BMW Coolant Expansion Tanks for BMW 5 Series E61 (2006-2010)

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On certain models, namely E36, E46, and E90, the factory BMW expansion tank is prone to either breaking at connection points or blowing apart altogether. If you're starting to feel like your expansion tank is on borrowed time, it's probably time to replace with either a direct OE replacement, or strengthen your cooling setup with an aluminum expansion tank - we offer numerous performance upgrades for your expansion tank. Especially if you're someone who likes to track your BMW, we recommend upgrading your expansion tank to avoid ruining your track day.
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Rein Expansion Tank Cap
Rein Expansion Tank Cap
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Rein - Corporate Logo
T#:384807
Part#: 17117639021
In Stock
$ 16.99 USD
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$ 16.99 USD
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Cap for plastic expansion tank
Rein Coolant Expansion Tank - E60, E61, E63, E64
Rein Coolant Expansion Tank - E60, E61, E63, E64
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Rein - Corporate Logo
T#:402160
Part#: 17137542986
Ships in 1 Business Day
$ 82.99 USD
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$ 82.99 USD
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Includes fluid level sensor
Fluid Level Sensor
Fluid Level Sensor
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Meyle - Corporate Logo
T#:5973204
Part#: 17117546548
Special Order: No Guaranteed ETA
$ 13.99 USD
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$ 13.99 USD
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MEYLE-ORIGINAL: True to OE fluid level sensor. Used in multiple locations. Wulf Gaertner Autoparts AG manufactures and markets automotive spare parts under its MEYLE brand. Since its foundation in 1958, Wulf Gaertner Autoparts has been an owner-operated, unlisted family business on the aftermarket scene. Since 1995, Wulf Gaertner Autoparts AG has been manufacturing and trading under its MEYLE brand. They pride themselves on top-grade quality-tested spare parts for passenger cars, vans and commercial vehicles. Comparable OE Cross Reference - 17117546548
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BMW Expansion Tank With Cap
BMW Expansion Tank With Cap
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Rein - Corporate Logo
T#:46616010
Part#: EPK0128
Ships in 3 Business Days
$ 86.99

This product was last offered at the strikethrough price on
04-28-2026

$ 74.99 USD
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$ 74.99 USD
Free Shipping on orders $49 and up
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The coolant expansion tank acts as a reservoir for excess coolant as it expands and contracts with temperature changes. Over time, the constant exposure to extreme heat cycles can cause the tank to crack, break, or suffer damage to its nipples or mounting points. To keep coolant properly contained within the system, a damaged tank should be replaced promptly.
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