled Oil Catch Can Kit - 10oz
Turner Motorsport
T#: 398786
Mfg#: 022798tms01-09KT
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Valve Cover With PCV
Vaico
T#: 553947
Mfg#: 11127646555
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Valve Cover With PCV
Hamburg Tech
T#: 555786
Mfg#: 11127646555
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$160.00
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ECS Baffled Oil Catch Can System - E46 M3
ECS
T#: 394194
Mfg#: 015515ecs01-01KT
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Valve Cover With PCV
MTC
T#: 555591
Mfg#: 11127646555
Genuine BMW Vent Pipe - 11157589989
Genuine BMW
T#: 32290
Mfg#: 11157589989
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$55.18 13% off MSRP
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Comprehensive Constant Pressure Valve Replacement Kit
Packaged by Turner
T#: 557341
Mfg#: 11111318185TMSKT
Turner Baffled Oil Catch Can Kit - 6oz
Turner Motorsport
T#: 398782
Mfg#: 022798tms01-05KT
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Oil Separator Vent Hose
Genuine BMW
T#: 359629
Mfg#: 11617522933
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$28.51
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Turner S54 Baffled Oil Catch Can System
Turner Motorsport
T#: 398803
Mfg#: 015515TMS01-01KT
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E30 M3 Oil Separator
Genuine BMW
T#: 14452
Mfg#: 11152241124
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$55.07 20% off MSRP
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N20/N26 Mishimoto Baffled Oil Catch Can
Mishimoto
T#: 389788
Mfg#: MMBCCN20N2612CB
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Genuine BMW Connecting Line - 11157646086
Genuine BMW
T#: 174248
Mfg#: 11157646086
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$404.61 11% off MSRP
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N54 Mishimoto Baffled Oil Catch Can
Mishimoto
T#: 383384
Mfg#: MMBCCN5406CBE
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