BMW G20 G21 G22 G23 G26 Automatic Gearbox Cooling Flow Hose Line Pipe 8654905

BMW G20 G21 G22 G23 G26 Automatic Transmission Oil Cooler Hose is an original component of the transmission cooling system, designed for automatic transmission models in the 3 and 4 Series. Its factory-fit design ensures stable oil flow, supporting safe transmission operation and reducing the risk of overheating during daily use. This is the solution for users seeking a proven OEM component for professional repair or replacement of the cooling hose.

Specifications and technical data

• SKU: 8654905
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8654905
• Substitutable numbers: 8654905, 17228654905
• Gearbox type: Automatic
• Part type: Oil Cooler Hose
• Category: Oil Coolers & Lines

Purpose and Function in the Transmission Cooling System

This automatic transmission oil flow hose is specifically designed to work with the oil cooler in BMW G20, G21, G22, G23, and G26 models equipped with an automatic transmission. It is responsible for directing transmission oil between the gearbox and the cooler, which helps maintain a stable operating temperature and improves the durability of the entire drivetrain.

Thanks to its construction conforming to factory BMW standards, the hose maintains the correct flow cross-section and routing geometry, minimizing pressure drops and the risk of leaks at critical installation points.

Compatibility with Automatic Transmission

This part is designed for vehicles with an automatic transmission, where stable oil cooling is crucial for smooth gear changes and protection of internal components. Using an original oil flow hose helps maintain:

• proper oil circulation between the transmission and the cooler,
• adequate transmission operating temperature under load,
• consistency with factory mounting and hose routing systems.

This is particularly important in modern BMW G-Series models, where the transmission oil cooling system is precisely tuned to the control electronics and transmission operating characteristics.

Technical Category: Oil Coolers and Hoses

This hose belongs to the Oil Coolers and Hoses category, which includes components responsible for transporting and dissipating heat from the working oil. Replacing a worn or damaged hose with an original component helps restore system integrity, reduce the risk of leaks, and ensure stable transmission operating conditions across a wide temperature range.

If you are planning a comprehensive repair or upgrade of the transmission oil cooling system in your BMW and need other parts from the same category, such as additional hoses, return lines, or cooler connection components, check the available parts in the BMW Oil Coolers and Hoses category.

Condition, Origin, and Benefits of Choosing Used OEM Parts

The offered hose is an original BMW part sourced from disassembly, meaning it retains its factory geometry, connection diameters, and compatibility with standard mounting points in the G20, G21, G22, G23, and G26 body. A used OEM part is a sensible choice for drivers who want to balance cost control with adherence to the manufacturer's original specifications.

In practice, this translates to:

• easier installation without the need for modifications,
• secure fit to factory spigots and brackets,
• maintenance of manufacturer-specified flow parameters.

How to Verify Compatibility Using OEM Numbers

To ensure the automatic transmission oil cooler hose is fully compatible with your BMW, it is advisable to compare OEM numbers and interchangeable numbers with your vehicle's documentation or the markings on the old part. Helpful tips for safely selecting components by number can be found in the guide Risk-Free Online Parts Shopping – Verifying Compatibility by OEM Numbers, prepared for BMW users.

Support for the Cooling System in Summer Conditions

A functional oil flow hose is particularly important during periods of high temperatures, when the thermal load on the automatic transmission increases. Leaks or restricted flow can lead to oil overheating, which accelerates transmission wear. It is worth reading our guide Summer Heat vs. Cooling System: Used Coolers and Fans Guarantee Savings to better understand how to care for your car's cooling system and how to consciously utilize the potential of used components.