Rein EPT0003 Engine Coolant Reservoir

OE Quality Expansion Tank for Mercedes-Benz Cooling Systems

Rein EPT0003 is an OE-quality engine coolant reservoir built for Mercedes-Benz applications that need reliable coolant expansion and recovery. It is made from virgin plastic to help resist heat-cycle cracking and maintain long-term durability in the cooling system.

Fits 2007-2014 Mercedes-Benz CL550, N/A; Fits 2007-2014 Mercedes-Benz CL600, N/A; Fits 2008-2014 Mercedes-Benz CL63 AMG, N/A; Fits 2008-2014 Mercedes-Benz CL65 AMG, N/A; Fits 2012-2013 Mercedes-Benz S350, N/A; Fits 2007-2013 Mercedes-Benz S550, N/A; Fits 2007-2013 Mercedes-Benz S600, N/A; Fits 2008-2013 Mercedes-Benz S63 AMG, N/A; Fits 2007-2013 Mercedes-Benz S65 AMG, N/A; Fits 2008-2011 Mercedes-Benz S450, N/A.

• Produced from virgin plastic to meet or exceed OE material specifications
• Resists cracking and wear from repeated heat cycles to help prevent coolant loss
• Direct-fit design supports straightforward installation
• Built to strict engineering standards for material quality and dimensional accuracy
• OE-style replacement for cooling system service on Mercedes-Benz CL-Class and S-Class models

Detailed Product Overview

This Rein expansion tank is engineered as a direct replacement for the original coolant reservoir used in select Mercedes-Benz CL550, CL600, CL63 AMG, CL65 AMG, S350, S450, S550, S600, S63 AMG, and S65 AMG models. Part number EPT0003 is manufactured to match OE fit and performance expectations, with attention to material durability and tolerance control. Rein EPT0003 is a practical choice when replacing a cracked or aging coolant reservoir on Mercedes-Benz cooling systems.

Common Cooling System Issues It Can Address

• Coolant leaks caused by reservoir cracking
• Loss of coolant from heat-cycle fatigue in the expansion tank
• Visible plastic deterioration or brittleness around the reservoir
• Cooling system service needs on aging Mercedes-Benz CL-Class and S-Class vehicles
• Fitment problems from worn or distorted OE-style tanks

Installation Notes and Tips

Verify vehicle fitment by year and model before installation. Inspect connected hoses, caps, and mounting points for wear or damage during replacement. Because this is an application-specific part, confirm the original reservoir shape and connection layout match the vehicle before final installation.

Quality Assurance

Rein designs OE-quality expansion tanks to install, fit, and perform like the original component. The use of virgin plastic and controlled manufacturing standards supports durability in high-temperature cooling system service. This part cross-references Genuine 2215000349 for the same application.