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My zinc for the last few reports was:
1031 on 5/1/2014, 3,172 miles, Castrol 5W40 (previous fill Mobile 1 0W40)
1031 on 10/8/2014, 3,308 miles, DT40 (previous fill Castrol 5W40)
1240 on 4/8/2015, 2,570 miles, DT40, TBN 7.7 (paid extra that time, was curious)
1131 on 11/14/2015, 3,801 miles, DT40
If this was your 3rd oil change with DT40, the oil tested was the 2nd fill of DT40 any previous remnants of a previous fill should be gone?. Maybe the zinc gets used up more over time in addition to miles?
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