Also, as a general rule, tyres with soft sidewalls require slightly higher pressures than tyres with stiff sidewalls, like runflats. The driving style matters as well. If you drive smoothly, you can go slightly lower on the pressures. For high speed driving in the rain, higher pressures are better.
BMW has always recommended higher pressures in the rear than the front. My experience is that the car handles better with equal pressures in all corners, but it depends on your driving style.
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