This is HPL 15w-40 that now has 12,500 miles on the oil. The TBN is still 13.6 after 6 months and 12,500 miles. I didn't change the oil or filter and probably won't until I get another 5,000 miles. The soot is at 0.6% and doesn't appear to be causing any wear. I have not been able to find a statement by GM on what the soot limit is for the Duramax.
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Sample Information | ||||||
Sample Date | 25 Apr 2019 | 1 Sept 2019 | 01 Nov 2019 | 08 Jun 2020 | Aug 2020 | Oct 2020 |
Machine Age miles | 13,000 | 19,600 | 25,300 | 30,750 | 37,800 | 43,259 |
Oil Age miles | 5,500 | 6,600 | 5,700 | 5,450 | 6,400 | 12,509 |
Machine Time hours | 320 | 475 | 590 | 734 | 886 | 1000 |
Oil Time hours | 120 | 150 | 119 | 144 | 152 | 266 |
Filter Age miles | 5,500 | 6,600 | 5,700 | 5,000 | 6,400 | 12,509 |
Oil Changed | yes | yes | yes | yes | no | no |
Filter Changed | yes | yes | yes | yes | no | no |
Brand | Delo | Delvac 1 | Delvac 1 | Delvac 1 | HPL | HPL |
Viscosity | 5w-40 | 5w-40 | 5w-40 | 5w-40 | 15w-40 | 15w-40 |
Wear Metals | ||||||
Iron | 20 | 52 | 34 | 20 | 23 | 42 |
Chromium | 0 | 0 | 0 | TD] [TD]TD] [TD]TD] | ||
Nickel | 0 | 0 | 0 | 0 | 0 | 0 |
Titanium | 0 | 0 | 0 | 0 | TD] [TD]TD] | |
Silver | 0 | 0 | 0 | 0 | 0 | 0 |
Aluminum | 10 | 9 | 8 | 4 | 4 | 13 |
Lead | 3 | 0 | 0 | 0 | 2 | 4 |
Copper | 397 | 356 | 69 | 17 | 63 | 167 |
Tin | 1 | 1 | 3 | 1 | 1 | 0 |
Antimony | 0 | 0 | 0 | 0 | TD] [TD]TD] | |
Vanandium | 0 | 0 | 0 | 0 | TD] [TD]0 | |
Cadmium | 0 | 0 | 0 | 0 | 0 | TD] |
Additives | ||||||
Boron | 73 | 77 | 102 | 91 | 197 | 138 |
Barium | 0 | 0 | 0 | 0 | 0 | 0 |
Molybdenum | 0 | 46 | 53 | 47 | 604 | 561 |
Manganese | 0 | 0 | 0 | TD] [TD]TD] [TD]TD] | ||
Magnesium | 746 | 1013 | 1040 | 894 | 471 | 482 |
Calcium | 1348 | 1146 | 1159 | 1000 | 3654 | 3786 |
Phosphorus | 741 | 1072 | 1117 | 1030 | 870 | 866 |
Zinc | 811 | 1345 | 1353 | 1120 | 1084 | 1032 |
Contaminants | ||||||
Silicon | 25 | 22 | 12 | 9 | 13 | 14 |
Sodium | 2 | 4 | 4 | 2 | 3 | 7 |
Postassium | 42 | 37 | 11 | 5 | 4 | 5 |
Fuel % | TD] [TD]1.7 | TD] [TD]TD] [TD]TD] [TD]TD] | ||||
Glycol | Neg | Neg | Neg | Neg | Neg | Neg |
Soot% | 0.1 | 0.2 | 0.1 | 0.3 | 0.3 | 0.6 |
Fluid Condition | ||||||
TBN | 5.14 | 7.01 | 8.07 | 11.7 | 14.3 | 13.6 |
Viscosity | 15.3 | 13.2 | 13.4 | 13.5 | 14.7 | 14.61 |
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