I recently replaced my entire cooling system during my engine swap and it hasn't even been 8k miles and the dam expansion tank is leaking already? Is BMW serious with such a design or they don't care? Or did I just get a faulty product? Is this a normal thing? What's the earliest you heard that someone had to replaced theirs?
Replace the tank cap, they can have issues over the years as well.
The good news if it was purchased via a dealer, 24 Month/Unlimited Mileage Warranty, does not help that is has to be changed, just helps the wallet if you are still within the 24 Month window.
Oh and it's leaking where the seams are at the top
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