Rein BMW Coolant Expansion Tanks for BMW F85 X5 M S63 4.4L

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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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T#:384807
Part#: 17117639021
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Sale - Save 5% $ 16.99

This product was last offered at the strikethrough price on
06-29-2026

$ 16.14 USD
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 5%
$ 16.99

This product was last offered at the strikethrough price on
06-29-2026

$ 16.14 USD
Free Shipping on orders $49 and up
Add to Wish List
Cap for plastic expansion tank

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BMW Mini
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  • Expansion Tanks

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