Moroso Aluminum Coolant Expansion Tank - E9X Non-M

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 Moroso part (63324) racing radiator cap included; 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 This aluminum tank can be polished, chromed, powder coated or left as-is

T#: 29666105 | Part#: 63851
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
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488.99 $488.99
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Availability:
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Est. Ship Date:
Ships Jun 25, 2026
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Turner Heavy Duty Aluminum Expansion Tank Kit - E8X E9X N20/N52/N54
Upgrade with Turner Motorsport

N20/N52/N54 Heavy Duty Aluminum Expansion Tank Kit

Ships on Jul 29, 2026 Turner Motorsport
$479.99

$383.99
Moroso Aluminum Coolant Expansion Tank - E9X Non-M
$488.99

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