Make/Model: Transmission GM 4L60E Auto
Vehicle: 2004 Chevrolet Tahoe
Fluid was changed during this recent sample and refilled with same fluid type.
Blackstone comments:
Since this oil is the same fill as last time (just with more use), it's not surprising we found some higher metals. Nothing came up so much that we're worried about developing issues, so it looks like this was another successful oil run. Internal parts don't show poor wear or anything that needs attention. The trace of insolubles is fine, and no contamination was found. At 3.4, the TAN shows some acitidy. Check back periodically over the next oil run to make sure all is well, and let's see if you can stretch the run out to 60K-70K miles next time. Keep up the good work!
Code:
OIL Amsoil ATF Amsoil ATF Amsoil ATF Amsoil ATF Amsoil ATF Unknown
MILES IN USE 50,151 34,469 24,251 15,030 10,010 Unknown
MILES ON UNIT 183K 167K 157K 148K 132K 122K
SAMPLE TAKEN 4/16/15 5/29/14 11/3/13 3/18/13 1/6/12 4/25/11
MAKE UP OIL 0 0 0 0 0 0
ALUMINUM 7 6 5 5 11 18
CHROMIUM 0 0 0 0 0 0
IRON 72 68 66 55 130 186
COPPER 92 73 63 49 93 129
LEAD 18 20 20 18 52 85
TIN 4 3 2 0 2 0
MOLYBDENUM 0 1 0 0 0 0
NICKEL 0 1 0 0 1 1
MANGANESE 1 1 1 1 3 4
SILVER 0 0 0 0 0 0
TITANIUM 0 0 0 0 0 0
POTASSIUM 0 5 0 0 0 0
BORON 206 226 224 222 159 76
SILICON 10 8 7 6 6 7
SODIUM 9 8 8 8 8 6
CALCIUM 212 222 226 221 165 98
MAGNESIUM 3 4 4 3 7 8
PHOSPHORUS 504 544 560 511 394 240
ZINC 16 21 14 13 22 22
BARIUM 0 0 0 0 0 0
SUS @ 210F 47.2 48 47.4 46.5 44.6 41.8
Visc @ 100C 6.41 6.66 6.46 6.19 5.61 4.74
Flashpoint 420 430 435 435 375 380
Water % 0.0 0.0 0.0 0.0 0.0 0.0
Insolubles % TR 0.0 0.0 TR 0.1 0.1
TAN 3.4 3.1 2.9 1.8 NA NA
Vehicle: 2004 Chevrolet Tahoe
Fluid was changed during this recent sample and refilled with same fluid type.
Blackstone comments:
Since this oil is the same fill as last time (just with more use), it's not surprising we found some higher metals. Nothing came up so much that we're worried about developing issues, so it looks like this was another successful oil run. Internal parts don't show poor wear or anything that needs attention. The trace of insolubles is fine, and no contamination was found. At 3.4, the TAN shows some acitidy. Check back periodically over the next oil run to make sure all is well, and let's see if you can stretch the run out to 60K-70K miles next time. Keep up the good work!
Code:
OIL Amsoil ATF Amsoil ATF Amsoil ATF Amsoil ATF Amsoil ATF Unknown
MILES IN USE 50,151 34,469 24,251 15,030 10,010 Unknown
MILES ON UNIT 183K 167K 157K 148K 132K 122K
SAMPLE TAKEN 4/16/15 5/29/14 11/3/13 3/18/13 1/6/12 4/25/11
MAKE UP OIL 0 0 0 0 0 0
ALUMINUM 7 6 5 5 11 18
CHROMIUM 0 0 0 0 0 0
IRON 72 68 66 55 130 186
COPPER 92 73 63 49 93 129
LEAD 18 20 20 18 52 85
TIN 4 3 2 0 2 0
MOLYBDENUM 0 1 0 0 0 0
NICKEL 0 1 0 0 1 1
MANGANESE 1 1 1 1 3 4
SILVER 0 0 0 0 0 0
TITANIUM 0 0 0 0 0 0
POTASSIUM 0 5 0 0 0 0
BORON 206 226 224 222 159 76
SILICON 10 8 7 6 6 7
SODIUM 9 8 8 8 8 6
CALCIUM 212 222 226 221 165 98
MAGNESIUM 3 4 4 3 7 8
PHOSPHORUS 504 544 560 511 394 240
ZINC 16 21 14 13 22 22
BARIUM 0 0 0 0 0 0
SUS @ 210F 47.2 48 47.4 46.5 44.6 41.8
Visc @ 100C 6.41 6.66 6.46 6.19 5.61 4.74
Flashpoint 420 430 435 435 375 380
Water % 0.0 0.0 0.0 0.0 0.0 0.0
Insolubles % TR 0.0 0.0 TR 0.1 0.1
TAN 3.4 3.1 2.9 1.8 NA NA