BMW Coolant Expansion Tanks for BMW 6 Series E63 (2004-2010)

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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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Coolant Expansion Tank Cap - E9x M3, E60 E63 F01 E70 E71
Coolant Expansion Tank Cap - E9x M3, E60 E63 F01 E70 E71
Genuine BMW - Corporate Logo
T#:194502
Part#: 17117639021
In Stock
22% off MSRP $ 34.96

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 27.29 USD
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22% off MSRP
$ 34.96

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 27.29 USD
Free Shipping on orders $49 and up
Add to Wish List
This radiator expansion tank cap is used most BMW's from 2006+. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.
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Rein Expansion Tank Cap
Rein Expansion Tank Cap
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:384807
Part#: 17117639021
In Stock
$ 16.99 USD
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$ 16.99 USD
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Cap for plastic expansion tank
Expansion Tank Cap
Expansion Tank Cap
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:373099
Part#: 17137516004
Ships in 1 Business Day
$ 10.99 USD
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$ 10.99 USD
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The coolant expansion tank cap keeps necessary pressure on your coolant to increase efficiency. If you have an overheating issue in your vehicle, a simple, quick, and inexpensive part to replace is this cap.
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Expansion Tank Cap
Expansion Tank Cap
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Febi - Corporate Logo
T#:382437
Part#: 17117639021
Special Order: No Guaranteed ETA
$ 25.99 USD
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$ 25.99 USD
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Maintain maximum cooling efficiency and system pressure with this Febi Bilstein 2.0 bar replacement cap.
BMW Expansion Tank With Cap
BMW Expansion Tank With Cap
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:46616010
Part#: EPK0128
Ships in 3 Business Days
$ 86.99

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

$ 74.99 USD
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$ 74.99 USD
Free Shipping on orders $49 and up
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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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