During this drain/fill I went ahead and install the TCase Pump Upgrade Kit from Merchant Automotive. Hoping this will help ensure a long and healthy life for my transfer case. The Amsoil seems to have held up better than the Maxlife, although the numbers are still not quite as good as I'd like. Hopefully next round will be better.
Make/Model: GM Transfer Case
Vehicle: 2004 Chevy 2500HD
Code:
OIL Ams ATF Maxlife
MILES IN USE 48,337 49.981
MILES 148,629 99,996
SAMPLE TAKEN 8/14/13 7/19/11
ALUMINUM 12 23
CHROMIUM 0 0
IRON 57 89
COPPER 38 50
LEAD 39 84
TIN 0 0
MOLYBDENUM 0 1
NICKEL 3 9
MANGANESE 28 37
SILVER 1 0
TITANIUM 0 0
POTASSIUM 3 2
BORON 261 109
SILICON 8 14
SODIUM 8 10
CALCIUM 260 271
MAGNESIUM 131 246
PHOSPHORUS 614 328
ZINC 6 21
BARIUM 0 1
SUS @ 210 49.8 44.9
cSt @ 100 7.21 5.68
FLASHPOINT 455 385
WATER % 0.0 0.0
INSOLUBLES % 0.1 0.2
TAN 1.9
Oil Analysis Comments: Lead improved in this most recent sample from your GM transfer case, and insolubles look a lot better too. Neither of them are quite where we want them to be yet, but any improvement is a plus. All the other wear metals look great -- also dropping a lot since last time. This was a slightly shorter run, but those decreases are too big to say it's just from fewer miles on the oil. The mechanical parts did wear better this time. The TAN was 1.9. With the improvements here, it's probably okay to run the oil out to 55,000-60,000 miles next.
Make/Model: GM Transfer Case
Vehicle: 2004 Chevy 2500HD
Code:
OIL Ams ATF Maxlife
MILES IN USE 48,337 49.981
MILES 148,629 99,996
SAMPLE TAKEN 8/14/13 7/19/11
ALUMINUM 12 23
CHROMIUM 0 0
IRON 57 89
COPPER 38 50
LEAD 39 84
TIN 0 0
MOLYBDENUM 0 1
NICKEL 3 9
MANGANESE 28 37
SILVER 1 0
TITANIUM 0 0
POTASSIUM 3 2
BORON 261 109
SILICON 8 14
SODIUM 8 10
CALCIUM 260 271
MAGNESIUM 131 246
PHOSPHORUS 614 328
ZINC 6 21
BARIUM 0 1
SUS @ 210 49.8 44.9
cSt @ 100 7.21 5.68
FLASHPOINT 455 385
WATER % 0.0 0.0
INSOLUBLES % 0.1 0.2
TAN 1.9
Oil Analysis Comments: Lead improved in this most recent sample from your GM transfer case, and insolubles look a lot better too. Neither of them are quite where we want them to be yet, but any improvement is a plus. All the other wear metals look great -- also dropping a lot since last time. This was a slightly shorter run, but those decreases are too big to say it's just from fewer miles on the oil. The mechanical parts did wear better this time. The TAN was 1.9. With the improvements here, it's probably okay to run the oil out to 55,000-60,000 miles next.