I've seen so many different responses when it comes to this. I was getting the same message every 700-800 miles also.
I changed my crankcase valve vents. They get clogged. I'm still under warranty under my cpo 15 M6 so I did not pay.
Ever since then I'm on 2900 miles with no add a quart message. I also change my oil every 3k miles.
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