Will likely extend the next run to 55K based on Blackstone's recommendations. Overall looks like things are getting much better since we bought this one.
Make/Model: GM Differential
Vehicle: 2004 Chevrolet Tahoe
Code:
OIL SVG 75w90 SVG 75w90 SVG 75w90 Unknown
MILES IN USE 45,514 35,159 25,128 Unknown
MILES ON UNIT 229K 183K 148K 123K
SAMPLE TAKEN 10/29/17 4/16/15 3/18/13 5/3/11
MAKE UP OIL 0 0 0 0
ALUMINUM 1 2 3 4
CHROMIUM 0 1 1 2
IRON 102 264 255 672
COPPER 1 5 7 28
LEAD 0 0 0 1
TIN 0 0 0 0
MOLYBDENUM 0 1 0 3
NICKEL 2 4 4 11
MANGANESE 3 6 6 26
SILVER 0 0 0 0
TITANIUM 0 0 2 0
POTASSIUM 0 0 0 0
BORON 84 93 100 179
SILICON 81 145 162 13
SODIUM 4 5 6 34
CALCIUM 6 5 9 42
MAGNESIUM 0 2 3 3
PHOSPHORUS 745 884 913 1683
ZINC 5 13 21 68
BARIUM 0 0 0 1
SUS @ 210F 79.9 83.2 88.3 69.0
Visc @ 100C 15.50 16.31 17.57 12.70
Flashpoint 425 400 415 370
Water % 0.0 0.0 0.0 0.0
Insolubles % 0.2 0.2 0.5 0.2
TAN 2.6 1.4 1.8 NA
Blackstone comments:
This is the longest oil run across the page, so it's great to see iron so low. The other metals followed iron's example, so we don't see anything cautionary here. Silicon seems to be slowly washing out of the system. It's probably just additive or harmless sealer as opposed to abrasive dirt contamination. No moisture shows up and insolubles are very low. The viscosity is fine for 75W/90 and the TAN of 2.6 shows little acidity. Great report for your rear differential
Make/Model: GM Differential
Vehicle: 2004 Chevrolet Tahoe
Code:
OIL SVG 75w90 SVG 75w90 SVG 75w90 Unknown
MILES IN USE 45,514 35,159 25,128 Unknown
MILES ON UNIT 229K 183K 148K 123K
SAMPLE TAKEN 10/29/17 4/16/15 3/18/13 5/3/11
MAKE UP OIL 0 0 0 0
ALUMINUM 1 2 3 4
CHROMIUM 0 1 1 2
IRON 102 264 255 672
COPPER 1 5 7 28
LEAD 0 0 0 1
TIN 0 0 0 0
MOLYBDENUM 0 1 0 3
NICKEL 2 4 4 11
MANGANESE 3 6 6 26
SILVER 0 0 0 0
TITANIUM 0 0 2 0
POTASSIUM 0 0 0 0
BORON 84 93 100 179
SILICON 81 145 162 13
SODIUM 4 5 6 34
CALCIUM 6 5 9 42
MAGNESIUM 0 2 3 3
PHOSPHORUS 745 884 913 1683
ZINC 5 13 21 68
BARIUM 0 0 0 1
SUS @ 210F 79.9 83.2 88.3 69.0
Visc @ 100C 15.50 16.31 17.57 12.70
Flashpoint 425 400 415 370
Water % 0.0 0.0 0.0 0.0
Insolubles % 0.2 0.2 0.5 0.2
TAN 2.6 1.4 1.8 NA
Blackstone comments:
This is the longest oil run across the page, so it's great to see iron so low. The other metals followed iron's example, so we don't see anything cautionary here. Silicon seems to be slowly washing out of the system. It's probably just additive or harmless sealer as opposed to abrasive dirt contamination. No moisture shows up and insolubles are very low. The viscosity is fine for 75W/90 and the TAN of 2.6 shows little acidity. Great report for your rear differential