Did you see the $1500 X5 on the Craigslist post? It needs a head gasket.

Wow! One more reason for me to replace a new installed expansion tank. The coolant level warning won't turn off. I would say without a current refresh, we should check fluids once a week. Even pressure test before a long trip.

Good luck!

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