Rein EPK0134 Engine Coolant Reservoir Kit

OE Quality Expansion Tank Kit

The Rein EPK0134 engine coolant reservoir kit is an OE-quality replacement for select Mercedes-Benz S-Class applications. It is built to match the original tank’s fit and function, with materials chosen for durability through repeated heat cycles and everyday cooling-system demands.

Compatible with 2014-2017 Mercedes-Benz S550, 2015-2017 Mercedes-Benz S600, 2015-2020 Mercedes-Benz S65 AMG, 2016-2017 Mercedes-Benz Maybach S600, 2017 Mercedes-Benz Maybach S550, 2018-2021 Mercedes-Benz S560, 2018-2020 Mercedes-Benz Maybach S560, and 2018-2020 Mercedes-Benz Maybach S650.

• Includes sensor, if applicable, and expansion tank cap

• Produced from virgin plastic to meet or exceed OE material specifications

• Resists cracking and wear caused by heat cycles

• Direct-fit design supports straightforward installation

• Built for long service life in the cooling system

Detailed Product Overview

Rein EPK0134 is an application-specific coolant reservoir kit designed for Mercedes-Benz S-Class and Maybach models that require a precise OE-style expansion tank replacement. The tank is manufactured from virgin plastic with no regrind, helping maintain structural integrity and reducing the risk of cracking over time. This helps preserve coolant level stability and supports proper cooling-system operation. The kit also includes the cap and sensor, if applicable, so the replacement matches the original reservoir assembly more closely. This part cross-references URO 2225000849 for the same application.

Common Cooling-System Issues Addressed

• Cracked or brittle coolant reservoir housing

• Coolant loss from heat-cycle damage

• Faulty reservoir sensor on equipped applications

• Worn or leaking expansion tank cap

• Fitment problems from non-OE-style replacement tanks

Installation Notes

Before installation, verify the vehicle’s existing reservoir configuration and sensor setup against the original part. Inspect hoses, clamps, and surrounding cooling-system components for wear or residue before installing the new tank. After installation, refill and bleed the cooling system according to factory service procedures to help prevent air pockets and ensure proper coolant circulation. Fits 2014-2017 Mercedes-Benz S550, 2015-2017 Mercedes-Benz S600, 2015-2020 Mercedes-Benz S65 AMG, 2016-2017 Mercedes-Benz Maybach S600, 2017 Mercedes-Benz Maybach S550, 2018-2021 Mercedes-Benz S560, 2018-2020 Mercedes-Benz Maybach S560, and 2018-2020 Mercedes-Benz Maybach S650.