11127823181 PCV Diaphragm Repair Kit for BMW N57, N57N, N57T, N57S, N57X
This PCV diaphragm repair kit is designed for BMW diesel engines using OEM number 11127823181. It repairs the crankcase ventilation system by replacing the failed internal PCV membrane and retention cap instead of replacing the complete valve cover assembly.
The kit is intended for BMW N57 engine family applications where a torn or worn crankcase ventilation membrane causes incorrect crankcase pressure, oil consumption, whistling noise, rough idle, or oil leaks.
OEM / Reference Numbers
Primary OEM number:
- 11127823181
Related valve cover OEM / reference numbers:
- 11128578811
- 11128515745
- 11127800309
- 11128507607
- 11128515746
- 11127812894
- 11128510234
Part Type
- PCV diaphragm repair kit
- crankcase ventilation valve repair kit
- oil separator membrane repair kit
- engine breather diaphragm and cap
- valve cover PCV membrane replacement
What This Part Does
The PCV diaphragm controls crankcase pressure inside the engine ventilation system. When the original membrane tears or becomes weak, the system can no longer regulate pressure correctly, allowing excessive oil vapor flow, vacuum leaks, whistling noise, oil consumption, and unstable idle.
Replacing the diaphragm and cap restores the pressure-control function of the crankcase ventilation system without replacing the full valve cover.
Compatible Vehicles
This PCV diaphragm repair kit is listed for BMW diesel vehicles equipped with N57 engine family variants.
- BMW 3 Series: E90, E91, E92, E93, F30, F31, F34 GT
- BMW 4 Series: F32, F33, F36 Gran Coupe
- BMW 5 Series: F07 GT, F10, F11
- BMW 7 Series: F01, F02
- BMW X3: F25
- BMW X4: F26
- BMW X5: E70, F15
- BMW X6: E71, F16
Engine / Engine Family
- BMW N57 diesel
- BMW N57N diesel
- BMW N57T diesel
- BMW N57S diesel
- BMW N57X diesel
Common Symptoms of Failure
- high oil consumption
- whistling or squealing noise at idle
- rough idle
- oil leaks caused by increased crankcase pressure
- smoke from excessive oil vapor entering the intake system
- unstable crankcase pressure regulation
Why Choose This Replacement
- Targets the exact OEM repair intent for 11127823181
- Includes the replacement PCV membrane and retention cap
- Allows repair of the existing valve cover PCV system
- Cost-effective alternative to replacing the complete valve cover assembly
- Helps restore correct crankcase pressure and ventilation function
- Designed for BMW N57 engine family applications
Important Before Ordering
- Check that your original valve cover or PCV system matches OEM 11127823181 or one of the listed related numbers.
- Confirm your BMW engine code before ordering.
- Compare the diaphragm and cap design with the part installed on your vehicle.
- This is a PCV diaphragm repair kit, not a complete valve cover assembly.
- If your vehicle has a different valve cover design, verify fitment before purchase.
FAQ
What does BMW 11127823181 fit?
BMW 11127823181 is listed for BMW diesel vehicles with N57 engine family variants, including N57, N57N, N57T, N57S and N57X engines. It is used on selected BMW 3 Series, 4 Series, 5 Series, 7 Series, X3, X4, X5 and X6 applications.
Is 11128578811 the same type of part as 11127823181?
11128578811 is listed as a related valve cover OEM number for this repair application. The product itself is a PCV diaphragm repair kit used to repair the crankcase ventilation function within the compatible valve cover design.
What does this PCV diaphragm repair kit do?
It replaces the failed internal PCV membrane and cap in the crankcase ventilation system. This helps restore correct crankcase pressure regulation and reduces symptoms caused by a torn or worn diaphragm.
What symptoms indicate failure of the N57 PCV membrane?
Common symptoms include high oil consumption, whistling noise at idle, rough idle, smoke, oil leaks, and pressure imbalance in the crankcase ventilation system.
Is this a complete valve cover assembly?
No. This product is a PCV diaphragm repair kit with a replacement membrane and retention cap. It is not a complete valve cover assembly.
How do I confirm compatibility before ordering?
Confirm the OEM number on your original valve cover or PCV system, check that your engine belongs to the BMW N57 family, and compare the diaphragm and cap design with your existing part before ordering.
Read All
Orders ship within 1–2 business days.
Standard delivery:
- USA: Some items ship from our US warehouse and arrive within 3 business days.
- USA-EU: 10–21 business days
- Worldwide: 14–30 business days
Shipping cost is shown at checkout.
Can I exchange or return an item?
Yes, you can exchange or return an item within 14 days of purchase. This right is guaranteed to you by the Law on the Protection of Consumer Rights
To use this feature, please make sure that:
- the product was not in use and has no traces of use: scratches, chips, abrasions, etc.
- the goods are fully completed and the integrity of the packaging is not violated
- retained all labels and factory markings