Fluid was replaced at time of sample.
Make/Model: GM Differential (Front)
Vehicle: 2004 Chevrolet Tahoe
Oil Analysis Comments:
The front differential on this Tahoe appears to be in very good shape, with low wear metal readings giving us no reason to suspect any internal problems. Iron, indicative of steel wear, is exceptionally low for the miles. The oil tested to be in good condition, as well, with viscosity appropriate for 75W/90, and no sign of significant water or dirt contamination. Solids (insolubles) read low at 0.2%, indicating very little oxidation due to heat, and the TAN of 2.3 shows that little acidity built up. Feel free to try 60,000 miles next time and check back then to see the effects.
Code:
OIL Amsoil 75w90 Amsoil 75w90 Unknown
MILES IN USE 45,029 29,386 Unknown
MILES ON UNIT 203K 158K 123K
SAMPLE TAKEN 4/25/16 11/8/13 5/3/11
MAKE UP OIL 0 0 0
ALUMINUM 1 2 7
CHROMIUM 0 0 1
IRON 85 133 346
COPPER 3 5 8
LEAD 0 1 1
TIN 2 0 0
MOLYBDENUM 2 9 82
NICKEL 0 2 4
MANGANESE 1 2 5
SILVER 0 1 0
TITANIUM 0 0 1
POTASSIUM 0 1 0
BORON 106 95 89
SILICON 31 36 38
SODIUM 1 2 4
CALCIUM 6 12 80
MAGNESIUM 0 2 10
PHOSPHORUS 891 862 579
ZINC 22 41 90
BARIUM 0 0 1
SUS @ 210F 67.3 78.6 56.0
Visc @ 100C 12.23 15.16 9.07
Flashpoint 415 415 370
Water % 0.0 0.0 0.0
Insolubles % 0.2 0.2 0.3
TAN 2.3 1.7 NA
