Hi all 🤗 !!! I replaced the coolant expansion tank of my BMW e60 550i because of a crack inside the overflow drain line, that is common for N62B48 engine due to high operating coolant temperature apx. 110 deg C! Replacing of this tank is not hard to DIY and I want to show you how to do it just for few minutes . Please see the video below 👇 👇 👇 , that is the fastest and easy way to replace it , really just for few minutes.