Oil change at both 250 and 1k miles? Super overkill if you ask me. I'm sure you can do a standard change at 5k (or even 10k which is what I think BMW actually recommends) and your car will be absolutely fine.
If the owner's manual doesn't state it, I don't do it. That's my rule of thumb. BMW says to rely on the in-car oil life monitor and doesn't even mention service intervals in the manual to begin with.
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