Change it. And while you are at it, get yourself a copy of Mike Miller's Lifetime Maintenance Schedule.
Mike is the technical editor for Roundel and Bimmer and has developed an excellent guide for ALL BMW maintenance (not just the oil). He will send it to you for free if you email him (his email address is in either of those two mags).
He covers everything and has good rationale and explanations for his recommendations.
Good luck!
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