OE Quality
60-Day Returns

Rein EPT0138 Engine Coolant Reservoir
Overview of Rein Engine Coolant Reservoir EPT0138
The Rein Engine Coolant Reservoir, part number EPT0138, is designed specifically for BMW and Land Rover vehicles, including the Range Rover and X5 models. This application-specific expansion tank ensures reliable coolant management under demanding engine conditions.
Key Features of Rein Engine Coolant Reservoir
- Manufactured from virgin plastic that meets or exceeds original equipment specifications
- Resistant to cracking and wear caused by repeated heat cycles, preventing coolant leaks
- Direct fitment design allows for straightforward installation without modifications
- Produced under strict engineering standards to maintain durability and performance
- Compact dimensions: 10.62 inches length, 8.66 inches width, and 7.08 inches height
- Lightweight construction at approximately 2.14 pounds
Detailed Product Description
The Rein EPT0138 engine coolant reservoir is engineered to handle the thermal stresses typical in BMW and Land Rover engines, particularly for Range Rover and X5 models. Constructed from high-quality virgin plastic, this expansion tank resists cracking and degradation from heat cycles, which helps maintain the integrity of the cooling system. Its direct fitment design ensures compatibility and ease of installation, reducing downtime during replacement. Manufactured in China under stringent quality controls, this reservoir aligns with OE standards to provide consistent performance and reliability.
Common Applications and Issues Addressed
- Replacement of cracked or leaking coolant reservoirs in BMW X5 and Land Rover Range Rover vehicles
- Prevention of coolant loss due to wear from heat cycling
- Restoration of proper coolant expansion and overflow management
- Resolution of overheating issues related to faulty or damaged expansion tanks
- Maintaining system pressure and preventing air intrusion into the cooling system
Installation Notes and Tips
- Ensure the engine is cool before removing the old coolant reservoir to avoid injury
- Verify compatibility with your specific BMW or Land Rover model and year before installation
- Use OEM or equivalent coolant when refilling the system after installation
- Inspect hoses and clamps for wear and replace if necessary during installation
- Follow vehicle manufacturer torque specifications when securing the reservoir
Quality Assurance and Warranty Information
Rein engine coolant reservoirs are manufactured to meet or exceed original equipment standards, ensuring durability and reliable performance. While specific warranty details may vary, Rein products typically come with a limited warranty covering defects in materials and workmanship. This provides assurance that the EPT0138 reservoir will perform as intended in BMW and Land Rover cooling systems.
| Brand | Rein |
| Part Number | EPT0138 |
| Application Type | ApplicationSpecific |
| Container Type | BX |
| Country of Origin | CN |
| Item Height | 7.0800 |
| Item Length | 10.6200 |
| Item Level GTIN | 843266080078 |
| Item Qty | 1 |
| Item UOM | EA |
| Item Weight | 2.1400 |
| Item Weight Unit UOM | LB |
| Item Width | 8.6600 |
| Link to Manufacturer Page | www.reinautomotive.com |
| Product Desc Extended 240 | Rein OE quality expansion tanks are designed to handle heat cycles and resist cracking. These tanks are produced from virgin plastic with no regrind to ensure the plastic is durable and will have a long service life. |
| Product Desc Invoice 40 | Rein Expansion Tank |
| Product Desc Long 80 | Rein OE Quality Expansion Tank |
| Product Desc Short 20 | Expansion Tank |
This part fits 9 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2006 | BMW | X5 | 4.4L | V8 | N/A | |
| 2006 | BMW | X5 | 4.8L | V8 | N/A | |
| 2005 | BMW | X5 | 4.4L | V8 | N/A | |
| 2005 | BMW | X5 | 4.8L | V8 | N/A | |
| 2005 | Land Rover | Range Rover | 4.4L | V8 | N/A | |
| 2004 | BMW | X5 | 4.4L | V8 | N/A | |
| 2004 | BMW | X5 | 4.8L | V8 | N/A | |
| 2004 | Land Rover | Range Rover | 4.4L | V8 | N/A | |
| 2003 | Land Rover | Range Rover | 4.4L | V8 | N/A |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.