Mini Cooper One R55 R56 R57 R58 Radiator Coolant Expansion Water Tank 7539267

Mini R55 R56 Expansion Tank is an original cooling system component from the Expansion Tanks category, designed for Mini R55 and R56 series models. This used OEM part ensures a factory fit, stable cooling system operation, and predictable engine performance across a wide range of loads. It's a practical solution for users seeking a proven part at a reasonable price, while maintaining the manufacturer's design parameters.

Specifications and technical data

• SKU: 7539267
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 7539267
• Substitutable numbers: 17137539267, 7539267, 17137823626, 7823626
• Category: Expansion & Overflow Tanks

Intended Use and Fitment for Mini R55 / R56

The Mini R55 R56 Expansion Tank has been specifically designed for the cooling system architecture of these Mini generations. This means correct port placement, appropriate housing geometry, and compatibility with factory hoses and mounting points.

This ensures a straightforward installation without the need for modifications to the existing system. The original design supports proper coolant circulation, which translates to stable engine operating temperatures and a reduced risk of overheating.

Technical Characteristics of the Expansion Tank

As an OEM Mini component, the expansion tank meets manufacturer requirements for pressure and temperature resistance within the typical operating range of the cooling system. The housing is designed for years of service in the engine bay, where it is exposed to variable thermal conditions and vibrations.

Key functional features:

• Factory fit for Mini R55 / R56 cooling systems,
• Maintains the original coolant flow path,
• Compatible with stock hoses and clamps,
• Design prepared for operation under elevated pressure conditions.

Additionally, the part has an assigned OEM number and related interchangeable numbers, which facilitates verification of compatibility with specific vehicle configurations and minimizes the risk of selecting the wrong part.

Condition, Origin, and Benefits of Choosing a Used Part

The presented tank is a used OEM part, meaning it comes from a dismantled Mini vehicle and retains the original manufacturer's specifications. In practice, this translates to proper alignment with adjacent components and predictable performance in operation.

Choosing a used Mini expansion tank is a beneficial solution for individuals who:

• Want to maintain the factory configuration of the cooling system,
• Are looking for a part with known compatibility for a specific body version,
• Prefer OEM components over aftermarket replacements of unknown origin.

This approach allows for reduced service costs while maintaining performance parameters close to factory standards.

Why Choose Original Mini Expansion Tanks

Original Mini Expansion Tanks are designed as an integral part of the entire cooling system, not as a universal replacement. This ensures:

• Stable system bleeding,
• Proper maintenance of coolant level,
• Compatibility with factory sensors and accessories (if present in the specific configuration),
• Adherence to the manufacturer's design specifications regarding durability and safety.

This is particularly important in vehicles where the cooling system operates at high temperatures and is crucial for engine reliability.

Selection and Technical Support

When selecting an expansion tank for the Mini R55 / R56, it is advisable to verify the OEM markings and interchangeable numbers visible in the technical specifications to confirm full compatibility with the specific engine version and year. If in doubt, comparing the shape and port layout with the currently installed part can be helpful.

If you are looking for other Mini Expansion Tanks, check the available variants in our category: Mini Expansion Tanks.

For users interested in a broader context of selecting components for the cooling and boost systems, we also recommend a practical guide: BMW B58 Code – Pre-Purchase Checklist for Turbochargers and Intercoolers for BMW 3 Series (G20), which demonstrates a methodical approach to verifying compatibility and technical condition of parts on the secondary market.