Rein EPT0006 Engine Coolant Reservoir

OE Quality Expansion Tank for Mercedes-Benz

The Rein EPT0006 engine coolant reservoir is an OE-quality expansion tank built for Mercedes-Benz cooling systems that require a direct-fit replacement. It is produced from virgin plastic to help resist heat-cycle cracking and maintain durable, long-term performance.

Key Features

• Produced from virgin plastic meeting or exceeding OE material expectations
• Resists cracking and wear caused by repeated heat cycles to help reduce coolant loss
• Direct-fit design supports straightforward installation
• Manufactured to strict engineering standards for material quality and dimensional accuracy
• OE-style replacement for Mercedes-Benz S-Class cooling system service

Detailed Description

Rein EPT0006 is an application-specific engine coolant reservoir designed for select Mercedes-Benz models, including the S320, S420, S500, S600, 300SE, 400SE, 400SEL, 500SEC, 500SEL, 600SEC, and 600SEL. This expansion tank is built to match the fit and function expected in OE cooling system service, with materials selected to handle thermal cycling and everyday engine bay temperatures. For buyers searching for a Mercedes-Benz S320 expansion tank, Mercedes-Benz S500 coolant reservoir, or Mercedes-Benz S600 coolant reservoir, this part provides a direct replacement option.

This part cross-references URO 1405001749 for the same application.

What It Helps Fix

• Coolant leaks caused by a cracked or brittle reservoir
• Loss of coolant from heat-cycle damage in the plastic tank
• Warning lights or low-coolant conditions related to reservoir failure
• Cooling system service needs on aging Mercedes-Benz S-Class vehicles
• Fitment issues from worn or distorted original expansion tanks

Installation Notes and Tips

Verify vehicle fitment by year and VIN before installation. Some applications require expansion tank cap CPE0029P, and 1997 models have VIN-specific coverage: vehicles up to VIN A334377 require cap CPE0029P, while vehicles from VIN A334378 use the later configuration. Inspect the cooling system, hoses, and cap condition during replacement to help prevent repeat leaks.

Quality Assurance

Rein manufactures this expansion tank to strict engineering standards using virgin plastic rather than regrind material. That material choice supports durability, dimensional consistency, and resistance to cracking under repeated heat cycles.