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There is a ton of information online, but my understanding is that the 1200 miles is so there is enough wear on the diff and engine so that all the small metal particles generated from the break-in period are removed with the initial diff and engine oil changes.
Personally, I'd wait until at least 1000 miles.
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2020 F87 M2C Hockenheim Silver/MT
2002 E39 M5 Sterling Gray/Caramel
2007 E86 Z4M Coupe Silver Gray/Black
2021 Kia Telluride (hauler)
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