Thanks for the responses, guys.
I had been leaning toward the BMW 5w-30 as well.
Anyone know anything about Motul X-Max 5w-30 (formerly Motul BMW-Specific LL-01)? I have some of that left over from a recent change in my car. If the chemistries are similar and compatible, I may either give that to my brother for use with the 3 qts of GC or use the GC as make-up oil in my car...