Rein EPT0128 Engine Coolant Reservoir

OE Quality Expansion Tank for BMW Cooling Systems

The Rein EPT0128 engine coolant reservoir is an OE-quality expansion tank built for BMW cooling systems that need stable coolant storage and pressure management. It is made from virgin plastic to help resist heat-cycle cracking and maintain long-term durability in daily driving conditions.

Compatible with select 2004-2010 BMW 525i, 530i, 545i, 645Ci, 528i, 528i xDrive, 528xi, 535i, 535i xDrive, 535xi, 550i, 650i, 525xi, and 530xi applications, this Rein EPT0128 replacement is designed for direct fitment and consistent OE-style performance.

• Produced from virgin plastic meeting or exceeding OE material specifications
• Resists cracking and wear caused by repeated heat cycles
• Direct-fit design supports straightforward installation
• Built to strict engineering standards for materials and tolerances
• Black reservoir construction for OE-style appearance

Detailed Product Overview

Rein designs this expansion tank to match the fit, form, and function expected in BMW cooling system service. The reservoir helps maintain proper coolant volume as the engine heats and cools, while the virgin-plastic construction helps reduce the risk of premature failure associated with regrind materials. If you are replacing a leaking or aging BMW coolant reservoir, the Rein EPT0128 offers a practical OE-style solution.

This part cross-references Genuine 17137542986 and 17137519219 for the same application.

Common Cooling System Issues It Can Address

• Coolant loss from a cracked or split reservoir
• Visible plastic fatigue from repeated heat cycling
• Low coolant warnings caused by tank leakage
• Cooling system service needs on aging BMW 5 Series and 6 Series models
• Fitment problems from a reservoir that no longer matches OE dimensions

Installation Notes and Tips

Verify the reservoir shape, hose connections, and mounting points against the original tank before installation. Inspect related cooling system components such as hoses, caps, and level sensors during service so the replacement tank can perform properly after installation. Confirm application by vehicle year and model before ordering.

Quality Assurance

Rein manufactures this expansion tank to strict engineering standards using virgin plastic and OE-focused tolerances. The goal is durable service life, stable fitment, and performance aligned with original BMW cooling system requirements.