It's been over a month. No leaks until yesterday. Is it normal for seals to leak when it's cold? It's been below freezing for a few days. The leak is right below the tank. The new tank is going to be replaced anyway. The "check coolant level" is annoying. I'll get underneath and check the leak location. A replacement tank is ready. I'll keep the removed one as an emergency replacement.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)