Expansion Tank BMW E36 E38 E39 M50 M52 Petrol Cooling Water Coolant Tank 1723520

Expansion Tank BMW E36 E38 E39 M50 M52 Petrol Cooling Water Coolant Tank is a cooling system component designed for BMW cars with petrol engines, where stable operation of the power unit is crucial. A properly selected expansion tank ensures correct coolant circulation, maintains system pressure, and ensures a safe engine operating temperature.

Specifications and technical data

• SKU: 1723520
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 1723520
• Substitutable numbers: 1723520, 17111723520
• Fuel type: Petrol
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented expansion tank is a component from the Expansion Tanks group, responsible for compensating for changes in coolant volume during engine heating and cooling. A properly functioning tank allows for:

• maintaining a stable coolant level in the system,
• visual inspection of the fluid quantity and quick detection of any leaks,
• safe discharge of excess pressure from the cooling system,
• reducing the risk of engine overheating during intensive use.

For BMW M50 and M52 series petrol engines, the correct selection of the expansion tank has a direct impact on the thermal stability of the engine and the service life of other cooling system components.

Benefits of using an original BMW component

Using an original BMW expansion tank translates into a precise fit for factory mounts, connectors, and cooling system hoses. As a result:

• you minimize the risk of leaks at connections,
• you maintain the factory geometry of hose routing,
• you maintain compliance with the cooling system operating parameters specified by the manufacturer.

This solution is particularly recommended for servicing cars used on a daily basis, where consistent performance and predictable system behavior in various temperature conditions are important.

Performance characteristics and installation

As a used part, the expansion tank is a practical alternative to new parts, allowing for an economical repair while maintaining the original BMW design. A properly selected tank:

• enables efficient installation in place of the factory component,
• allows for maintaining the original routing of cooling hoses,
• promotes the maintenance of an even operating temperature for the petrol engine.

Such a solution is particularly beneficial for stage-by-stage restoration or servicing of older BMW models, where it is important to combine functionality with a reasonable budget.

Importance for the durability of BMW petrol engines

In BMW petrol engines, such as the M50 or M52, a stable operating temperature is crucial for the durability of seals, the cylinder head, and accessories. A functional expansion tank:

• facilitates bleeding the cooling system after fluid replacement,
• reduces the risk of local overheating in the cylinder head area,
• supports even distribution of fluid throughout the system.

Thanks to this, the cooling system operates in a more predictable manner, which translates into stable vehicle operation in city traffic and on the highway.

Expanding BMW cooling system service

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

During service work, it is also worth paying attention to other used components that affect the car's reliability in more difficult weather conditions – you can find practical tips and checklists in the article Winter essentials: which used car parts are worth checking and replacing before the frost?.