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Following up on this thread. Yes, in my previous post I meant that instead of changing both front and rear diff fluid, only rear diff fluid was changed in my 1200 mi breakin. (Breakin service was actually performed at 998 miles —SA insisted that was fine. Car was brought in for a wheel+tire swap and soft-close issue originally.)
Engine oil and filter were also replaced, so it was a "normal" 1200mi service for an LCI M5.
Because I couldn't leave it at that, I followed up with Genius about a week or two ago. After a lengthy hold, Genius rep confirmed that all current model year M cars (3,4,5,8) and drivetrains have a 1200 mi service that does not replace front diff fluid.
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