Rein EPT0028 Engine Coolant Reservoir

OE Quality Expansion Tank for BMW Cooling Systems

The Rein EPT0028 engine coolant reservoir is an OE-quality expansion tank built for BMW cooling systems that need stable coolant storage and reliable heat-cycle durability. It is produced from virgin plastic to help resist cracking and maintain a long service life in demanding under-hood conditions.

Fits 2006-2011 BMW 323i, N/A; Fits 2006 BMW 325i, N/A; Fits 2006 BMW 325xi, N/A; Fits 2006-2006 BMW 330i, N/A; Fits 2006 BMW 330xi, N/A; Fits 2007-2013 BMW 328i, N/A; Fits 2007-2008 BMW 328xi, N/A; Fits 2007-2013 BMW 335i, N/A; Fits 2007-2008 BMW 335xi, N/A; Fits 2008-2010 BMW 135i, N/A; Fits 2008-2013 BMW 128i, N/A; Fits 2009-2013 BMW 328i xDrive, N/A; Fits 2009-2010 BMW 335i xDrive, N/A; Fits 2009-2016 BMW Z4, N/A; Fits 2011 BMW 1 Series M, N/A; Fits 2011-2013 BMW 335is, N/A; Fits 2012-2015 BMW X1, N/A.

• Virgin plastic construction meets or exceeds OE material expectations
• Resists cracking and wear from repeated heat cycles
• Direct-fit design supports straightforward installation
• Built to strict engineering standards for material and dimensional accuracy
• OE-style replacement for BMW coolant reservoir service

Detailed Product Overview

Rein EPT0028 is an OE-quality expansion tank designed to restore proper coolant reservoir function in BMW 128i, 328i, 335i, Z4, X1, and related applications. The tank is manufactured from virgin plastic with no regrind, which helps improve durability and reduce the risk of failure caused by thermal cycling. For drivers searching for a BMW coolant reservoir, BMW expansion tank, or Rein EPT0028 replacement, this part provides a direct-fit solution for the listed vehicles.

This part cross-references BMW (e.g., 17137519368, 17137543026) for the same application.

Common Problems This Part Helps Address

• Coolant loss from a cracked expansion tank
• Reservoir damage caused by repeated engine heat cycles
• Cooling system service needs on aging BMW models
• Fitment issues from non-OE-style replacement tanks
• Plastic fatigue in high-temperature engine bay conditions

Installation Notes and Tips

Verify the part number and vehicle application before installation. Inspect the surrounding cooling system components, including hoses, caps, and mounting points, so the new reservoir is installed into a clean and leak-free system. After installation, refill and bleed the cooling system according to BMW service procedures to remove trapped air.

Quality Assurance

Rein manufactures this expansion tank to OE-quality material and tolerance standards. The use of virgin plastic and application-specific engineering supports consistent fitment and long-term durability in BMW cooling system service.