BMW Coolant Expansion Tanks for BMW 3 Series E36 (1992-1998)

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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
Coolant Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:373102
Part#: 17111723520
In Stock
$ 30.99 USD
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$ 30.99 USD
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Does not include cap or coolant level sensor
Moroso Performance Aluminum Expansion Tank - E36, Z3
Moroso Performance Aluminum Expansion Tank - E36, Z3
Moroso - Corporate Logo
T#:568887
Part#: 63791
In Stock
$ 445.99

This product was last offered at the strikethrough price on
08-07-2026

$ 418.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
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$ 445.99

This product was last offered at the strikethrough price on
08-07-2026

$ 418.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
Add to Wish List
If you have ever experienced a leaking plastic BMW expansion tank you will realize the value of this aluminum version straight away. Even if a failure has not happened to you, it's easy to tell this tank is much stronger and more durable than the plastic used in the stock design. The original BMW plastic tanks suffer from leaks and failures with no warning. While being lightweight and recyclable the design and construction of the stock tank is just not up for reliable long term use. Moroso coolant expansion tanks are all pressure tested for guaranteed leak-free operation and utilizes the stock pressure cap to prevent excessive pressure in the cooling system from blowing off a radiator hose or seal! Features: Each cooling system expansion tank includes a 1/8 in. pipe overflow fitting at neck, a 1/4 in. NPT water intake bung, and a 1/2 in. bung at the bottom for plumbing a line to the radiator Rugged 6061-T6 billet aluminum filler necks welded to tank to withstand continuous removal and installation of cap 100% pressure tested to eliminate leaks Accepts a standard-size radiator cap
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Coolant Level Sensor
Coolant Level Sensor
For vehicles with production date from 03/1996 For vehicles with production date from 06/1995
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:379491
Part#: 61318360855
Ships in 1 Business Day
$ 12.99 USD
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$ 12.99 USD
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Monitors the coolant level in the expansion tank
URO Coolant Expansion Tank - BMW E30 E36 Z3 M42 M44, E34 325
URO Coolant Expansion Tank - BMW E30 E36 Z3 M42 M44, E34 325 ...
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:362008
Part#: 17111712835
Ships in 1 Business Day
$ 18.99 USD
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$ 18.99 USD
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The coolant expansion tank in your vehicle gives additional fluid a place to go after expansion and contraction from temperature change. Because it is subjected to such drastic changes on a regular basis, it can often crack or break
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URO Expansion Tank Cap - BMW E30
URO Expansion Tank Cap - BMW E30
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:592118
Part#: 17111468077
In Stock
$ 6.99 USD
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$ 6.99 USD
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URO Expansion Tank Cap - BMW E30

The URO Expansion Tank Cap - BMW E30 is a crucial component for maintaining optimal cooling system performance by ensuring proper pressure regulation. Over time, older radiator caps lose their ability to hold pressure, leading to a lower boiling point and potential overheating issues. This high-quality replacement cap is designed to restore factory pressure levels, preventing coolant loss and maintaining engine efficiency. Crafted from durable materials, it resists wear and temperature fluctuations, ensuring long-lasting reliability.

  • Direct replacement for BMW E30 models
  • Maintains correct cooling system pressure to prevent overheating
  • Helps sustain optimal engine temperature and performance
  • High-quality construction for durability and reliability
  • Prevents coolant evaporation and system inefficiencies
  • Easy installation with OE-style fitment
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