BMW E46 M3 Coolant Expansion Tank Bottle Reservoir Fluid 2283344

The BMW E46 M3 Expansion Tank is an original cooling system component from the Expansion Tanks category, designed for the sporty version of the BMW 3 Series E46 M3. This used OEM part ensures proper pressure and stable operation of the cooling system, contributing to safe engine operation under demanding road and track conditions.

Specifications and technical data

• SKU: 2283344
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 2283344
• Substitutable numbers: 17112283344, 2283344, 17112228944, 2228944, EM
• Category: Expansion & Overflow Tanks

Purpose and Function in the Cooling System

The expansion tank in the BMW E46 M3 is responsible for compensating for changes in coolant volume and maintaining stable pressure throughout the system. A correctly selected component:

• ensures the proper coolant level under all engine operating conditions,
• stabilizes pressure in the cooling system,
• reduces the risk of engine overheating,
• supports even fluid circulation throughout the circuit.

Thanks to this, the BMW E46 M3 expansion tank is a key element for maintaining the correct engine operating temperature, especially in dynamically driven vehicles.

Original Origin and Interchangeable Numbers

The presented tank comes from the BMW OE line, meaning it is factory-fitted for the E46 M3 cooling system. The original component has an assigned OEM part number and a set of interchangeable numbers, which facilitates unambiguous identification and selection for a specific vehicle configuration. The presence of reference numbers allows verification of compatibility with the manufacturer's catalog and avoids installation issues.

Condition, Verification, and Preparation for Installation

The item is offered as a used BMW expansion tank, allowing for economical repair of the cooling system while maintaining original specifications. Before being offered, the component is verified for leaks and overall suitability for installation, so it can be used as a replacement for a damaged tank in the customer's vehicle.

The original OEM design allows for installation in place of the factory part without the need for modifications to the installation, hoses, or mounting points. This solution is particularly beneficial for workshops aiming to reduce repair time and maintain compliance with factory manufacturer standards.

Benefits of Using an Original Expansion Tank

Choosing this expansion tank model for the BMW E46 M3 offers a range of practical benefits:

• Factory Fit – compatibility with the E46 M3 cooling system, without issues with installation or connection leaks.
• Consistency with Service Documentation – easy identification by OEM part number and interchangeable numbers.
• Economical Repair – a used OEM part helps reduce costs compared to a new component while maintaining original specifications.
• Stable Cooling System Operation – a correctly selected tank supports maintaining the correct engine temperature.

Related Products and Technical Knowledge

If you need other BMW expansion tanks for various models of this brand, check out our dedicated category: BMW expansion tanks. This will allow you to easily compare available variants and select the right part for your specific model.

Want to better understand how the availability of used OEM parts affects repair time and workshop workflow? Read the article: Availability of Car Parts Off-the-Shelf vs. Repair Time – How Used OEM Parts Shorten Workshop Stays?, where you will find practical tips for optimizing the service process.