{"product_id":"coolant-expansion-tank-5","title":"Coolant Expansion Tank","description":"The BMW 17137647283 is a genuine BMW expansion tank, also known as a coolant reservoir or overflow bottle. Its primary function is to safely store excess engine coolant that expands as it heats up, and to feed coolant back into the system as it cools. Over time, the plastic construction of these tanks can become brittle and prone to cracking due to repeated extreme temperature cycles and pressure, often leading to coolant leaks. Symptoms of a failing expansion tank can include visible leaks, foggy or opaque plastic making level checks difficult, or even engine overheating if system pressure is compromised.\n\nThis expansion tank is a direct replacement for OE part number 17137647283 and is compatible with various BMW models, including the F01, F02, F06, F07, F10, F12, and F13 chassis, specifically for models such as the 740i, 740Li, 640i, 535i, and their respective xDrive and GT variants, typically with 3.0L engines (N54, N55, N57). It includes the level sensor but does not come with the expansion tank cap. When replacing the expansion tank, it is recommended to also purchase and replenish BMW coolant to replace any fluid lost during the process.","brand":"BMW \/","offers":[{"title":"Default Title","offer_id":52687211823416,"sku":"17137647283","price":86.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/660681184.jpg?v=1784881444","url":"https:\/\/store.motormia.co\/products\/coolant-expansion-tank-5","provider":"MOTORMIA","version":"1.0","type":"link"}