Breather Valve BMW E46 E83 E85 E87 E90 E91 Crankcase Intake 7503519

BMW E46 E83 E85 E87 E90 E91 Crankcase Vent Valve Oil Separator is an original component of the crankcase ventilation system, designed for selected BMW 3 Series, X3, and Z4 models. Thanks to its factory design, it ensures proper separation of oil mist from gases, which contributes to stable engine operation and reduces intake contamination. This is a practical solution for users who want to maintain their engine in good operational condition.

Specifications and technical data

• SKU: 7503519
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7503519
• Substitutable numbers: 7503519, 11617503520, 7503520
• Category: Other Air & Fuel Delivery

Function and Role of the Crankcase Vent Valve – Oil Separator in BMW

The crankcase vent valve – oil separator in BMW engines is responsible for the controlled removal of gases from the crankcase and their reintroduction into the intake system, while limiting the amount of oil entering the manifold. A properly functioning component:

• stabilizes crankcase pressure,
• reduces the risk of excessive oil consumption,
• limits carbon deposit buildup in the intake manifold,
• supports smooth, predictable idle engine operation.

For units used in BMW E46, E83, E85, E87, E90, and E91 series, a functional oil separator is crucial for maintaining proper operating parameters and for long-term engine longevity.

Compatibility with BMW Models

The presented BMW Crankcase Vent Valve – Oil Separator has been designed as an OEM part intended for specific generations of BMW vehicles. Its precise structural design allows for installation in selected versions of the E-series 3 Series, X3, and Z4, which simplifies servicing and reduces the need for modifications.

This ensures that the user receives a component that works seamlessly with the factory intake and ventilation system, preserving the original BMW engineers' intentions regarding gas flow and oil separation.

Benefits of Using an Original Oil Separator

Using an original crankcase vent valve – oil separator in a BMW engine offers a range of practical operational benefits:

• Better Oil Consumption Control – limiting the amount of oil drawn into the intake helps maintain a stable lubricant level.
• Smoother Engine Operation – proper crankcase ventilation promotes stable RPMs and correct throttle response.
• Reduced Intake System Contamination – less oil in the intake means slower deposit buildup.
• Consistency with Factory Design – an OEM component is designed for a specific BMW engine architecture.

For users who want to service their BMW consciously, choosing such a component is a sensible solution that helps maintain performance parameters close to factory specifications.

Condition and Service Application

The offered BMW E46 E83 E85 E87 E90 E91 Crankcase Vent Valve Oil Separator is a used part from disassembly and is intended as a replacement part for servicing. Such components are often replaced preventatively when symptoms like increased oil consumption, unstable idle, or excessive oil in the intake hoses occur.

Replacing the oil separator is particularly recommended for vehicles used in urban cycles, where the engine often operates under unfavorable thermal conditions. A correctly chosen component helps reduce the risk of further problems in the intake and exhaust systems.

Related Parts and Technical Knowledge

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other parts from the same group, such as crankcase vent hoses, separator housings, or ventilation system mounts, check the available parts in the Other BMW category.

For owners of the E90 series, knowledge about typical engine problems, their symptoms, and recommended preventative measures may be particularly useful – this is described in more detail in the article Troublesome BMW E90 Engines: Find Out What Can Ruin Your Budget!, which helps to better plan servicing and select appropriate components.

If you are also interested in the design differences between sports and standard versions of premium models, including engine, brake, and chassis solutions, additional information will be provided by the blog post Audi RS vs. Other Models – What's Under the Hood and Chassis?, which serves as a valuable supplement to knowledge about modern powertrain systems.