That is a covered item. It is not a part of BMW's wear & tear items nor is it under BMW's regular scheduled maintenance. If the X is CPO'd, it should be covered. Tires, brakes, windshield wipers, fluids, etc are not. If your SA tells you the tank failed because of lack of coolant maintenance, then you tell them it is an item covered under the CPO program and that should have been done when an inspection was performed before it was placed on their lot under the BMW CPO program.

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2011 E70 50i M Sport