BMW F20 F21 F30 F32 1 Radiator Expansion Overflow Reservoir Tank Bottle 7642160

Visual condition of the part 

The product shows signs of use visible in the photos. 

BMW F20 F21 F30 F32 1 Radiator Expansion Overflow Reservoir Tank Bottle is an original cooling system component from the Expansion tanks category, designed for use in popular F-series models. Thanks to its factory design, it ensures the proper operation of the coolant circulation, pressure stabilization, and safe discharge of excess fluid during engine operation.

Specifications and technical data

• SKU: 7642160-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7642160
• Substitutable numbers: 7642160, 17137642160, 17137609468, 7609468
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented expansion tank is responsible for compensating for changes in coolant volume resulting from temperature fluctuations during engine operation. A properly selected component of this type helps maintain stable pressure in the system, reduces the risk of overheating, and facilitates coolant level monitoring in the engine bay.

Due to its design, which complies with BMW factory standards, the tank works with original connectors, hoses, and sensors, which translates into predictable cooling system behavior and easier diagnostics of potential leaks.

Benefits of using an original BMW tank

Using an original expansion tank in BMW F-series cars allows for maintaining cooling system performance parameters in accordance with the manufacturer's specifications. This is particularly important in modern engines, where operating temperature and fluid pressure are precisely controlled by the vehicle's electronics.

• Factory fitment to mounts and accessories in the engine bay, without the need for modifications.
• Consistency with the original geometry of the cooling hoses, which reduces stress and potential leaks.
• Easier fluid level monitoring thanks to the retention of the original tank design.

Choosing an original element from the Expansion tanks category is particularly beneficial in premium class cars, where engine thermal stability directly affects component durability and driving comfort.

Characteristics of the used component

The offered tank comes from disassembly and is a used part, which represents a reasonable compromise between repair costs and maintaining original build quality. This type of component is a good choice in situations where the existing tank has cracked, deformed, or shows signs of leaks at the connection ports.

In practice, installing a used, original expansion tank allows for restoring the proper operation of the cooling system without the need to resort to replacements with uncertain material specifications.

Selection support and additional information

The element has assigned factory markings and interchangeable numbers, which facilitates verification of compatibility with a specific vehicle configuration. In case of doubt during selection, it is worth comparing the shape, arrangement of the ports, and mounting method with the tank currently installed in the car.

If you are planning a comprehensive repair or upgrade of the cooling system area in your BMW and need other elements from the same group, such as additional tanks, mounting elements, or related components, check the available parts in the BMW Expansion tanks category.

To better understand why original used components for premium brands are increasingly chosen by conscious drivers, it is worth reading the article Crisis in the new parts market? Why used originals for premium cars are the hottest trend in 2026, which discusses the current market situation and the benefits of such an approach to repairs.