Rein EPT0025 Engine Coolant Reservoir

OE Quality Expansion Tank for BMW Cooling Systems

Rein EPT0025 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 stable coolant level in daily driving.

Compatible With 1999-2003 BMW Z3 and 2000-2003 BMW X5 applications, this expansion tank is a direct-fit replacement for common coolant reservoir service needs. Rein EPT0025 is engineered to match OE materials and tolerances for straightforward installation.

Key Features

• Produced from virgin plastic meeting or exceeding OE specifications
• Resists cracking and wear from repeated heat cycles to help prevent coolant loss
• Direct fitment supports easier installation
• Manufactured to strict engineering standards for materials and tolerances
• OE quality construction for long service life

Detailed Product Overview

The Rein EPT0025 expansion tank is designed as a replacement coolant reservoir for BMW vehicles that require an application-specific fit. It is built from virgin plastic with no regrind, which helps improve durability in high-temperature cooling system environments. This part cross-references BMW OE numbers 17107503769 and 17111705613 for the same application.

Fits 2000-2003 BMW X5, N/A. Fits 2001-2002 BMW Z3, N/A. Fits 2000 BMW Z3, N/A, to 7/99, requires expansion tank inlet hose CHE0273P. Fits 2000 BMW Z3, N/A, from 7/99. Fits 1999 BMW Z3, N/A, requires expansion tank inlet hose CHE0273P. Fits 1999 BMW Z3, N/A, from 9/98, requires expansion tank inlet hose CHE0273P.

Common Cooling System Issues

• Cracked coolant reservoir causing coolant loss
• Heat-cycle damage in aging plastic expansion tanks
• Leaking reservoir seams or fittings
• Unstable coolant level from a damaged tank
• Replacement needed after OE tank wear

Installation Notes

Verify the vehicle build date and note requirements before installation, especially for 1999-2000 BMW Z3 applications. Some listed fitments require expansion tank inlet hose CHE0273P. Confirm hose routing, mounting points, and coolant connections before refilling the system.

Quality Assurance

Rein designs OE quality expansion tanks to meet strict material and dimensional standards. The use of virgin plastic helps improve durability under repeated thermal cycling. Warranty coverage is 24 months or 24,000 miles.