Actually I believe that it has to do with air pressure when closing the door. Having it open a little bit allows for there to be equal pressure when the door closes.
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350z / 40th 370z / C6 Z06 / BMW M4 / V10 R8 / C7 Grand Spot / 997.1 GT3 / S2K / Camaro ZL1 / 718 GTS / 991.2 GT3
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