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Earlier is better. In fact, most engine and trans builders say you should change the fluid even earlier because of the metal shavings that happen in the first 20 or so miles.
The 1,200 miles has been around for a while - IMO it is a number based on the "we don't want them to have to go home and turn around" combined with "let them figure out the car" to the "let the brakes set" to a million other things (and of note, the diff fluid is supposedly different from the factory than what they change it out to).
Long story short, I personally would have taken them up on that early service.
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2011 1M, Black loaded sans sat radio
2021 911 C4S Gentian Blue, manual
2023 X3 M40i - loaded sans Park Assist
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