Amsoil ATF, 30K, 04 Tahoe TCase

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This was the first run on Amsoil ATF after switching from the GM Auto-Trak II fluid. I'm not sure how to explain the really high insolubles or copper? Fluid was replaced with another fill of Amsoil ATF at the time of this sample.

Make/Model: GM Transfer Case (Rebuilt)
Vehicle: 2004 Chevy Tahoe

Code:


OIL Ams ATF GM AT II GM AT II

MILES IN USE 30,376 30,020 30,503

MILES ON UNIT 90,899 60,523 30,503

SAMPLE TAKEN 1/26/18 3/29/16 8/3/14

MAKE UP OIL 0 0 0



ALUMINUM 8 8 10

CHROMIUM 0 0 0

IRON 81 164 236

COPPER 46 23 24

LEAD 5 4 8

TIN 0 0 2

MOLYBDENUM 0 0 1

NICKEL 3 3 3

MANGANESE 60 17 16

SILVER 0 0 1

TITANIUM 1 1 1

POTASSIUM 0 2 0

BORON 265 60 28

SILICON 23 40 135

SODIUM 36 62 68

CALCIUM 227 55 38

MAGNESIUM 90 56 51

PHOSPHORUS 602 249 155

ZINC 123 148 212

BARIUM 0 1 3



SUS @ 210 49.1 56.0 47.2

cSt @ 100 7.00 9.07 6.41

FLASHPOINT 425 435 425

WATER % 0.0 0.0 0.0

INSOLUBLES % 0.9 0.1 0.1

TAN 0.9


Blackstone Comments:
This oil was in use about the same interval as the last and iron improved a lot. Aluminum and lead stayed steady, and copper doubled. Copper shows some extra brass/bronze wear, but with other metals in good shape, we aren't sure copper shows trouble. It's something to watch, but if the transfer case functions proprerly, let's just see how copper trends. Insolubles were quite high this time. 0.9% is a lot of solids so this was a good time to change this oil. Maybe those solids are related to the brass/bronze wear. Try ~30K miles again next time.
 
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