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

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$ 16.14 USD
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$ 16.99

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

$ 16.14 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
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T#:402160
Part#: 17137542986
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Sale - Save 5% $ 82.99

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$ 78.84 USD
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$ 82.99

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$ 78.84 USD
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Includes fluid level sensor
BMW Expansion Tank With Cap
BMW Expansion Tank With Cap
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T#:46616010
Part#: EPK0128
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Sale - Save 19% $ 86.99

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

$ 70.50 USD
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$ 86.99

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

$ 70.50 USD
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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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