looks like used engine oil with about 3k miles on it (from a gasoline engine). I had one customer comment as he watched me pour it in, "hey, are you sure that stuff is ok to put in my engine?" He was referring to how dark it looks compared to new engine oil. I assured him that the color was normal.
Off topic: BTW, he and his wife both commented how good the fuel economy on this 2002 325 Ci was while the ARX was in the engine. I had not even told him about that benefit or possibility. We are now using the maintenance dose in that car one year later.