How big are they? ... or are you just seeing the light streaks in the oil pan like often seen on engines after the first oil change after a break-in. I can see those super small aluminum particles suspended in the oil, but they are still too small to be caught by a normal spin-on oil filter. Seen that on every new engine's first oil change that I've done.Correct. That much I did know, but was curious why I saw the bigger flakes in the oil, considering there is no screen on the pump.
Looking at the photo of the oil trapped in the filter, those particles look pretty big ... bigger than I'd expect. So apparently they were still small enough to become suspended in the oil and picked up by the pump, and then and caught by the media in the filter. But the "aluminum streak" phenomena I described are aluminum particles too small to be caught by the filter.