Rein BMW Coolant Expansion Tanks for BMW G32 640i xDrive B58 3.0L

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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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OEM Rein Expansion Tank w/ Cap - G30 540iX, G32 640iX, G11 740i ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
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Rein - Corporate Logo
T#:33946948
Part#: 17139846642
In Stock
$ 99.65 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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BMW Coolant Expansion Tank - 17139485733
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Rein - Corporate Logo
T#:45791753
Part#: 17139485733
Ships in 4 Business Days
$ 64.99

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

$ 52.99 USD
Free Shipping on orders $49 and up
$ 52.99 USD
Free Shipping on orders $49 and up
Expansion tanks take constant abuse from high heat and harsh coolant, making them prone to cracking or failure over time. A damaged tank can quickly lead to overheating and serious engine damage, so replacement is critical at the first sign of trouble. Features: Direct fitment for hassle-free installation Precision-molded to OE specs for perfect sensor and hose connections Durable construction stands up to extreme heat and coolant chemicals Factory pressure-tested for reliable performance
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