My 330 is just finishing break-in (1300 mi), and I needed to decide whether to do an early oil change. So I pulled the filter and checked out the oil. I figured if the oil looked good, I'd just change the filter. If the oil looked contaminated, I change oil and filter.
Anyway, the oil is darker, and has a strong crankcase (gasoline) smell. But most importantly, there is a very noticable amount of gold metal flakes in the oil. I tried to get pictures, but I don't have a great camera or a macro lens.
The lighter oil is BMW oil straight from the bottle.
My conclusion is that an oil change is worthwhile at this point. I'll be picking up some oil this week for a change next weekend (already got the filter.)