Amsoil SVG 75W90, 50K, 04 Duramax 196K

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Pretty happy with this one overall. Will extend it to 60K on the next run.

Make/Model: GM Rear Differential
Vehicle: 2004 Chevy 2500HD


Code:


OIL SVG 75w90 SVG 75w90 VAL Syn 75W90

MILES IN USE 50,070 39,780 29,976

MILES ON UNIT 196,200 146,130 106,350

SAMPLE TAKEN 8/16/16 7/3/13 10/20/11

MAKE UP OIL 0 0 0



ALUMINUM 2 0 2

CHROMIUM 0 0 1

IRON 77 99 170

COPPER 0 0 1

LEAD 1 0 1

TIN 0 0 0

MOLYBDENUM 0 0 0

NICKEL 0 2 2

MANGANESE 2 2 4

SILVER 0 0 0

TITANIUM 0 0 0

POTASSIUM 1 0 0

BORON 96 125 305

SILICON 22 15 4

SODIUM 3 3 4

CALCIUM 5 5 10

MAGNESIUM 1 0 2

PHOSPHORUS 829 893 2169

ZINC 7 10 17

BARIUM 0 0 0

CADMIUM 0

VANADIUM 0

ANTIMONY 0

LITHIUM 0



SUS @ 210F 86.0 76.2

Visc @ 100C 17.01 16.9 14.56

Flashpoint 410 375

Water % 0.0
Insolubles % 0.1 0.3

TAN 2.5 2.03

Oxidation 45

Nitration 4


Oil Analysis Vendor Comments:
The viscosity was a little thicker than expected in this sample, but if that was a problem for the differential, it certainly doesn't seem like it. Wear metals are lower than last time, depsite the longer run -- who can complain about that? No water turned up and insolubles read at just 0.1%. The TAN read 2.5. A longer interval should be no problem. Try about 60K miles for next time. Nice report!
 
With those numbers, I would go to 100K with Amsoil. Interesting to me is the Amsoil was used for 67% more miles than the Valvoline, yet the iron reading was 54% lower with the Amsoil. IMHO, Amsoil gear oil is arguably the best on the market.
 
No knowing what was done before the Valvoline fill makes those results worthless. If that was the first change of the diff oil then it's still washing out original wear particles.

Originally Posted By: 2015_PSD
With those numbers, I would go to 100K with Amsoil. Interesting to me is the Amsoil was used for 67% more miles than the Valvoline, yet the iron reading was 54% lower with the Amsoil. IMHO, Amsoil gear oil is arguably the best on the market.
 
Originally Posted By: KingCake
Vehicle mileage is source of your iron, not the valvoline.
How so? The Valvoline was used for 29,976 miles (not 106,350) and the Amsoil was used for 50,070 miles. What are you seeing that I am not?
 
Originally Posted By: Joshua_Skinner
No knowing what was done before the Valvoline fill makes those results worthless. If that was the first change of the diff oil then it's still washing out original wear particles.
Originally Posted By: 2015_PSD
With those numbers, I would go to 100K with Amsoil. Interesting to me is the Amsoil was used for 67% more miles than the Valvoline, yet the iron reading was 54% lower with the Amsoil. IMHO, Amsoil gear oil is arguably the best on the market.
Still washing out original wear particles after two OCs? While anything is possible, I doubt there were still original particles being washed out. The results from my retired 2010 F-150 show a similar pattern of less metal as time goes on. As you say, we cannot tell for certain, but it does seem strange.
 
Bad assumptions on the Valvoline and mileage. That was my 3rd fill with Valvoline Syn gear oil, bought the truck at 46K and had all fluids changed. Did another OCI at 76K. This was the 3rd and first time I did an analysis.
 
Originally Posted By: dhellman12
Bad assumptions on the Valvoline and mileage. That was my 3rd fill with Valvoline Syn gear oil, bought the truck at 46K and had all fluids changed. Did another OCI at 76K. This was the 3rd and first time I did an analysis.
In what way? Did you run the Valvoline for 29,976 total miles or no? If yes, then I am saying it seems strange for the Valvoline OC to generate 170ppm of iron but the Amsoil which was used for 50,070 and only produced 77ppm of iron. Since the OC that generated 170ppm of iron was the third OC on the axle, then it was not residual iron from the OEM fill. I fully understand that nothing absolute can be ascertained, but it makes one question if the Amsoil did a better job and if the numbers above are correct, then this is still true--the Amsoil was used for 67% more miles than the Valvoline, yet the iron reading was 54% lower with the Amsoil versus Valvoline.
 
Your posts were spot on. I was highlighting the previous posters regarding the 'worthless' first uoa, and claims that the lead must have been from high mileage.
 
Originally Posted By: dhellman12
Your posts were spot on. I was highlighting the previous posters regarding the 'worthless' first uoa, and claims that the lead must have been from high mileage.
Gotcha--thanks for the clarification.
 
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