Oil Separator BMW E87 E90 E60 E65 Cranckcase Ventilation Breather Valve 7531423

Oil Separator BMW E87 E90 E60 E65 Cranckcase Ventilation Breather Valve is an original crankcase ventilation system component designed for N52 petrol engines in 1 and 3 series models. It is responsible for stable separation of oil mist from gases before they return to the intake, which promotes cleaner engine operation and reduces carbon deposit buildup. This used OEM part is a solution technically matched to BMW's factory specifications, allowing for an economical yet professional repair.

Specifications and technical data

• SKU: 7531423
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7531423
• Substitutable numbers: 11617531423, 7531423, Petrol
• Category: Other Engine Parts

Function and role of the oil separator in the N52 engine

In BMW N52 petrol engines, the breather system plays a key role in controlling crankcase pressure and managing oil vapors. The oil separator is responsible for:

• separating oil particles from gases before they return to the intake manifold,
• reducing oil consumption resulting from oil mist suction,
• stabilizing engine operation across a wide range of loads,
• reducing the risk of contamination in intake ducts and intake valves.

As a result, the intake system remains in better condition, and the engine maintains more consistent performance parameters over a longer service life.

Why it is worth using an original BMW component

The oil separator in this configuration is a component from the original BMW line, which means full compatibility with the geometry and operating characteristics of the N52 engine. In practice, this translates into:

• proper operation of the ventilation system without the need for installation modifications,
• compliance with factory mounting points and hose routing,
• maintaining engine performance parameters in accordance with the manufacturer's design.

The used OEM component is particularly attractive for repairs where a combination of technical correctness and reasonable service costs is important, while maintaining the original system design.

Purpose and application in BMW vehicles

The presented breather – oil separator has been designed for petrol engines in BMW 1 Series E87 and 3 Series E90 models in the 330i version with the N52 engine. Using the correct component in this system is important for:

• maintaining proper vacuum in the crankcase,
• reducing leaks and oil suction into the intake,
• stable operation at idle and under dynamic load.

Thanks to the preservation of factory assembly specifications, the replacement process is predictable for the mechanic, without the need for adaptation or installation modifications.

Condition of the component and assembly aspects

The offered oil separator is a used component, which allows for an economical restoration of the breather system efficiency in BMW cars with the N52 engine. Before installation, a standard visual inspection and a check of the tightness of the hoses working with the breather are recommended so that the entire ventilation system works consistently.

In practice, when replacing this component, workshops often combine the operation with checking the condition of vacuum hoses and intake elements, which helps reduce the risk of recurring symptoms such as unstable idle or increased oil consumption.

Expanding technical knowledge and part selection

For users interested in a broader context of how modern petrol engines work and comparing solutions used in different brands, an article discussing the design of engines and accompanying systems in high-performance cars may be helpful – you can find it here: Audi RS vs other models – what is hidden under the hood and chassis?. This is a good supplement to the knowledge about how manufacturers design fuel, lubrication, and cooling systems in more powerful model versions.

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 ventilation hoses, mounting elements, or additional breather system components, check the available parts in the Other BMW category.