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BMW Coolant Expansion Tanks for BMW 6 Series F12 (2012+)

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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Meistersatz CAP- EXPANSION TANK

T#:1195781

Part#: 17117639021

Ships in 3 Business Days

$ 30.99

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

$ 29.99 USD

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$ 29.99 USD

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MMX 90mm Billet Coolant Expansion Tank Cap | BMW

T#:29002094

Part#: MMR03-1502

Ships in 2 Business Days

$ 127.99 USD

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$ 127.99 USD

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The MMX Performance 90mm billet coolant expansion cap for BMWs has been designed from the ground up in the UK, from a solid piece of billet aluminum. Each cap was designed to directly replace the OE cap, not merely stuck in place. Fitment is for models with the matching OE (17 11 7 639 021) part number.

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Meyle Expansion Tank Cap

5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

T#:579357

Part#: 3148009004

In Stock

Sale - Save 40% $ 14.99

This product was last offered at the strikethrough price on
05-15-2026

$ 8.99 USD

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Sale - Save 40%

$ 14.99

This product was last offered at the strikethrough price on
05-15-2026

$ 8.99 USD

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Replace worn or missing pieces.

BMW Expansion Tank With Cap - 17137601948

2X Entries Into Our F80 M3 Sweepstakes

T#:46616024

Part#: EPK0141

In Stock

$ 97.99

This product was last offered at the strikethrough price on
06-01-2026

$ 87.99 USD

Limited Qty Sale

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$ 97.99

This product was last offered at the strikethrough price on
06-01-2026

$ 87.99 USD

Limited Qty Sale

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The coolant expansion tank provides a reservoir for excess coolant as it expands and contracts with temperature fluctuations. Constant exposure to these extreme changes can eventually cause the tank to crack or fail.

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Rein Expansion Tank Cap

2X Entries Into Our F80 M3 Sweepstakes

T#:384807

Part#: 17117639021

In Stock

Sale - Save 5% $ 16.99

This product was last offered at the strikethrough price on
08-31-2026

$ 16.14 USD

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Sale - Save 5%

$ 16.99

This product was last offered at the strikethrough price on
08-31-2026

$ 16.14 USD

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Cap for plastic expansion tank

BMW Expansion Tank Kit - 17137647283

2X Entries Into Our F80 M3 Sweepstakes

T#:46616005

Part#: EPK0151

Ships in 3 Business Days

Sale - Save 6% $ 100.99

This product was last offered at the strikethrough price on
08-31-2026

$ 95.28 USD

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Qty

Sale - Save 6%

$ 100.99

This product was last offered at the strikethrough price on
08-31-2026

$ 95.28 USD

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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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