My very first UOA. Opted for a TBN as well. Blackstone Laboratories.
Running same oil and Mazda RX-8 (N3R1-14-302) Tokyo Roki Filter since acquiring the vehicle with 108,540 miles on Nov 20, 2020.
~3k OCIs - 1st at 62 miles into ownership (2,645 miles on existing oil) - this one 4th at 118,321...