Rein CPE0034 Engine Coolant Reservoir Cap - Radiator
OE Quality 60-Day Returns
Rein

Rein CPE0034 Engine Coolant Reservoir Cap - Radiator

Brand Rein CPE0034
Position Radiator
Application Type ApplicationSpecific
Container Type BG
Country of Origin DE
Item Height 2.7500
Item Length 3.7500
Item Level GTIN 843266070611
Item Qty 1
Item UOM EA
Item Weight 0.2350
Item Weight Unit UOM LB
Item Width 3.5000
Link to Manufacturer Page www.reinautomotive.com
Product Desc Extended 240 Rein OE Quality expansion tank caps are designed to be direct replacements for OE caps. Rein caps are designed to match or exceed the OE materials used and are produced to the highest standards to ensure long service life.
Product Desc Invoice 40 Rein Expansion Tank Cap
Product Desc Long 80 Rein OE Quality Expansion Tank Cap
Product Desc Short 20 Expansion Tank Cap
Fits BMW and Rolls-Royce · 334 vehicles

OE direct replacement. Direct fit cap keeps the cooling system at proper pressure.

OE-quality materials. Matches or exceeds OE materials for long service life.

Original equipment supplier. Produced to strict engineering standards and tolerances.

Cross-references URO 17137516004 and 17117639021 for the same application. See all 2.

$27.96Free shipping
In stock · usually ships same day before 1pm CST
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Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Engine Coolant Reservoir Cap options

OE-Quality Expansion Tank Cap

Rein CPE0034 is an OE-quality engine coolant reservoir cap built as a direct replacement for the factory cap. It helps maintain the cooling system pressure specified by the vehicle manufacturer, supporting stable coolant system operation on BMW and Rolls-Royce applications.

Use this expansion tank cap for BMW 750i xDrive, BMW M5, BMW X5, BMW X6, and related high-performance or luxury models that require a radiator-mounted cap. Rein CPE0034 is produced to match or exceed OE material and tolerance requirements for a precise fit.

  • Manufactured to strict engineering standards for materials and tolerances
  • Direct-fit replacement for the original expansion tank cap
  • Meets or exceeds OE pressure specifications
  • Produced by an original equipment supplier

Detailed Product Overview

Rein Automotive OE quality expansion tank caps are designed for drivers and technicians who need a reliable replacement for a worn, cracked, or pressure-weakening coolant reservoir cap. Part number CPE0034 is engineered to preserve the cooling system’s pressure balance, which is critical for proper coolant circulation and temperature control. This cap is a practical choice for BMW and Rolls-Royce vehicles where the cooling system depends on accurate pressure retention.

This part cross-references URO 17137516004 for the same application.

Common Cooling System Issues

  • Coolant loss from a cap that no longer seals correctly
  • Pressure-related cooling system warnings
  • Steam or odor from the expansion tank area
  • Inconsistent coolant system pressure during operation
  • Replacement after cap wear, cracking, or seal deterioration

Installation Notes

Verify the cap style, pressure rating, and application before installation. Clean the sealing surface on the expansion tank or radiator neck, then install the cap fully and confirm proper engagement. For BMW models such as the M3, M4, M5, X5, X6, and 750i xDrive, confirm the radiator or N/A application listed for your exact vehicle configuration. If the original cap shows signs of heat damage or seal wear, inspect the surrounding cooling system components at the same time.

Quality Assurance

Rein CPE0034 is manufactured to OE-quality standards and produced by an original equipment supplier. It is built to meet or exceed the pressure requirements specified by the OE manufacturer for dependable cooling system performance.

This part fits 334 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelLitersCylindersFuel TypePositionNotes
2026BMW760i xDrive—4.4LV8—Radiator—
2026BMWAlpina XB7—4.4LV8—Radiator—
2026BMWM2—3.0LL6—Radiator—
2026BMWM3—3.0LL6—Radiator—
2026BMWM4—3.0LL6—Radiator—
2026BMWM5—4.4LV8—Radiator—
2026BMWM5 Touring—4.4LV8—Radiator—
2026BMWM850i xDrive—4.4LV8—Radiator—
2026BMWM850i xDrive Gran Coupe—4.4LV8—Radiator—
2026BMWX5—4.4LV8—Radiator—
2026BMWX6—4.4LV8—Radiator—
2026BMWX7—4.4LV8—Radiator—
2026BMWXM—4.4LV8PLUG-IN HYBRID EV-GAS (PHEV)Radiator—
2026Rolls-RoyceCullinan—6.7LV12—Radiator—
2025BMW760i xDrive—4.4LV8—Radiator—
2025BMWAlpina B8 Gran Coupe—4.4LV8—Radiator—
2025BMWAlpina XB7—4.4LV8—Radiator—
2025BMWM2—3.0LL6—Radiator—
2025BMWM3—3.0LL6—Radiator—
2025BMWM4—3.0LL6—Radiator—
2025BMWM5—4.4LV8—Radiator—
2025BMWM5 Touring—4.4LV8—Radiator—
2025BMWM8—4.4LV8—Radiator—
2025BMWM8 Gran Coupe—4.4LV8—Radiator—
2025BMWM850i xDrive—4.4LV8—Radiator—
2025BMWM850i xDrive Gran Coupe—4.4LV8—Radiator—
2025BMWX5—4.4LV8—Radiator—
2025BMWX6—4.4LV8—Radiator—
2025BMWX7—4.4LV8—Radiator—
2025BMWXM—4.4LV8PLUG-IN HYBRID EV-GAS (PHEV)Radiator—
2025Rolls-RoyceCullinan—6.7LV12—Radiator—
2025Rolls-RoyceGhost—6.7LV12—Radiator—
2025Rolls-RoycePhantom—6.7LV12—Radiator—
2024BMW760i xDrive—4.4LV8—Radiator—
2024BMWAlpina B8 Gran Coupe—4.4LV8—Radiator—
2024BMWAlpina XB7—4.4LV8—Radiator—
2024BMWM2—3.0LL6—Radiator—
2024BMWM3—3.0LL6—Radiator—
2024BMWM4—3.0LL6—Radiator—
2024BMWM8—4.4LV8—Radiator—
2024BMWM8 Gran Coupe—4.4LV8—Radiator—
2024BMWM850i xDrive—4.4LV8—Radiator—
2024BMWM850i xDrive Gran Coupe—4.4LV8—Radiator—
2024BMWX5—4.4LV8—Radiator—
2024BMWX6—4.4LV8—Radiator—
2024BMWX7—4.4LV8—Radiator—
2024BMWXM—4.4LV8PLUG-IN HYBRID EV-GAS (PHEV)Radiator—
2024Rolls-RoyceCullinan—6.7LV12—Radiator—
2024Rolls-RoyceGhost—6.7LV12—Radiator—
2024Rolls-RoycePhantom—6.7LV12—Radiator—
2023BMW760i xDrive—4.4LV8—Radiator—
2023BMWAlpina B8 Gran Coupe—4.4LV8—Radiator—
2023BMWAlpina XB7—4.4LV8—Radiator—
2023BMWM2—3.0LL6—Radiator—
2023BMWM3—3.0LL6—Radiator—
2023BMWM4—3.0LL6—Radiator—
2023BMWM5—4.4LV8—Radiator—
2023BMWM550i xDrive—4.4LV8—Radiator—
2023BMWM760i xDrive—4.4LV8—Radiator—
2023BMWM8—4.4LV8—Radiator—
2023BMWM8 Gran Coupe—4.4LV8—Radiator—
2023BMWM850i xDrive—4.4LV8—Radiator—
2023BMWM850i xDrive Gran Coupe—4.4LV8—Radiator—
2023BMWX5—4.4LV8—Radiator—
2023BMWX6—4.4LV8—Radiator—
2023BMWX7—4.4LV8—Radiator—
2023BMWXM—4.4LV8PLUG-IN HYBRID EV-GAS (PHEV)Radiator—
2023Rolls-RoyceCullinan—6.7LV12—Radiator—
2023Rolls-RoyceGhost—6.7LV12—Radiator—
2023Rolls-RoycePhantom—6.7LV12—Radiator—
2022BMW750i xDrive—4.4LV8—Radiator—
2022BMW750Li xDrive—4.4LV8—Radiator—
2022BMWAlpina B8 Gran Coupe—4.4LV8—Radiator—
2022BMWAlpina XB7—4.4LV8—Radiator—
2022BMWM3—3.0LL6—Radiator—
2022BMWM4—3.0LL6—Radiator—
2022BMWM5—4.4LV8—Radiator—
2022BMWM550i xDrive—4.4LV8—Radiator—
2022BMWM760i xDrive—6.6LV12—Radiator—
2022BMWM760Li xDrive—6.6LV12—Radiator—
2022BMWM8—4.4LV8—Radiator—
2022BMWM8 Gran Coupe—4.4LV8—Radiator—
2022BMWM850i xDrive—4.4LV8—Radiator—
2022BMWM850i xDrive Gran Coupe—4.4LV8—Radiator—
2022BMWX5—4.4LV8—Radiator—
2022BMWX6—4.4LV8—Radiator—
2022BMWX7—4.4LV8—Radiator—
2022Rolls-RoyceCullinan—6.7LV12—Radiator—
2022Rolls-RoyceGhost—6.7LV12—Radiator—
2022Rolls-RoycePhantom—6.7LV12—Radiator—
2021BMW750i xDrive—4.4LV8—Radiator—
2021BMW750Li xDrive—4.4LV8—Radiator—
2021BMWAlpina XB7—4.4LV8—Radiator—
2021BMWM2—3.0LL6—Radiator—
2021BMWM3—3.0LL6—Radiator—
2021BMWM4—3.0LL6—Radiator—
2021BMWM5—4.4LV8—Radiator—
2021BMWM550i xDrive—4.4LV8—Radiator—
2021BMWM760i xDrive—6.6LV12—Radiator—
2021BMWM760Li xDrive—6.6LV12—Radiator—
2021BMWM8 Gran Coupe—4.4LV8—Radiator—
2021BMWM850i xDrive—4.4LV8—Radiator—
2021BMWM850i xDrive Gran Coupe—4.4LV8—Radiator—
2021BMWX5—4.4LV8—Radiator—
2021BMWX6—4.4LV8—Radiator—
2021BMWX7—4.4LV8—Radiator—
2021Rolls-RoyceCullinan—6.7LV12—Radiator—
2021Rolls-RoyceDawn—6.6LV12—Radiator—
2021Rolls-RoyceGhost—6.7LV12—Radiator—
2021Rolls-RoycePhantom—6.7LV12—Radiator—
2021Rolls-RoyceWraith—6.6LV12—Radiator—
2020BMW750i xDrive—4.4LV8—Radiator—
2020BMW750Li xDrive—4.4LV8—Radiator—
2020BMWM2—3.0LL6—Radiator—
2020BMWM4—3.0LL6—Radiator—
2020BMWM5—4.4LV8—Radiator—
2020BMWM550i xDrive—4.4LV8—Radiator—
2020BMWM760i xDrive—6.6LV12—Radiator—
2020BMWM760Li xDrive—6.6LV12—Radiator—
2020BMWM8—4.4LV8—Radiator—
2020BMWM8 Gran Coupe—4.4LV8—Radiator—
2020BMWM850i xDrive—4.4LV8—Radiator—
2020BMWM850i xDrive Gran Coupe—4.4LV8—Radiator—
2020BMWX5—4.4LV8—Radiator—
2020BMWX6—4.4LV8—Radiator—
2020BMWX7—4.4LV8—Radiator—
2020Rolls-RoyceCullinan—6.7LV12—Radiator—
2020Rolls-RoyceDawn—6.6LV12—Radiator—
2020Rolls-RoyceGhost—6.6LV12—Radiator—
2020Rolls-RoycePhantom—6.7LV12—Radiator—
2020Rolls-RoyceWraith—6.6LV12—Radiator—
2019BMW750i—4.4LV8—Radiator—
2019BMW750i xDrive—4.4LV8—Radiator—
2019BMW750Li—4.4LV8—Radiator—
2019BMW750Li xDrive—4.4LV8—Radiator—
2019BMWM2—3.0LL6—Radiator—
2019BMWM4—3.0LL6—Radiator—
2019BMWM5—4.4LV8—Radiator—
2019BMWM550i xDrive—4.4LV8—Radiator—
2019BMWM760i xDrive—6.6LV12—Radiator—
2019BMWM760Li xDrive—6.6LV12—Radiator—
2019BMWM850i xDrive—4.4LV8—Radiator—
2019BMWX5—4.4LV8—Radiator—
2019BMWX6M4.4LV8—Radiator—
2019BMWX7—4.4LV8—Radiator—
2019Rolls-RoyceCullinan—6.7LV12—Radiator—
2019Rolls-RoyceDawn—6.6LV12—Radiator—
2019Rolls-RoyceGhost—6.6LV12—Radiator—
2019Rolls-RoycePhantom—6.7LV12—Radiator—
2019Rolls-RoyceWraith—6.6LV12—Radiator—
2018BMW750i—4.4LV8—Radiator—
2018BMW750i xDrive—4.4LV8—Radiator—
2018BMW750Li—4.4LV8—Radiator—
2018BMW750Li xDrive—4.4LV8—Radiator—
2018BMWM3—3.0LL6—Radiator—
2018BMWM4—3.0LL6—Radiator—
2018BMWM5—4.4LV8—Radiator—
2018BMWM550i xDrive—4.4LV8—Radiator—
2018BMWM760i xDrive—6.6LV12—Radiator—
2018BMWM760Li xDrive—6.6LV12—Radiator—
2018BMWX5M4.4LV8—Radiator—
2018BMWX6M4.4LV8—Radiator—
2018Rolls-RoyceDawn—6.6LV12—Radiator—
2018Rolls-RoyceGhost—6.6LV12—Radiator—
2018Rolls-RoycePhantom—6.7LV12—Radiator—
2018Rolls-RoyceWraith—6.6LV12—Radiator—
2017BMW750i—4.4LV8—Radiator—
2017BMW750i xDrive—4.4LV8—Radiator—
2017BMW750Li—4.4LV8—Radiator—
2017BMW750Li xDrive—4.4LV8—Radiator—
2017BMWM3—3.0LL6—Radiator—
2017BMWM4—3.0LL6—Radiator—
2017BMWM760i xDrive—6.6LV12—Radiator—
2017BMWM760Li xDrive—6.6LV12—Radiator—
2017BMWX5M4.4LV8—Radiator—
2017BMWX6M4.4LV8—Radiator—
2017Rolls-RoyceDawn—6.6LV12—Radiator—
2017Rolls-RoyceGhost—6.6LV12—Radiator—
2017Rolls-RoyceWraith—6.6LV12—Radiator—
2016BMW750i—4.4LV8—Radiator—
2016BMW750i xDrive—4.4LV8—Radiator—
2016BMW750Li xDrive—4.4LV8—Radiator—
2016BMWM3—3.0LL6—Radiator—
2016BMWM4—3.0LL6—Radiator—
2016BMWX5M4.4LV8—Radiator—
2016BMWX6M4.4LV8—Radiator—
2016Rolls-RoyceDawn—6.6LV12—Radiator—
2016Rolls-RoyceGhost—6.6LV12—Radiator—
2016Rolls-RoyceWraith—6.6LV12—Radiator—
2015BMW760Li—6.0LV12—Radiator—
2015BMWM3—3.0LL6—Radiator—
2015BMWM4—3.0LL6—Radiator—
2015BMWX5M4.4LV8—Radiator—
2015BMWX6M4.4LV8—Radiator—
2015Rolls-RoyceGhost—6.6LV12—Radiator—
2015Rolls-RoyceWraith—6.6LV12—Radiator—
2014BMW760Li—6.0LV12—Radiator—
2014BMWX6—3.0LL6—N/A—
2014BMWX6—4.4LV8—Radiator—
2014Rolls-RoyceGhost—6.6LV12—Radiator—
2014Rolls-RoyceWraith—6.6LV12—Radiator—
2013BMW550i—4.4LV8—Radiator—
2013BMW550i xDrive—4.4LV8—Radiator—
2013BMW760Li—6.0LV12—Radiator—
2013BMWM3—4.0LV8—N/A—
2013BMWX5—3.0LL6GASN/A—
2013BMWX5—4.4LV8—Radiator—
2013BMWX6—3.0LL6—N/A—
2013BMWX6—4.4LV8—Radiator—
2013Rolls-RoyceGhost—6.6LV12—Radiator—
2012BMW535i—3.0LL6—N/ATo 3/12, w/2.0 Bar
2012BMW535i GT—3.0LL6—N/ATo 12/11, w/2.0 Bar
2012BMW535i GT xDrive—3.0LL6—N/ATo 12/11, w/2.0 Bar
2012BMW535i xDrive—3.0LL6—N/ATo 3/12, w/2.0 Bar
2012BMW550i—4.4LV8—Radiator—
2012BMW550i GT—4.4LV8—Radiator—
2012BMW550i GT xDrive—4.4LV8—Radiator—
2012BMW550i xDrive—4.4LV8—Radiator—
2012BMW640i—3.0LL6—N/ATo 3/12, w/2.0 Bar
2012BMW650i—4.4LV8—Radiator—
2012BMW650i xDrive—4.4LV8—Radiator—
2012BMW740i—3.0LL6—N/ATo 3/12, w/2.0 Bar
2012BMW740Li—3.0LL6—N/ATo 3/12, w/2.0 Bar
2012BMW750i—4.4LV8—Radiator—
2012BMW750i xDrive—4.4LV8—Radiator—
2012BMW750Li—4.4LV8—Radiator—
2012BMW750Li xDrive—4.4LV8—Radiator—
2012BMW760Li—6.0LV12—Radiator—
2012BMWActiveHybrid 5—3.0LL6—RadiatorTo 12/11, w/2.0 Bar
2012BMWM3—4.0LV8—N/A—
2012BMWX5—3.0LL6GASN/A—
2012BMWX5—4.4LV8—Radiator—
2012BMWX6—3.0LL6—N/A—
2012BMWX6—4.4LV8—Radiator—
2012Rolls-RoyceGhost—6.6LV12—Radiator—
2011BMW528i—3.0LL6—N/A—
2011BMW535i—3.0LL6—N/Aw/2.0 Bar
2011BMW535i GT—3.0LL6—N/Aw/2.0 Bar
2011BMW535i GT xDrive—3.0LL6—N/Aw/2.0 Bar
2011BMW535i xDrive—3.0LL6—N/Aw/2.0 Bar
2011BMW550i—4.4LV8—Radiator—
2011BMW550i GT—4.4LV8—Radiator—
2011BMW550i GT xDrive—4.4LV8—Radiator—
2011BMW550i xDrive—4.4LV8—Radiator—
2011BMW740i—3.0LL6—N/Aw/2.0 Bar
2011BMW740Li—3.0LL6—N/Aw/2.0 Bar
2011BMW750i—4.4LV8—Radiator—
2011BMW750i xDrive—4.4LV8—Radiator—
2011BMW750Li—4.4LV8—Radiator—
2011BMW750Li xDrive—4.4LV8—Radiator—
2011BMW760Li—6.0LV12—Radiator—
2011BMWM3—4.0LV8—N/A—
2011BMWX5—3.0LL6GASN/A—
2011BMWX5—4.4LV8—Radiator—
2011BMWX6—3.0LL6—N/A—
2011BMWX6—4.4LV8—Radiator—
2011Rolls-RoyceGhost—6.6LV12—Radiator—
2010BMW528i—3.0LL6—N/A—
2010BMW528i xDrive—3.0LL6—N/A—
2010BMW535i—3.0LL6—N/A—
2010BMW535i GT—3.0LL6—N/Aw/2.0 Bar
2010BMW535i xDrive—3.0LL6—N/A—
2010BMW550i—4.8LV8—N/A—
2010BMW550i GT—4.4LV8—Radiator—
2010BMW550i GT xDrive—4.4LV8—Radiator—
2010BMW650i—4.8LV8—N/A—
2010BMW750i—4.4LV8—Radiator—
2010BMW750i xDrive—4.4LV8—Radiator—
2010BMW750Li—4.4LV8—Radiator—
2010BMW750Li xDrive—4.4LV8—Radiator—
2010BMW760Li—6.0LV12—Radiator—
2010BMWM3—4.0LV8—N/A—
2010BMWM5—5.0LV10—N/A—
2010BMWM6—5.0LV10—N/A—
2010BMWX5—3.0LL6GASN/A—
2010BMWX5—4.4LV8—Radiator—
2010BMWX5—4.8LV8—N/A—
2010BMWX6—3.0LL6—N/A—
2010BMWX6—4.4LV8—Radiator—
2010Rolls-RoyceGhost—6.6LV12—Radiator—
2009BMW528i—3.0LL6—N/A—
2009BMW528i xDrive—3.0LL6—N/A—
2009BMW535i—3.0LL6—N/A—
2009BMW535i xDrive—3.0LL6—N/A—
2009BMW550i—4.8LV8—N/A—
2009BMW650i—4.8LV8—N/A—
2009BMW750i—4.4LV8—Radiator—
2009BMW750Li—4.4LV8—Radiator—
2009BMWM3—4.0LV8—N/A—
2009BMWM5—5.0LV10—N/A—
2009BMWM6—5.0LV10—N/A—
2009BMWX5—3.0LL6GASN/A—
2009BMWX5—4.8LV8—N/A—
2009BMWX6—3.0LL6—N/A—
2009BMWX6—4.4LV8—Radiator—
2008BMW528i—3.0LL6—N/A—
2008BMW528xi—3.0LL6—N/A—
2008BMW535i—3.0LL6—N/A—
2008BMW535xi—3.0LL6—N/A—
2008BMW550i—4.8LV8—N/A—
2008BMW650i—4.8LV8—N/A—
2008BMWM3—4.0LV8—N/A—
2008BMWM5—5.0LV10—N/A—
2008BMWM6—5.0LV10—N/A—
2008BMWX5—3.0LL6—N/A—
2008BMWX5—4.8LV8—N/A—
2008BMWX6—3.0LL6—N/A—
2008BMWX6—4.4LV8—Radiator—
2007BMW525i—3.0LL6—N/A—
2007BMW525xi—3.0LL6—N/A—
2007BMW530i—3.0LL6—N/A—
2007BMW530xi—3.0LL6—N/A—
2007BMW550i—4.8LV8—N/A—
2007BMW650i—4.8LV8—N/A—
2007BMWM5—5.0LV10—N/A—
2007BMWM6—5.0LV10—N/A—
2007BMWX5—3.0LL6—N/A—
2007BMWX5—4.8LV8—N/A—
2006BMW525i—3.0LL6—N/A—
2006BMW525xi—3.0LL6—N/A—
2006BMW530i—3.0LL6—N/A—
2006BMW530xi—3.0LL6—N/A—
2006BMW550i—4.8LV8—N/A—
2006BMW650i—4.8LV8—N/A—
2006BMWM5—5.0LV10—N/A—
2006BMWM6—5.0LV10—N/A—
2005BMW525i—2.5LL6—N/A—
2005BMW530i—3.0LL6—N/A—
2005BMW545i—4.4LV8—N/A—
2005BMW645Ci—4.4LV8—N/A—
2004BMW525i—2.5LL6—N/A—
2004BMW530i—3.0LL6—N/A—
2004BMW545i—4.4LV8—N/A—
2004BMW645Ci—4.4LV8—N/A—
Directly replaces or cross-references 2 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
URO — 1713751600417117639021