Rein EPT0235 Engine Coolant Reservoir - Radiator

OE-Style Coolant Reservoir for BMW

The Rein EPT0235 engine coolant reservoir is an OE-quality expansion tank built for BMW cooling systems that use a radiator-mounted reservoir without a cap. It is molded from virgin plastic to help resist heat-cycle cracking and maintain long-term durability.

• OE-quality engine coolant reservoir for radiator-mounted applications
• Plastic construction in black finish
• Virgin plastic material with no regrind
• Mounting brackets included for installation support
• Twist-on cap design; cap not included
• Cross-reference: URO 17138677649

Fitment Details

Compatible with BMW 230i, 230i xDrive, M240i, M240i xDrive, 430i, 430i Gran Coupe, 430i xDrive, 430i xDrive Gran Coupe, 440i, 440i Gran Coupe, 440i xDrive, 440i xDrive Gran Coupe, 330i GT xDrive, 330i xDrive, 340i GT xDrive, 330i, 340i, and 340i xDrive radiator applications. Fits 2016-2021 BMW 230i, radiator; fits 2016-2021 BMW 230i xDrive, radiator; fits 2016-2021 BMW M240i, radiator; fits 2016-2021 BMW M240i xDrive, radiator; fits 2017-2020 BMW 430i, radiator; fits 2017-2020 BMW 430i Gran Coupe, radiator; fits 2017-2020 BMW 430i xDrive, radiator; fits 2017-2020 BMW 430i xDrive Gran Coupe, radiator; fits 2017-2020 BMW 440i, radiator; fits 2017-2020 BMW 440i Gran Coupe, radiator; fits 2017-2020 BMW 440i xDrive, radiator; fits 2017-2020 BMW 440i xDrive Gran Coupe, radiator; fits 2017-2019 BMW 330i GT xDrive, radiator; fits 2017-2019 BMW 330i xDrive, radiator; fits 2017-2019 BMW 340i GT xDrive, radiator; fits 2017-2018 BMW 330i, radiator; fits 2016-2018 BMW 340i, radiator; fits 2016-2018 BMW 340i xDrive, radiator.

What It Helps Address

• Cracked or brittle coolant reservoir housing
• Coolant loss from a damaged expansion tank
• Heat-cycle wear in aging BMW cooling systems
• Reservoir replacement after leak diagnosis
• Restoration of proper coolant expansion capacity

Installation Notes

Verify the vehicle uses a radiator-mounted reservoir with a twist-on cap design and no cap included with the replacement tank. Transfer or source the correct cap separately if needed, and inspect hoses, seals, and mounting points before installation. Confirm fitment by year, model, and cooling-system configuration before ordering.

Quality Assurance

Rein designs this expansion tank to match OE materials and fitment expectations for BMW cooling-system service. The virgin-plastic construction is selected to improve durability in repeated heat cycles and support long service life in daily-use applications.