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  • Expansion Tank Cap - Clickable Automotive
  • Expansion Tank Cap - Clickable Automotive
  • Expansion Tank Cap - Clickable Automotive

Expansion Tank Cap

The highest quality overflow expansion tank cap from BMW supplier, Reutter.

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$29Priced Individually — incl. GST

In stock at our Melbourne warehouse

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Description

This is the exact same expansion tank cap as originally fitted at the factory—ensuring perfect fitment, correct pressure regulation, and long-term reliability.

A faulty coolant cap can lead to poor system pressure, coolant leaks, or even overheating. If you’re replacing your expansion tank, dealing with cooling system issues, or simply performing preventative maintenance, this is the correct cap to use.

Suitable for a wide range of late-model BMWs, including E90, F10, F30, E70 X5, and many others, this OE cap is designed to maintain the specified pressure in your cooling system—just as BMW intended.

Helpful tips

The expansion tank cap also acts as a safety valve, designed to release pressure before your hoses, fittings, and radiator bursts.

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How we work

Matched to Australian-delivered modelsNot a global catalogue. Every fitment is mapped to AU specifications.
One price, for everyoneOur price is our best and only price. No seasonal sales, no discount codes.
Carefully curated rangeNot every part we can find — only ones we'd fit ourselves.
OE and OEM-quality suppliersThe same manufacturers that supply the European factories.

Specifications

Manufacturer
OEM Supplier*
Required per car
1

Part numbers

OEM
17117639020
Alternative
17117521071

Part numbers are provided for reference only. For correct compatibility to your vehicle, please follow our fitment advice.

Fitments

11 chassis groups · 111 fitments

Browsing all compatible vehicles — to confirm fit.