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Rein BMW Coolant Expansion Tanks for BMW 3 Series E90 (2006-2011)

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 E9X Z4 E8X Coolant Expansion Tank

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T#:402142

Part#: 17137640514

In Stock

$ 70.99

This product was last offered at the strikethrough price on
06-22-2026

$ 70.35 USD

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$ 70.35 USD

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Includes level sensor

Coolant Expansion Tank

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T#:592020

Part#: 17137640515

In Stock

$ 97.99 USD

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$ 97.99 USD

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Includes level sensor

OEM Rein Expansion Tank - E90 335d

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T#:555023

Part#: 17138570079

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$ 124.99 USD

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$ 124.99 USD

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Replace your damaged expansion tank to prevent coolant loss or potential overheating issues.

This item fits the following BMW Chassis:
E90

Fits BMW Engines including:
M57

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Rein Expansion Tank Cap

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T#:384807

Part#: 17117639021

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$ 16.99 USD

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$ 16.99 USD

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Cap for plastic expansion tank

BMW Expansion Tank With Cap - 17138570079

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T#:46616019

Part#: EPK0146

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$ 93.99 USD

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$ 93.99 USD

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The coolant expansion tank serves as a reservoir for excess coolant as it expands and contracts with changing temperatures. Since it’s constantly exposed to extreme heat cycles, it can eventually crack, split, or suffer broken nipples or mounting points. To keep your cooling system sealed and operating properly, any damaged tank should be replaced.

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BMW Coolant Expansion Tank With Cap

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T#:46616007

Part#: EPK0131

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$ 104.99 USD

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$ 104.99 USD

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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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Rein BMW Coolant Expansion Tanks for BMW 3 Series E90 (2006-2011)

BMW E9X Z4 E8X Coolant Expansion Tank

Coolant Expansion Tank

OEM Rein Expansion Tank - E90 335d

Rein Expansion Tank Cap

BMW Expansion Tank With Cap - 17138570079

BMW Coolant Expansion Tank With Cap

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