Remove the lower plastic air dam. I'm surprised how much water it can hold before dripping. It's how I confirmed a coolant leak. Mine currently leaks at the transmission oil cooler. If the transmission lines move too much, the cooler teeters. When the cooler teeters off center, the lower seal comes out and leaks.

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