Rein BMW Coolant Expansion Tanks for BMW 5 Series G30 (2017+)

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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
$ 14.99 USD
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$ 14.99 USD
Free Shipping on orders $49 and up
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Cap for plastic expansion tank
Intercooler Expansion Tank
Intercooler Expansion Tank
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Rein - Corporate Logo
T#:584477
Part#: 17137647281
Ships Jul 21, 2025
$ 63.53 USD
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$ 63.53 USD
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Rein - Expansion Tank G30 540iX, G32 640iX, G11 740i
Rein - Expansion Tank G30 540iX, G32 640iX, G11 740i
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Rein - Corporate Logo
T#:33946948
Part#: 17139846642
Special Order: No Guaranteed ETA
$ 84.95 USD
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$ 84.95 USD
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The Expansion Tank is an essential part of your vehicle’s cooling system, designed to accommodate the expansion of coolant as it heats up during engine operation. This high-quality tank helps regulate coolant pressure, preventing overheating and ensuring optimal engine performance. Built to meet or exceed OEM standards, this expansion tank is crafted from durable, heat-resistant materials to provide long-lasting reliability. It offers a direct fit for a wide range of European vehicles, ensuring easy installation.

  • Prevents Overheating: Manages coolant expansion to maintain consistent engine temperature.
  • Durable Construction: Made from premium, heat-resistant materials to ensure long-term durability.
  • OEM Quality Fit: Designed for a precise fit, meeting or exceeding original equipment specifications.
  • Leak-Proof Design: Provides a secure seal to prevent coolant loss and maintain system efficiency.
  • Easy Installation: Direct replacement part, compatible with a variety of European vehicle models.

Find the Rein Expansion Tank at Turner Motorsport for top-quality replacement parts and reliable performance.

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