I only did TBN a few times (costs extra):
132,898 (5,463 mi on oil)
-TBN 7.2
-Insolubles 0.4% (expected is <0.7)
161,462 (5,238 mi on oil)
-This is when I had a big lead spike, Blackstone thought it might of been a particle streak, but thought the spine was high for that and suggested going...