I have always had an issue with the run flats on BMWs, and I've changed over my vehicles to non-run flat tires. In my current car I have a can of slime in the trunk and I always carry my AAA card. So far no problems with flats.
In my upcoming f10 I'm planning to replace the tires, but keep the stock wheels. Will probably mount one of the run flats on a cheap rim and keep it in the trunk as a full-size spare. Added weight and less trunk space is worth it to have peace of mind and greater independence in an emergency.
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