<p><strong>2017–2020 BMW 530i/540i G30 Radiator Overflow Expansion Tank</strong> — OEM replacement reservoir for coolant system management on 5 Series sedans.</p> <ul> <li>Fits 2017–2020 BMW 530i and 540i (G30 platform)</li> <li>OEM factory part ensures exact fit and durability</li> <li>Maintains proper coolant levels and pressure regulation</li> <li>Direct replacement with no modifications needed</li> </ul> <p>Keep your cooling system functioning properly with this genuine BMW overflow tank — eliminates leaks and maintains stable engine temperatures.</p>