Just got my 2K and 3K sample report. TBN is dropping, but will probably stabilize. Calcium going up? Soot went up at 1K then dropped a little at 2K (during long hot road trip). Phosphorus going down. Less than 200 miles to go until the 4K mark!
Just sent off a sample taken at 4006 miles of the Mobil 1 ESP Formula M 5W-30. That means an update in a couple of weeks. This stuff is blacker than a night of the dark of the moon at the bottom of a Virginia coal mine!