Oil was drained and replaced with another round of Amsoil SVG at time of sample. Nice to have a starting point since the first was the flush from the previous owner with unknown mileage/history.
Make/Model: GM Differential (Front)
Vehicle: 2004 Chevrolet Tahoe
Code:
OIL Amsoil 75w90 Unknown
MILES IN USE 29,386 Unknown
MILES ON UNIT 158K 123K
SAMPLE TAKEN 11/8/13 5/3/11
MAKE UP OIL 0 0
ALUMINUM 2 7
CHROMIUM 0 1
IRON 133 346
COPPER 5 8
LEAD 1 1
TIN 0 0
MOLYBDENUM 9 82
NICKEL 2 4
MANGANESE 2 5
SILVER 1 0
TITANIUM 0 1
POTASSIUM 1 0
BORON 95 89
SILICON 36 38
SODIUM 2 4
CALCIUM 12 80
MAGNESIUM 2 10
PHOSPHORUS 862 579
ZINC 41 90
BARIUM 0 1
SUS @ 210F 78.6 56.0
Visc @ 100C 15.16 9.07
Flashpoint 415 370
Water % 0.0 0.0
Insolubles % 0.2 0.3
TAN 1.7 NA
Oil Analysis Comments:
We're assuming this oil has been changed since the last sample, as wear metals and insolubles are reading a whole lot lower than last time. Nothing wrong with that. In fact, changing the oil has revealed excellent wear. This oil run is about as long as average, yet almost all wear metals are reading below average. We're not seeing any problems here. No moisture was found, and the viscosity was correct for a 75W/90 oil. The TAN was 1.7, showing little acidity in the oil. You could probably leave the next oil in 45,000 miles with no trouble. Check back then.
Make/Model: GM Differential (Front)
Vehicle: 2004 Chevrolet Tahoe
Code:
OIL Amsoil 75w90 Unknown
MILES IN USE 29,386 Unknown
MILES ON UNIT 158K 123K
SAMPLE TAKEN 11/8/13 5/3/11
MAKE UP OIL 0 0
ALUMINUM 2 7
CHROMIUM 0 1
IRON 133 346
COPPER 5 8
LEAD 1 1
TIN 0 0
MOLYBDENUM 9 82
NICKEL 2 4
MANGANESE 2 5
SILVER 1 0
TITANIUM 0 1
POTASSIUM 1 0
BORON 95 89
SILICON 36 38
SODIUM 2 4
CALCIUM 12 80
MAGNESIUM 2 10
PHOSPHORUS 862 579
ZINC 41 90
BARIUM 0 1
SUS @ 210F 78.6 56.0
Visc @ 100C 15.16 9.07
Flashpoint 415 370
Water % 0.0 0.0
Insolubles % 0.2 0.3
TAN 1.7 NA
Oil Analysis Comments:
We're assuming this oil has been changed since the last sample, as wear metals and insolubles are reading a whole lot lower than last time. Nothing wrong with that. In fact, changing the oil has revealed excellent wear. This oil run is about as long as average, yet almost all wear metals are reading below average. We're not seeing any problems here. No moisture was found, and the viscosity was correct for a 75W/90 oil. The TAN was 1.7, showing little acidity in the oil. You could probably leave the next oil in 45,000 miles with no trouble. Check back then.