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Just test drove M5 and X3 M with ventilated seats on a hot day. It doesn’t help much to be honest. Had them on the X5 M, too. I would turn them on often but they honestly made little difference.
What worked great for me in the M3 is getting 3M crystalline tint. Interior is WAY cooler. My AC is running at like 2 bars lower. And I don’t get the sweaty back feeling anymore on super hot days.
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