BMW Z4 E85 E90 N45 N46 N52 Manual Transmission Vent Pipe GS6-17BG/DG

BMW Z4 E85 E90 N45 N46 N52 Manual Transmission Vent Pipe GS6-17BG/DG is an original transmission system component designed for manual gearboxes in BMW cars with petrol engines. It is responsible for the controlled discharge of overpressure from the gearbox housing, which promotes stable transmission operation and reduces the risk of leaks. This is a practical service solution for users who want to maintain proper operating conditions for the gearbox in their BMW Z4 E85 and 3 Series E90 models with N45 and N46 units.

Specifications and technical data

• SKU: 7558137
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7558137
• Substitutable numbers: 7558137, 23007558137
• Fuel type: Petrol
• Gearbox type: Manual
• Category: Other Transmission & Drivetrain

Purpose and function of the vent pipe

The presented pipe is a component of the ventilation system for the GS6-17BG/DG manual transmission in BMW vehicles with petrol engines. Its task is to ensure proper air circulation inside the transmission housing so that temperature and pressure changes do not cause excessive stress on seals or unfavorable deformation of internal components.

A properly selected vent pipe helps maintain:

• stable operating conditions for the transmission oil,
• reduced risk of leaks at shaft seals,
• more predictable gearbox behavior across a wide temperature range.

Compatibility with N45/N46 units and manual transmission

The component has been designed to work with N45 and N46 series petrol engines and the GS6-17BG/DG manual transmission, used in, among others, the BMW Z4 E85 and BMW 3 Series E90. As a result, the pipe is structurally matched to the geometry of the gearbox and engine compartment, which facilitates installation and allows for maintaining the factory routing of the system.

Such a fit translates into:

• correct routing of the pipe in the engine compartment,
• minimization of stress on connection ports,
• compliance with factory mounting points.

Characteristics of the original BMW part

The vent pipe comes from the BMW line, which means compliance with the manufacturer's factory design and assembly standards. The original geometry and connection diameters promote a tight connection with the gearbox housing and other ventilation system components. For the user, this means the ability to maintain the configuration intended by the vehicle manufacturer without the need for modifications.

As a component removed from a vehicle, the pipe is a practical service solution for workshops and users who prefer parts consistent with BMW factory specifications while wanting to optimize drivetrain repair costs.

Service application and benefits of replacement

Replacing the vent pipe is recommended in situations where the existing component shows signs of wear, mechanical damage, or leaks. In the case of manual transmissions used in BMW Z4 E85 and E90 models with petrol engines, a functional ventilation system is important for the long-term operation of the gearbox.

The main benefits of using this pipe include:

• maintaining proper gearbox ventilation under typical road conditions,
• reducing the risk of oil leaks in the seal area,
• preserving the factory configuration of the BMW drivetrain.

Related components and technical knowledge expansion

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other components from the same group, such as additional vent pipes, mounts, or small installation parts, check the available parts in the Other BMW category.

For a comparison of design solutions used in sports models of other brands and a better understanding of the differences in drivetrain construction, it is worth reading an article discussing the specifics of powertrains and chassis – you can find it here: Audi RS vs other models – what is hidden under the hood and chassis?.