Looks like things are clearing up on our M45. Iron and Aluminum are still a little higher than universal averages, but not enough for Blackstone to flag. Everything else is settling down nicely. Previous two oils are M1 0W40 and Supertech 5W30. The oil in there now is M1 5W30 HM SN+. We'll drain and sample sometime in July. We're sticking to ~4200 miles on the OCIs, which comes out to about 3 oil changes per year.