BMW E87 E90 E91 Connecting Line Oil Separator 7542633

BMW E87 E90 E91 Crankcase Vent Hose is an original component of the crankcase ventilation system, designed for selected 1 and 3 Series models. This used hose from the Other category allows for a technically compliant, factory-standard repair of the crankcase ventilation system, while maintaining a favorable price-to-quality ratio. It is a practical solution for users who want to restore proper engine function without altering its construction.

Specifications and technical data

• SKU: 7542633
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 11157542633
• Substitutable numbers: 11157542633, 7542633, PK
• Category: Other Engine Parts

Purpose and Function of the Crankcase Vent Hose

The BMW E87 E90 E91 Crankcase Vent Hose operates within the crankcase ventilation system, responsible for the controlled discharge of gases from inside the engine to the intake system. A correctly selected and sealed hose:

• stabilizes crankcase pressure,
• limits the uncontrolled escape of oil vapors,
• supports smooth engine operation,
• reduces the risk of leaks and contamination of engine accessories.

By maintaining factory geometry and connection diameters, the component ensures correct gas flow in the ventilation system, which is crucial for stable engine performance under various load conditions.

Benefits of Using an Original BMW Hose

Using an original connecting hose to replace a worn or leaking component offers tangible operational benefits:

• Factory Fitment – correct length, shape, and connector diameters facilitate installation in the engine bay without modifications.
• Stable Crankcase Ventilation Operation – reduces the risk of air leaks, power loss, or unstable idle speeds.
• Engine Accessory Protection – a properly functioning ventilation system reduces the tendency for excessive oiling of intake hoses and surrounding components.
• Reasonable Repair Cost – a used OEM part allows for a technically correct repair without the need to invest in more expensive, unverified aftermarket alternatives.

Condition, Verification, and Practical Application

The offered crankcase vent hose is a used item, meaning it comes from a dismantled vehicle and has been verified for its suitability for further use. This type of part is particularly useful in situations where:

• the original hose has cracked, delaminated, or lost its flexibility,
• there are signs of crankcase ventilation system leaks (oil in unintended places, exhaust smell, unstable idle),
• a quick, technically correct replacement is needed without long waits for new components.

By retaining its original design, the hose can be installed as a direct replacement for the factory part, simplifying the mechanic's work and reducing vehicle downtime.

Application in Service and Diagnostics

During crankcase ventilation system diagnostics, mechanics often recommend replacing crankcase vent hoses when signs of wear or mechanical damage are detected. Installing a functional connecting hose:

• facilitates further assessment of the crankcase vent valve and other system components,
• allows for the elimination of one of the common causes of intake system leaks,
• is a simple preventive step during larger service work on the engine.

This solution is particularly beneficial for users who want to maintain their vehicle in good technical condition while controlling maintenance costs.

Other Parts and Technical Knowledge

If you are looking for other products from the BMW Other category, check out our dedicated offer: BMW other parts and accessories in the Other category. This will help you easily assemble additional components needed for service work on the engine and accessories.

When planning repairs and upgrades, it is also worth expanding your knowledge about the design differences between sports and standard versions. In this context, an article describing the construction of engines, brakes, and chassis in high-performance cars may be helpful: Audi RS vs. Other Models – What Lies Under the Hood and Chassis?. This will help you better understand the crucial role of a properly functioning crankcase ventilation system in modern engines.

If you have doubts regarding the selection of used market parts, it is worth familiarizing yourself with a reliable discussion on the topic: Used Car Parts: Myths and Facts You Need to Know. This is a practical compendium of knowledge that helps you make informed purchasing decisions regarding used components, such as a crankcase vent hose for BMW.