This oil sample has a total of 21,900 miles and 503 hours on the oil. I had intended to pull a sample at 20,000 miles, but the truck needed to do real work, so the oil change had to wait. Almost all miles since the last UOA have been pulling tall and heavy. The average fuel consumption is right at 9 MPG, so the engine is working hard. I try to manage the EGTs, but there are times when you have to take what you get. The oil consumption in the last 6,450 miles is 1 quart for a total of 2.75 quarts consumed in the last 21,900 miles. The total make-up oil with oil filter changes is 3 quarts.
This analysis shows the Fe rate at 6.0ppm/1k miles. The trend is higher in the last UOA, but virtually all of the 6,450 miles is pulling. The viscosity has increased from 14.4 to 15.2 which is acceptable. The corrected oxidation is 7, which is far below Wearcheck's condemnation value of 25. The soot is 0.8%, which is also acceptable. Cu decreased and Si didn't increase, could these be lab errors? TBN is still 13.38 I'd say that's still serviceable I will change the filter and cut it to see what was caught.
Would you change this oil? If so, why?
Previous UOA:
This analysis shows the Fe rate at 6.0ppm/1k miles. The trend is higher in the last UOA, but virtually all of the 6,450 miles is pulling. The viscosity has increased from 14.4 to 15.2 which is acceptable. The corrected oxidation is 7, which is far below Wearcheck's condemnation value of 25. The soot is 0.8%, which is also acceptable. Cu decreased and Si didn't increase, could these be lab errors? TBN is still 13.38 I'd say that's still serviceable I will change the filter and cut it to see what was caught.
Would you change this oil? If so, why?
Previous UOA:
2021 Chevy Duramax L5P - 15,450 miles/387 hours on oil - 37,000 total miles/882 total hours - HPL 5w-40
This is my 2021 Chevy 3500 DRW L5P Duramax that pulls a 20,000 pound 5th wheel for a combined GVW of 29,500 pounds. I'm still pulling in eighth gear and oil consumption continues to be very low, but not zero. There have been two oil filter changes so far in the OCI, which combined required about...
bobistheoilguy.com
Sample Information | Oil Changed | ||||||||
Sample Date | 6/23/2021 | 07/17/2021 | 8/24/2021 | 4/4/2022 | 7/1/2022 | 8/10/2022 | 1/18/2023 | 4/17/2023 | 8/16/2023 |
Machine Age miles | 2,500 | 2,700 | 8,900 | 16,000 | 21,500 | 21,550 | 31,300 | 37,000 | 43,400 |
Oil Age miles | 2,500 | 200 | 6,400 | 13,500 | 19,000 | 50 | 9,750 | 15,450 | 21,900 |
Machine Time hours | 55 | 62 | 214 | 350 | 495 | 496 | 734 | 882 | 997 |
Oil Time hours | 55 | 7 | 152 | 295 | 440 | 1 | 239 | 387 | 503 |
Filter Age miles | 2,500 | 200 | 6,400 | 7,100 | 4,000 | 50 | 5,000 | 9,800 | 8,400 |
Oil Changed | Yes | No | No | No | Yes | No | No | No | |
Filter Changed | Yes | No | Yes | Yes | Yes | No | Yes | Yes | Yes |
Make-up oil | 0 | 0 | 0 | 1.5 qts | 2.5(+1) | 0 | 1 | 2(+1) | 3(+1) |
Brand | Factory | HPL | HPL | HPL | HPL | HPL | HPL | HPL | HPL |
Viscosity | 15w-40 | 5w-40 CK-4 | 5w-40 CK-4 | 5w-40 CK-4 | 5w-40 CK-4 | 5w-40 CK-4 | 5w-40 CK-4 | 5w-40 CK-4 | 5w-40 CK-4 |
Wear Metals | |||||||||
Iron | 12 | 4 | 36 | 67 | 102 | 16 | 61 | 85 | 132 |
Chromium | <1 | <1 | 2 | 3 | 4 | <1 | 2 | 2 | 4 |
Nickel | <1 | 0 | 0 | <1 | 0 | <1 | <1 | <1 | 1 |
Titanium | <1 | <1 | <1 | <1 | <1 | 0 | <1 | 0 | 0 |
Silver | 3 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | 0 |
Aluminum | <1 | 0 | 15 | 13 | 14 | 3 | 8 | 9 | 13 |
Lead | 6 | 1 | 2 | 4 | 3 | 1 | 2 | 0 | 2 |
Copper | 109 | 28 | 85 | 188 | 203 | 29 | 185 | 197 | 158 |
Tin | 6 | 1 | 0 | 6 | 6 | 2 | 2 | 2 | 2 |
Vanandium | <1 | 0 | 0 | <1 | <1 | <1 | <1 | 0 | <1 |
Additives | |||||||||
Boron | 120 | 15 | 12 | 21 | 6 | 3 | 14 | 17 | 0 |
Barium | <1 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 4 |
Molybdenum | 2 | 514 | 450 | 504 | 537 | 541 | 469 | 574 | 603 |
Manganese | <1 | <1 | <1 | 1 | 2 | <1 | 2 | 2 | 2 |
Magnesium | 672 | 995 | 968 | 1008 | 924 | 913 | 831 | 1001 | 936 |
Calcium | 1260 | 2439 | 2414 | 2557 | 2459 | 2375 | 2111 | 2722 | 2606 |
Phosphorus | 1000 | 1099 | 1029 | 1064 | 981 | 973 | 847 | 968 | 916 |
Zinc | 1155 | 1179 | 1148 | 1285 | 1233 | 1159 | 1078 | 1292 | 1256 |
Contaminants | |||||||||
Silicon | 87 | 33 | 48 | 46 | 54 | 18 | 21 | 27 | 27 |
Sodium | 7 | 5 | 3 | 3 | 5 | 2 | 5 | 8 | 10 |
Potassium | 11 | 2 | 43 | 55 | 59 | 6 | 16 | 21 | 30 |
Fuel % | <1 | <1.0 | <1.0 | <1.0 | <1.0 | <1.0 | <1.0 | <1.0 | <1.0 |
Glycol | NEG | NEG | NEG | NEG | NEG | NEG | NEG | NEG | NEG |
Soot% | 0.1 | 0.1 | 0.4 | 0.6 | 0.8 | 0.2 | 0.6 | 0.7 | 0.8 |
Fluid Condition | |||||||||
TBN | 8.55 | 14.9 | 13.3 | 13.7 | 10.8 | 13.9 | 13.76 | 12.86 | 13.38 |
Viscosity | 13.9 | 14.5 | 13.8 | 14.97 | 14.5 | 14.4 | 14.5 | 14.5 | 15.2 |
Oxidation (normalized) | 0(40.6) | 2.5(43.1) | 3.5(44.1) | 7(47.6) |
Last edited: