BMW 1 3 Series F20 F21 F30 F31 LCI Hose Radiator Transmission Oil Cooler

BMW 1 3 Series F20 F21 F30 F31 LCI Hose Radiator Transmission Oil Cooler is an original transmission oil cooling system component designed for facelift models. Thanks to its factory geometry and robust construction, it ensures stable routing of the cooling medium between the radiator and the transmission, supporting safe drivetrain operation and reducing the risk of overheating.

Specifications and technical data

• SKU: 8601930
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8601930
• Substitutable numbers: 17128601930, 8601930
• Category: Oil Coolers & Lines

Purpose and function in the oil cooling system

The component described as BMW 1 3 Series F20 F21 F30 F31 LCI Hose Radiator Transmission Oil Cooler operates within the transmission oil circuit, connecting the transmission oil cooler to other system components. It is responsible for:

• safely discharging heated oil from the transmission to the radiator,
• returning the cooled medium to the gearbox,
• maintaining a stable operating temperature for the automatic or automated manual transmission,
• reducing thermal loads in both city and highway driving conditions.

By ensuring proper oil flow, the hose helps extend the service life of the transmission and maintain consistent gear shifting parameters.

Construction and compatibility with BMW 1 and 3 Series

The hose belongs to the Oil coolers and hoses group, meaning it is designed to operate in high-temperature and high-pressure environments. Its original BMW origin translates into:

• precise fitment for F20/F21 (1 Series) and F30/F31 (3 Series) LCI body styles,
• compatibility with factory mounts and brackets in the engine bay,
• appropriate diameter and shape ensuring correct oil flow,
• retention of the original hose routing, which minimizes the risk of abrasion and vibration.

Such compatibility facilitates installation and allows for maintaining the factory configuration of the transmission oil cooling system without the need for modifications.

Condition, service application, and benefits of installation

The offered item is in used condition, making it an attractive service solution for users looking for an economical yet original BMW part. Replacing the hose is particularly recommended when:

• signs of corrosion, cracking, or oil "sweating" are visible on the old hose,
• there are pressure drops in the transmission oil circuit,
• preventive replacement of cooling system components is necessary after a transmission repair.

Using an original hose from the same model group helps reduce the risk of leaks and ensures stable transmission operating conditions in the long term.

Technical support and knowledge about the cooling system

If you want to better understand how cooling affects the durability of the powertrain and transmission, it is worth checking out our guide on cooling system diagnostics and operation – see the article Engine cooling system – overheating, repair, and used radiators, which discusses practical aspects of how radiators and hoses work in BMW cars and other brands.

If you are interested in a broader approach to purchasing aftermarket parts and want to make informed choices when selecting used components, our guide to used parts will be helpful – check out the post Used parts – your guide to the best deals in an automotive store, where you will find practical tips on assessing the condition and cost-effectiveness of such solutions.

Expanding the oil cooling system in your BMW

If you are planning a comprehensive repair or upgrade of the oil cooling area in your BMW and need other elements from the same group, such as additional hoses, oil coolers, or connectors, check out the available parts in the BMW oil coolers and hoses category.