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