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coolant expansion tank

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Rein Coolant Expansion Tank - E46, E53, E83

2X Entries Into Our F80 M3 Sweepstakes

T#:402141

Part#: 17117573781

In Stock

$ 76.39 USD

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$ 76.39 USD

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URO Coolant Expansion Tank - BMW E46 M3

2X Entries Into Our F80 M3 Sweepstakes

T#:48608189

Part#: 17112283344

Ships in 1 Business Day

$ 155.99 USD

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$ 155.99 USD

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This radiator coolant reservoir/expansion tank for E46 M3 is a common failure item as the plastic weakens and cracks, causing coolant leaks. If your E46 M3 has over 80k miles and still has the original expansion tank, we highly recommend replacing it during your next major service.

Coolant Expansion Tank - E53 E46 E83 M52 M54

2X Entries Into Our F80 M3 Sweepstakes

T#:373103

Part#: 17137787039

Ships in 1 Business Day

$ 45.99 USD

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$ 45.99 USD

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We have found that the expansion tanks should be replaced based on age as well as condition. Expansion tanks seem to have a lifespan of less than six years before they show signs of fatigue and wear. Pre-emptively replacing the expansion tank as part of an overall maintenance plan can prevent you from getting stranded from a sudden failure later on.

Expansion Tank Hose

10X Entries Into Our F80 M3 Sweepstakes

T#:27572101

Part#: 64218376153

In Stock

Sale - Save 20% $ 47.99

This product was last offered at the strikethrough price on
05-03-2026

$ 38.34 USD

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Sale - Save 20%

$ 47.99

This product was last offered at the strikethrough price on
05-03-2026

$ 38.34 USD

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Bremmen Coolant Bleeder Screw - BMW E30 E36 E38 E39 E46 E83 E90 Z4 ...

10X Entries Into Our F80 M3 Sweepstakes

T#:640140

Part#: 17111712788

Ships on Dec 10, 2026

Sale - Save 39% $ 3.99

This product was last offered at the strikethrough price on
09-02-2026

$ 2.44 USD

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Sale - Save 39%

$ 3.99

This product was last offered at the strikethrough price on
09-02-2026

$ 2.44 USD

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URO Expansion Tank Hose - Heater Core To Expansion Tank - BMW E46 M52...

2X Entries Into Our F80 M3 Sweepstakes

T#:43750239

Part#: 64218376153

In Stock

$ 29.99 USD

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$ 29.99 USD

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Over the years and with exposure to extremely hot coolant, the coolant hoses in your vehicle can take a beating. Being made of reinforced rubber, these hoses can fail in a number of ways. Splitting at a hose clamp, swelling, cracking, and breaking are just a few of the ways this hose can leave you stranded. Replace it at the first sign of wear to keep your coolant in your engine. With the proper diameter, bends, and lengths, this is the perfect replacement for any swelled or damaged hose. An easy installation, it's piece of mind the next time you are on a long trip or your morning commute.