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There's a really long in these forums about this topic.
Apparently BMW does not use break-in oil on these cars. I also did not want to keep my original oil for 15,000 miles.
I had the dealer do an out-of-cycle change at 4,000 (just before a long trip). I'll have the second change done on schedule at about 15,000. After that, I'll probably change it every 7,500.
It's a lot more expensive to change than other cars due to the synthetic oil requirement, but I plan on keeping this car for a long time, so I think it's worth it.
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