PCV Membrane – BMW M56 | OEM 11127521086

11127521086 PCV Membrane for BMW M56 Valve Cover

This PCV membrane is designed for BMW M56 engines using valve cover number 11127521086. It replaces the failed diaphragm inside the crankcase ventilation valve area and helps restore proper PCV system operation.

The membrane is intended for targeted repair of the existing BMW M56 valve cover ventilation system. It is not a complete valve cover, complete crankcase ventilation valve, or full oil separator assembly.

OEM / Reference Numbers

Primary OEM / valve cover reference number:

• 11127521086

Secondary OEM / reference numbers:

• No additional OEM or reference numbers are specified on this product page.

Product reference:

• SKU: KL11127521086

Part Type

• PCV membrane
• crankcase ventilation valve diaphragm
• valve cover membrane
• BMW M56 PCV diaphragm
• engine breather membrane
• oil separator diaphragm repair component

What This Part Does

The PCV membrane helps regulate crankcase pressure and controls the flow of blow-by gases through the crankcase ventilation system. In BMW M56 engines, the rubber membrane can lose elasticity, crack around the sealing perimeter, and stop maintaining correct pressure control.

Replacing the failed membrane helps restore the function of the valve cover PCV system and can reduce ventilation-related oil burn, unstable running and rough engine operation.

Compatible Vehicles

This PCV membrane is listed for BMW vehicles equipped with the M56 engine and valve cover number 11127521086.

• BMW M56 engine applications
• BMW E46 325i SULEV application mentioned in the product text

The product page does not provide a full model-year fitment table. Compatibility should be confirmed by checking the original valve cover number and comparing the membrane design.

Engine / Engine Family / Technical Detail

• BMW M56
• BMW SULEV engine application
• Replacement rubber PCV membrane
• Designed for valve cover number 11127521086

Common Symptoms of Failure

• intermittent oil burn
• unstable or choppy engine operation
• rough idle
• loss of membrane elasticity
• microcracks around the sealing perimeter
• incorrect crankcase ventilation pressure
• oil separator or PCV system malfunction symptoms

Why Choose This Replacement

• Targets the exact repair intent for 11127521086
• Replaces the failed PCV membrane inside the existing BMW M56 valve cover
• Cost-effective alternative to replacing the complete valve cover when only the membrane has failed
• Helps restore crankcase ventilation and pressure regulation
• Designed for BMW M56 valve cover diaphragm repair

Important Before Ordering

• Check that your original valve cover number matches 11127521086.
• Confirm that your vehicle uses a BMW M56 engine.
• Compare the membrane shape and sealing edge with the diaphragm installed in your original valve cover.
• This product is a PCV membrane only, not a complete valve cover or complete crankcase ventilation valve.
• Verify compatibility by valve cover number, engine type and part design before ordering.

FAQ

• BMW

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