BMW E90 E91 E92 335d M57N2 Crankcase Breather Vent Valve Oil Separator 7809512

BMW E90 E91 E92 335d M57N2 Crankcase Breather Vent Valve Oil Separator is a crankcase ventilation system component, specifically designed for the M57N2 engine in the BMW 3 Series. It is responsible for effectively separating oil mist from gases before they return to the intake, which promotes stable operation of the diesel engine. Thanks to the use of the original BMW design, this component helps maintain proper lubrication parameters and reduce contamination of the intake system.

Specifications and technical data

• SKU: 7809512
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7809512
• Substitutable numbers: 11127809512, 7809512, 11127803790, 7803790, F01C470034
• Category: Oil Pumps & Parts

Technical function and role in the lubrication system

The crankcase breather with oil separator in the M57N2 engine plays a key role in controlling pressure within the crankcase. Blow-by gases are directed through the separator, where they are cleaned of oil particles and then controlledly discharged into the intake system. This design reduces oil consumption, minimizes carbon deposit buildup in the manifold and on the valves, and helps maintain smooth operation of the power unit.

A properly functioning vent valve stabilizes the pressure inside the engine, which translates into less stress on seals and sealing elements. In the case of a high-performance diesel engine like the 335d, a functional oil separator is important for maintaining consistent performance and reducing smoke during dynamic acceleration.

Compatibility and fitment for BMW 335d M57N2

The presented component has been developed for the M57N2 engine installed in BMW 3 Series E90, E91, and E92 models in the 335d version. This ensures the preservation of factory geometry, mounting points, and connection diameters, which facilitates installation in place of the worn-out part. The original BMW design ensures compatibility with factory engine control maps and lubrication system parameters.

As a result, there is no need to modify the installation, and replacement is limited to the service procedures provided by the manufacturer. This solution is particularly beneficial for users who want to maintain the original character of the car while ensuring the proper operation of the breather system.

Benefits of using an original oil separator breather

Using the correct oil separator in a high-performance diesel engine brings measurable operational benefits. The most important include:

• more stable pressure in the crankcase and a lower risk of leaks at the seals,
• reduction in the amount of oil entering the intake, which promotes cleanliness of the manifold and intercooler,
• more consistent turbocharger operation due to less oil in the airflow,
• better operating conditions for the exhaust gas recirculation system over long-term use.

A functional ventilation system is especially important in vehicles that have been chip-tuned or used intensively on highways, where the engine often operates under higher loads. In such conditions, an oil separator with factory parameters helps maintain the stability of the power unit.

Product characteristics and condition

The offered item comes from the Oil pumps and parts group, which emphasizes its close connection to the lubrication system and oil circulation in the engine. The product is in used condition, making it an attractive solution for users looking for original BMW components at a reasonable price, while maintaining the factory design and fitment.

For easier identification, manufacturer markings and interchangeable numbers have been used, allowing for precise selection of the part for a specific vehicle configuration. In case of doubt, it is worth comparing the shape of the housing, the arrangement of the connectors, and the mounting method with the part currently installed in the car.

Selection by numbers and technical support

When selecting a crankcase breather with an oil separator for the BMW 335d M57N2, it is crucial to verify compatibility by OEM number or by reference numbers assigned to the specific engine variant. This allows you to avoid installation problems and guarantees that the vent valve will operate within the parameters specified by the manufacturer.

To better understand the importance of using original components in cars of the Bavarian brand and the procedures for selecting parts by VIN and catalog numbers, it is worth reading the article: BMW – sports performance and precision. How do original used parts extend the life of a Bavarian icon?

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as oil pump housings, oil flow control modules, or additional lubrication system components, check the available parts in the BMW Oil pumps and parts category.