This is the first sample of HPL 0w-20 Dexos D from my 2024 Chevy Tahoe with the 3.0L diesel. The engine did consume a total of 1 quart of oil during this 10,640 mile run. Approximately 9,500 miles was highway and the balance in town.
This engine will consume oil when operated at high EGTs. There is no magic EGT number when the engine starts consuming. However, the higher the EGTs the more it will consume. To me the oil consumption is not a surprise given that the 3.0L puts out 92 HP/L, which produces a ton of heat in the piston crowns. The oil consumption is likely from evaporative loss, which makes sense given the light base stocks required for a 0w. I have spoken to David at @High Performance Lubricants about the oil consumption and they will blend a 5w-20 or 5w-30 with base stocks that will minimize consumption as much as possible. Another example of HPL custom formulating and blending an engine oil for a specific application. How cool is that!
I still try to keep the EGTs below 1,100F by shifting into a lower gear, but sometimes that's not possible. Cruising 75MPH down the interstate uphill and into a headwind takes lots of power. Power makes heat and lots of it concentrated in those 3 liters of displacment.
Iron and silicon have increased, however the rate that Fe is being added to the oil is normal and silicon has increased but we don't know if it is still leaching from the sealants or if it is from ingested dirt. My guess is sealants. I inspected the air filter and found nothing physically wrong. The filter was visibly dirty, so I replaced it with an STP filter, which was the only brand AZ had on hand. We live in a dusty environment, so 15k air filter changes are probably going to be the norm. TBN and oxidation are stellar. I'm a bit surprised soot is 0.6%, but well below my condemnation point.
Oil filter is a PPE 114000650, which remains in service.
I have included the ppm/1k miles calculation, which makes the rate of wear and contamination easier to see.
edit - filter video added Jan 10, 2025
I finally got around to adding this video of the filter media from the filter used during this run of oil. The oil was changed on Oct 12, 2024 with 12,100 miles on the oil and filter and 15,000 miles total on the engine. The flakes in this filter are more machining chips being scavenged from the engine. Again, it's disappointing that GM doesn't do a better job of cleaning the machining debris from these engines.
https://bobistheoilguy.com/forums/t...iles-65-total-hours-hpl-0w-20-dexos-d.382762/
This engine will consume oil when operated at high EGTs. There is no magic EGT number when the engine starts consuming. However, the higher the EGTs the more it will consume. To me the oil consumption is not a surprise given that the 3.0L puts out 92 HP/L, which produces a ton of heat in the piston crowns. The oil consumption is likely from evaporative loss, which makes sense given the light base stocks required for a 0w. I have spoken to David at @High Performance Lubricants about the oil consumption and they will blend a 5w-20 or 5w-30 with base stocks that will minimize consumption as much as possible. Another example of HPL custom formulating and blending an engine oil for a specific application. How cool is that!
I still try to keep the EGTs below 1,100F by shifting into a lower gear, but sometimes that's not possible. Cruising 75MPH down the interstate uphill and into a headwind takes lots of power. Power makes heat and lots of it concentrated in those 3 liters of displacment.
Iron and silicon have increased, however the rate that Fe is being added to the oil is normal and silicon has increased but we don't know if it is still leaching from the sealants or if it is from ingested dirt. My guess is sealants. I inspected the air filter and found nothing physically wrong. The filter was visibly dirty, so I replaced it with an STP filter, which was the only brand AZ had on hand. We live in a dusty environment, so 15k air filter changes are probably going to be the norm. TBN and oxidation are stellar. I'm a bit surprised soot is 0.6%, but well below my condemnation point.
Oil filter is a PPE 114000650, which remains in service.
I have included the ppm/1k miles calculation, which makes the rate of wear and contamination easier to see.
Sample Information | |||
Sample Date | 5/4/2024 | 5/5/2024 | 9/22/2024 |
Machine age miles | 3,000 | 3,050 | 13,690 |
Oil age miles | 3,000 | 50 | 10,640 |
Makeup oil quarts | 0 | 0 | 1 |
Filter age miles | 3,000 | 50 | 10,640 |
Oil changed? | Yes | No | No |
Filter changed? | Yes | No | No |
Brand | OEM | HPL | HPL |
Viscosity | 0w-20 | 0w-20 Dexos D | 0w-20 Dexos D |
Wear Metals | (ppm/1k miles) | ||
Iron | 38(12.7) | 7(0) | 69(5.9) |
Chromium | <1 | <1 | 1 |
Nickel | <1 | <1 | <1 |
Titanium | <1 | <1 | 0 |
Silver | 6 | <1 | 5 |
Aluminum | 4 | 3 | 11 |
Lead | <1 | <1 | 0 |
Copper | 10 | 2 | 93 |
Tin | 2 | <1 | 4 |
Vanandium | <1 | <1 | 0 |
Cadmium | <1 | <1 | 0 |
Additives | |||
Boron | 40 | 106 | 70 |
Barium | 3 | 2 | 1 |
Molybdemum | 27 | 71 | 74 |
Manganese | 2 | <1 | 2 |
Magnesium | 15 | 876 | 1065 |
Calcium | 1781 | 1167 | 1387 |
Phosphorus | 879 | 798 | 769 |
Zinc | 927 | 821 | 907 |
Contaminants | (ppm/1k miles) | ||
Silicon | 104(35) | 23(0) | 44(2) |
Potassium | 5 | 3 | 2 |
Fuel % | <1 | <1 | <1 |
Glycol | NEG | NEG | NEG |
Soot% | 0.2 | 0.1 | 0.6 |
Fluid Condition | |||
TBN | 7.9 | 12.54 | 11.21 |
Viscosity | 8.2 | 8.9 | 9.1 |
Oxidation | 11.2 | 0(30) | 5.7(35.7) |
edit - filter video added Jan 10, 2025
I finally got around to adding this video of the filter media from the filter used during this run of oil. The oil was changed on Oct 12, 2024 with 12,100 miles on the oil and filter and 15,000 miles total on the engine. The flakes in this filter are more machining chips being scavenged from the engine. Again, it's disappointing that GM doesn't do a better job of cleaning the machining debris from these engines.
https://bobistheoilguy.com/forums/t...iles-65-total-hours-hpl-0w-20-dexos-d.382762/
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