Hurry up and go get another two quarts. One to bring it up to the specified 6.1 quarts and one to have on hand when doing periodic checks before the next change. BMWs in general will consume some oil in between changes. Do not start out on the low side of the stick and do not overfill either.
That engine should have alot of life left. Don't kill it prematurely.
Willobmw