BMW G01 G02 G20 G21 Crankcase Ventilation Breather Air Line M40i B58D 8699312

BMW G01 G02 G20 G21 Crankcase Ventilation Breather Air Line M40i B58D is an original component from the Lines, hoses and pipes group, designed for the engine system in modern BMW X3/X4 and 3 Series models. Thanks to its factory geometry and precise fit for the M40i B58D unit, it ensures stable medium flow and proper ventilation, supporting trouble-free engine operation. This is a solution for users who expect precise fitment and the maintenance of factory engine performance parameters.

Specifications and technical data

• SKU: 8699312
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8699312
• Substitutable numbers: 11158699312, 8699312
• Part type: Line
• Category: Hoses, Lines & Pipes

Purpose and function of the breather line

The breather line used in the M40i B58D unit is responsible for controlled gas discharge and pressure stabilization in the selected area of the engine system. A correctly selected component of this type:

• reduces the risk of leaks in the system,
• supports the maintenance of proper engine performance parameters,
• prevents unwanted power drops resulting from line depressurization,
• facilitates maintaining smooth engine operation across the full load range. In the case of modern BMW engines, such as the M40i B58D, the selection of a line with the appropriate diameter, shape, and flexibility has a direct impact on the stability of the entire system.

Compatibility with BMW G01, G02, G20, G21 models

The offered line has been designed for BMW G01, G02, G20, and G21 platforms equipped with the M40i B58D unit. This means that the connection geometry, length, and routing of the line are adapted to the factory layout in the engine bay of these models. As a result:

• installation takes place at existing mounting points,
• there is no need to modify adjacent components,
• the original routing path of the line in the engine bay is maintained. Such fitment is particularly important in the densely packed engine bays of modern BMWs, where every component has a strictly defined position.

Characteristics of the original BMW line

As a BMW brand component, the breather line has been manufactured in accordance with the manufacturer's requirements regarding resistance to temperature, vibration, and contact with operating fluids. In practice, this means:

• properly selected material flexibility, reducing the risk of cracks during temperature changes,
• dimensional stability during long-term operation,
• compatibility with factory connectors and mounting clamps. Thanks to maintaining the original specification, the line works with other system components without the need for adaptation or the use of additional adapters.

Component condition and service application

The product comes from our used parts inventory, which allows for economical repair while maintaining the factory design of the line. This type of solution is often chosen in the case of:

• repairs after mechanical damage in the engine bay,
• eliminating leaks resulting from the wear of the previous line,
• preventive maintenance in cars operated under demanding conditions. Replacing the breather line with an original component allows you to maintain the integrity of the entire system and reduce the risk of problems resulting from poorly fitted replacements.

Support with selection and expanding the scope of repair

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as vacuum lines, cooling system hoses, or air intake pipes, check the available parts in the BMW Lines, hoses and pipes category. When planning broader service work, including suspension or chassis components, a guide material describing the selection of used components may be helpful. In this context, it is worth reading the article Standard vs. sports suspension – design differences and is it worth buying used suspension parts?, which organizes key issues related to assessing the condition and cost-effectiveness of using parts from the secondary market.