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BMW Coolant Expansion Tanks for BMW X Series G06 X6 (2020+)

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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Meistersatz CAP- EXPANSION TANK

T#:1195781

Part#: 17117639021

Ships in 3 Business Days

$ 30.99

This product was last offered at the strikethrough price on
07-07-2026

$ 29.99 USD

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$ 29.99 USD

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Rein Expansion Tank Cap

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

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

Intercooler Expansion Tank

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:584477

Part#: 17137647281

Ships in 3 Business Days

$ 71.99 USD

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$ 71.99 USD

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Rein Coolant Expansion Tank - F97 F98 G01 G02 G05 G06 G07 - S58 B46 B...

T#:55965843

Part#: 171386106612

Ships in 3 Business Days

$ 49.99 USD

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$ 49.99 USD

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Keep your ultimate driving machine cool under pressure with this replacement auxiliary expansion tank from Rein. On modern turbocharged BMWs, the secondary cooling system plays a critical role in managing intake charge air temperatures, making a solid reservoir vital for both spirited street driving and track day reliability.

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