Oil was changed at the time of sample. Cold air intake was installed at 216K miles that replaced the entire air intake assembly, including the MAF. Good news was that I haven't had any more MAF codes trip, but bad news is that it seems to have made no difference at all in silicon levels. Also sounds like with the streaks of lead, the engine may be getting ready to throw a bearing...
Make/Model: GM 5.3L V-8
Vehicle: 2004 Chevy Tahoe
Code:
OIL Ams ASL Ams ASL Ams ASL Ams ASL Ams ASL Ams ASL
MILES IN USE 9,129 9,213 10,045 9,037 9,246 8,124
MILES ON UNIT 224,106 214,977 205,764 195,719 186,682 177,436
SAMPLE TAKEN 7/14/17 1/2/17 7/15/16 12/14/15 6/29/15 11/30/14
MAKE UP OIL 0.5 0 0 0 0 0
ALUMINUM 4 3 4 3 4 3
CHROMIUM 0 1 1 0 0 0
IRON 13 12 15 11 12 9
COPPER 11 13 11 12 10 12
LEAD 24 11 22 13 30 7
TIN 0 0 0 0 5 0
MOLYBDENUM 141 138 130 143 160 144
NICKEL 1 1 1 2 1 0
MANGANESE 0 0 0 1 0 0
SILVER 0 0 0 0 0 0
TITANIUM 0 0 0 0 0 0
POTASSIUM 2 1 2 4 4 0
BORON 53 39 42 36 61 45
SILICON 29 28 30 35 28 31
SODIUM 9 9 11 10 9 9
CALCIUM 3039 3191 2928 3570 3461 3247
MAGNESIUM 13 13 13 17 14 12
PHOSPHORUS 558 648 558 655 627 702
ZINC 661 748 628 773 800 801
BARIUM 0 0 0 0 0 0
SUS @ 210F 64.4 63.8 68.8 66.0 62.6 64.6
Visc @ 100C 11.45 11.29 12.64 11.88 10.94 11.51
Flashpoint 445 445 400 410 420 430
Fuel %
Antifreeze % 0.0 0.0 0.0 0.0 0.0 0.0
Water % 0.0 0.0 0.0 0.0 0.0 0.0
Insolubles % 0.2 0.4 0.5 0.3 0.2 0.4
TBN 3.1 3.0 2.2 3.3 3.3 3.1
Blackstone Inc Comments:
Lead is back up in this report and in the past, we've attributed that to particle streaks here and there. That might be true, but looking at the overall trend, we could be seeing excess bearing wear. We typically see steady wear from healthy engines, so erratic trends can indicate trouble. We aren't ready to make that call here, especially since other metals look great, but lead is certainly something to watch. Monitor oil pressure in case it starts reading lower than usual. The thick viscosity is fine and the TBN was strong, but stay under 10K miles for now and check back.
Make/Model: GM 5.3L V-8
Vehicle: 2004 Chevy Tahoe
Code:
OIL Ams ASL Ams ASL Ams ASL Ams ASL Ams ASL Ams ASL
MILES IN USE 9,129 9,213 10,045 9,037 9,246 8,124
MILES ON UNIT 224,106 214,977 205,764 195,719 186,682 177,436
SAMPLE TAKEN 7/14/17 1/2/17 7/15/16 12/14/15 6/29/15 11/30/14
MAKE UP OIL 0.5 0 0 0 0 0
ALUMINUM 4 3 4 3 4 3
CHROMIUM 0 1 1 0 0 0
IRON 13 12 15 11 12 9
COPPER 11 13 11 12 10 12
LEAD 24 11 22 13 30 7
TIN 0 0 0 0 5 0
MOLYBDENUM 141 138 130 143 160 144
NICKEL 1 1 1 2 1 0
MANGANESE 0 0 0 1 0 0
SILVER 0 0 0 0 0 0
TITANIUM 0 0 0 0 0 0
POTASSIUM 2 1 2 4 4 0
BORON 53 39 42 36 61 45
SILICON 29 28 30 35 28 31
SODIUM 9 9 11 10 9 9
CALCIUM 3039 3191 2928 3570 3461 3247
MAGNESIUM 13 13 13 17 14 12
PHOSPHORUS 558 648 558 655 627 702
ZINC 661 748 628 773 800 801
BARIUM 0 0 0 0 0 0
SUS @ 210F 64.4 63.8 68.8 66.0 62.6 64.6
Visc @ 100C 11.45 11.29 12.64 11.88 10.94 11.51
Flashpoint 445 445 400 410 420 430
Fuel %
Antifreeze % 0.0 0.0 0.0 0.0 0.0 0.0
Water % 0.0 0.0 0.0 0.0 0.0 0.0
Insolubles % 0.2 0.4 0.5 0.3 0.2 0.4
TBN 3.1 3.0 2.2 3.3 3.3 3.1
Blackstone Inc Comments:
Lead is back up in this report and in the past, we've attributed that to particle streaks here and there. That might be true, but looking at the overall trend, we could be seeing excess bearing wear. We typically see steady wear from healthy engines, so erratic trends can indicate trouble. We aren't ready to make that call here, especially since other metals look great, but lead is certainly something to watch. Monitor oil pressure in case it starts reading lower than usual. The thick viscosity is fine and the TBN was strong, but stay under 10K miles for now and check back.