What you're seeing is "soot" in the oil. Soot is submicronic, in size, & doesn't really do any damage. It goes right through even very fine filtration as found on most bypass filters. It's small enough to 'float' in the oil film even between close tolerances such as found in bearing surface areas.
Soot can become a problem if it agglomerates (bunches up, clusters). It can clog filters, etc. , then. But, you would have to put many miles on the oil for that to happen.
My last oil change had just under 10,000 miles, on it (Chevron Delo-400) & the oil was still in good, useable condition. This was on my '03 Dodge/Cummins.
If you are still concerned, you could take an oil sample, send it to a testing facility, & find out, for sure, that the oil is still in good condition.
I wouldn't be too concerned.
Joe F. (Buffalo)