M-cars don't have run-flats and come with slime kits. I have one in my M3, but wouldn't use it unless there was absolutely no alternative. Using it means the tire has to be replaced even if it's an otherwise repairable puncture because of balance problems. Similarly, the wheel has to be extensively cleaned, a real pain, and likely the sensors replaced. I put together a space saver spare and carry it in the trunk, and unfortunately have had to use it.
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