Rein EPT0013 Engine Coolant Reservoir

OE Quality Expansion Tank for BMW Cooling Systems

Rein EPT0013 is an OE-quality engine coolant reservoir built for BMW cooling system service. It is made from virgin plastic to help resist heat-cycle cracking and maintain a durable seal over long-term use.

Compatible with select BMW 540i, 740i, 740iL, 750iL, 840Ci, 850Ci, 850CSi, 850i, and Z8 applications, this expansion tank supports direct replacement service for aging or damaged coolant reservoirs.

Key Features

• Virgin plastic construction meets or exceeds OE material expectations
• Resists cracking and wear caused by repeated heat cycles
• Direct-fit design supports straightforward installation
• Built to strict engineering standards for material quality and tolerances
• Designed for long service life in BMW cooling systems

Detailed Description

The Rein EPT0013 expansion tank is engineered as an OE-style replacement for BMW coolant reservoir applications. Its virgin-plastic construction helps reduce the risk of premature cracking, which is a common failure point in older cooling systems exposed to repeated temperature changes. This makes it a practical choice for restoring proper coolant storage and pressure management in vehicles such as the BMW 540i, 740i, and 850Ci. This part number, EPT0013, is built to match the fit and function expected from the original component.

This part cross-references BMW 17111723071 and URO 17111741167 for the same application.

What It Helps Fix

• Coolant loss caused by a cracked reservoir
• Visible plastic aging or heat damage on the expansion tank
• Pressure-related cooling system leaks
• Overflow or low-coolant warning concerns tied to reservoir failure
• Replacement needs during BMW cooling system repair

Installation Notes and Tips

Verify the reservoir shape, hose connections, and mounting points against the original part before installation. EPT0013 is a direct-fit replacement, so it installs in place of the original expansion tank on the listed BMW applications without modification. Inspect related cooling system components, including hoses, caps, and clamps, during service to help prevent repeat leaks.

Quality Assurance

Rein manufactures this expansion tank to OE-quality standards using virgin plastic and controlled material tolerances. The design focuses on durability under heat cycling and consistent fitment for BMW cooling system repair.

• Fits 1997-2003 BMW 540i, N/A
• Fits 2003 BMW Z8, N/A
• Fits 1997-2001 BMW 740i, N/A
• Fits 1995 BMW 740i, N/A
• Fits 1995-2001 BMW 740iL, N/A
• Fits 1995-2001 BMW 750iL, N/A
• Fits 1994-1997 BMW 840Ci, N/A
• Fits 1993-1997 BMW 850Ci, N/A
• Fits 1994-1995 BMW 850CSi, N/A
• Fits 1991-1992 BMW 850i, N/A