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Unfortunately not all long cranks generates codes for the ecu to store. What you could do is have your phone do a video each time you start the car to see if you get lucky and capture it to show the dealer. I would have the video show you pressing the start button and the instrument panel so they can see when the car actually starts.
Long cranks usually means your fuel pump needs to be replaced. Bmw is all too familiar with this problem.
Alan
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