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BMW Coolant Expansion Tanks

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 Coolant Expansion Tank With Cap
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:46616007
Part#: EPK0131
Ships in 3 Business Days
$ 104.99 USD
Free Shipping on orders $49 and up
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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Moroso - Corporate Logo
T#:29666104
Part#: 63850
In Stock at Vendor
$ 586.00 USD
Free Shipping on orders $49 and up

The coolant expansion tank provides hot coolant with a place to travel, preventing pressure buildup within your cooling system. On many BMWs, this component is constructed from plastic. While cheap to replace and manufacture, a failed cooling tank can cause costly engine damage.

With this issue in mind, Moroso designed a high-quality replacement. Featuring TIG welded, 100% aluminum construction, this tank is sure to outperform it's factory counterpart.

Features:

Key Benefits:

Direct bolt-in replacement for stock, 2 piece plastic tank Fabricated Aluminum for strength, factory tanks fail after repeated high heat situations & age Features billet aluminum mounting tab/bleeder assembly for strength and precision No cutting of factory hoses is required and accepts the factory clip-on hose Included is a Moroso (63324) racing radiator cap that operates in the same pressure range as the factory cap Moroso radiator cap mounts to a billet aluminum neck that will not strip out like plastic threaded necks Can be polished, chromed, or powder coated or left as-is

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BMW Expansion Tank Kit - 17137647283
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:46616005
Part#: EPK0151
Ships in 3 Business Days
$ 100.99 USD
Free Shipping on orders $49 and up
Replace your damaged expansion tank to prevent coolant loss or potential overheating issues. his item fits the following BMW Chassis: F01,F02,F06,F10,F12,F13 Fits BMW Engines including: N54,N55,N57N
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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
Free Shipping on orders $49 and up
$ 74.99 USD
Free Shipping on orders $49 and up
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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Expansion Tank
5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
Meyle - Corporate Logo
T#:36201637
Part#: 17139846642
Ships on Oct 19, 2026
$ 96.99 USD
Free Shipping on orders $49 and up
The Expansion Tank plays a crucial role in your vehicle’s cooling system, managing coolant expansion and contraction caused by temperature changes. It provides additional space for the coolant, preventing overheating and maintaining the cooling system's efficiency. **Key Benefits:** - **Prevents Overheating:** Regulates coolant expansion and pressure to maintain stable engine temperatures. - **Durable Construction:** Built with heat-resistant materials to endure extreme engine conditions. - **OEM Compatibility:** Precisely designed to meet or exceed original equipment standards for an easy, seamless replacement. - **Leak-Proof Design:** Features a secure seal to prevent leaks and ensure optimal system performance. - **Enhanced Engine Longevity:** Promotes proper coolant circulation, reducing engine wear and tear. The Expansion Tank is an essential component for sustaining your vehicle's cooling system and ensuring reliable engine performance over time.
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Mahle - Corporate Logo
T#:17538753
Part#: 17138616418
Back Ordered
$ 68.99

This product was last offered at the strikethrough price on
05-07-2026

$ 66.99 USD
Free Shipping on orders $49 and up
$ 66.99 USD
Free Shipping on orders $49 and up

Expansion Tank Cap
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:362007
Part#: 17114379047
Ships in 1 Business Day
$ 7.99 USD
Free Shipping on orders $49 and up
$ 7.99 USD
Free Shipping on orders $49 and up
1.2 Bar pressure
URO Expansion Tank Hose - E53
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:45278651
Part#: 11537500735
Back Ordered
$ 23.99 USD
Free Shipping on orders $49 and up
A reliable, affordable solution for maintaining cooling system integrity and long-term engine health.