BMW G20 G21 G22 G23 G26 G42 Automatic Gearbox Oil Cooling Hose 8654907

BMW G20 G21 G22 G23 G26 G42 Automatic Gearbox Oil Cooling Hose is an original automatic transmission oil cooling system component, designed specifically for the new generation of BMW 3 Series, 4 Series, and related models. Thanks to its factory geometry and fitment, it ensures stable heat dissipation from the transmission oil, which supports the proper operation of the automatic gearbox and reduces the risk of overheating.

Specifications and technical data

• SKU: 8654907
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8654907
• Substitutable numbers: 8654907, 17228654907
• Gearbox type: Automatic
• Category: Coolant Hoses

Purpose and function in the cooling system

This hose belongs to the Cooling system pipes and hoses group and is responsible for transporting automatic transmission oil between the gearbox and the heat exchanger or oil cooler. Proper flow of oil at a controlled temperature:

• stabilizes the operating conditions of the automatic gearbox,
• reduces wear on friction elements and seals,
• helps maintain smooth gear shifting across a wide range of loads.

A properly selected oil cooling hose is particularly important in modern BMW models, where the automatic gearbox operates under high thermal loads.

Compatibility with BMW G20–G42 models

The component has been designed for the BMW G20, G21, G22, G23, G26, and G42 platforms, which means it fits factory mounting points and routing in the engine bay. Proper hose routing:

• minimizes the risk of chafing and leaks,
• ensures collision-free placement relative to other components,
• facilitates service and potential future inspections of the oil cooling system.

As a result, installation is straightforward, without the need for vehicle modifications.

Technical characteristics and installation

The hose is designed for use with an automatic gearbox, where maintaining proper pressure and transmission oil flow is required. The hose construction is adapted for operation at elevated temperatures and in an oil environment, which helps maintain tightness and dimensional stability over a long service life.

During installation, it is recommended to:

• check the condition of the connection ports on the gearbox and heat exchanger,
• replace seals in accordance with the BMW service procedure,
• bleed the system and verify tightness after starting the engine.

This approach allows you to fully utilize the benefits of the factory hose and reduce the risk of transmission oil leaks.

Component condition and service application

The offered hose is a used component, making it an attractive solution for service repairs where reasonable cost is important while maintaining original BMW specifications. It can be used both for fixing leaks in the automatic gearbox oil cooling system and for replacing damaged hoses after a collision or overheating.

Choosing an original oil cooling hose allows you to maintain the integrity of the entire drivetrain, thereby supporting trouble-free operation of the automatic gearbox in daily driving and under higher loads.

Technical support and related components

If you are planning a comprehensive repair or upgrade of the cooling system area in your BMW and need other components from the same group, such as additional pipes, hoses, or connecting sections, check the available parts in the BMW cooling system pipes and hoses category.

To better understand the impact of an efficient cooling system on the durability of the powertrain and accessories, it is worth reading the service guide: Engine cooling system – overheating, repair, and used radiators. This will allow you to consciously plan work on the automatic gearbox oil cooling system and avoid common installation errors.