Rein BMW Coolant Expansion Tanks for BMW 1 Series E82 (2008-2013)

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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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BMW E9X Z4 E8X Coolant Expansion Tank
BMW E9X Z4 E8X Coolant Expansion Tank
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T#:402142
Part#: 17137640514
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$ 66.83 USD
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Includes level sensor
Coolant Expansion Tank
Coolant Expansion Tank
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T#:592020
Part#: 17137640515
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Sale - Save 5% $ 97.99

This product was last offered at the strikethrough price on
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$ 93.09 USD
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$ 97.99

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$ 93.09 USD
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Includes level sensor
BMW Coolant Expansion Tank With Cap
BMW Coolant Expansion Tank With Cap
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T#:46616007
Part#: EPK0131
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Sale - Save 5% $ 104.99

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

$ 99.29 USD
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$ 104.99

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

$ 99.29 USD
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The coolant expansion tank provides a place for excess coolant to flow as temperatures rise and fall. Because it constantly endures extreme temperature changes, it’s prone to cracking or breaking over time. Keeping coolant contained within the system is essential, so if your tank shows signs of damage—such as cracks, broken nipples, or compromised mounting points—it’s time for a replacement.
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