Oil was changed at the time of the sample. For the blackstone questions below.
Does the user this engine sees change significantly from sample to sample? No. Daily driver for the wife. Maybe more highway trips during the holiday season (Nov / Dec), but nothing else I can think of.
Hopefully this engine is running well with no unusual knocking noises or low oil pressure readings. No knocking noise, and no change in oil pressure. Still reads very strong.
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 9,088 9,129 9,213 10,045 9,037 9,246
MILES ON UNIT 233,194 224,106 214,977 205,764 195,719 186,682
SAMPLE TAKEN 2/24/18 7/14/17 1/2/17 7/15/16 12/14/15 6/29/15
MAKE UP OIL 0.5 0.5 0 0 0 0
ALUMINUM 6 4 3 4 3 4
CHROMIUM 1 0 1 1 0 0
IRON 18 13 12 15 11 12
COPPER 14 11 13 11 12 10
LEAD 10 24 11 22 13 30
TIN 1 0 0 0 0 5
MOLYBDENUM 168 141 138 130 143 160
NICKEL 1 1 1 1 2 1
MANGANESE 0 0 0 0 1 0
SILVER 0 0 0 0 0 0
TITANIUM 0 0 0 0 0 0
POTASSIUM 2 2 1 2 4 4
BORON 61 53 39 42 36 61
SILICON 37 29 28 30 35 28
SODIUM 10 9 9 11 10 9
CALCIUM 3168 3039 3191 2928 3570 3461
MAGNESIUM 127 13 13 13 17 14
PHOSPHORUS 778 558 648 558 655 627
ZINC 825 661 748 628 773 800
BARIUM 0 0 0 0 0 0
SUS @ 210F 65.9 64.4 63.8 68.8 66.0 62.6
Visc @ 100C 11.86 11.45 11.29 12.64 11.88 10.94
Flashpoint 450 445 445 400 410 420
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 % 0.3 0.2 0.4 0.5 0.3 0.2
TBN 3.0 3.1 3.0 2.2 3.3 3.3
Blackstone Inc Comments:
This trend in lead is awfully strange, but at least we're on the lower side of it this time. Does the user this engine sees change significantly from sample to sample? If so, maybe the up and down trend in bearing wear is partly due to that. It's certainly not a normal trend, but it is predictable and therefore hard to call a problem. Hopefully this engine is running well with no unusual knocking noises or low oil pressure readings. The TBN is fine and the slightly thick viscosity is not a problem. Check back in 10-11K miles on the oil.
Does the user this engine sees change significantly from sample to sample? No. Daily driver for the wife. Maybe more highway trips during the holiday season (Nov / Dec), but nothing else I can think of.
Hopefully this engine is running well with no unusual knocking noises or low oil pressure readings. No knocking noise, and no change in oil pressure. Still reads very strong.
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 9,088 9,129 9,213 10,045 9,037 9,246
MILES ON UNIT 233,194 224,106 214,977 205,764 195,719 186,682
SAMPLE TAKEN 2/24/18 7/14/17 1/2/17 7/15/16 12/14/15 6/29/15
MAKE UP OIL 0.5 0.5 0 0 0 0
ALUMINUM 6 4 3 4 3 4
CHROMIUM 1 0 1 1 0 0
IRON 18 13 12 15 11 12
COPPER 14 11 13 11 12 10
LEAD 10 24 11 22 13 30
TIN 1 0 0 0 0 5
MOLYBDENUM 168 141 138 130 143 160
NICKEL 1 1 1 1 2 1
MANGANESE 0 0 0 0 1 0
SILVER 0 0 0 0 0 0
TITANIUM 0 0 0 0 0 0
POTASSIUM 2 2 1 2 4 4
BORON 61 53 39 42 36 61
SILICON 37 29 28 30 35 28
SODIUM 10 9 9 11 10 9
CALCIUM 3168 3039 3191 2928 3570 3461
MAGNESIUM 127 13 13 13 17 14
PHOSPHORUS 778 558 648 558 655 627
ZINC 825 661 748 628 773 800
BARIUM 0 0 0 0 0 0
SUS @ 210F 65.9 64.4 63.8 68.8 66.0 62.6
Visc @ 100C 11.86 11.45 11.29 12.64 11.88 10.94
Flashpoint 450 445 445 400 410 420
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 % 0.3 0.2 0.4 0.5 0.3 0.2
TBN 3.0 3.1 3.0 2.2 3.3 3.3
Blackstone Inc Comments:
This trend in lead is awfully strange, but at least we're on the lower side of it this time. Does the user this engine sees change significantly from sample to sample? If so, maybe the up and down trend in bearing wear is partly due to that. It's certainly not a normal trend, but it is predictable and therefore hard to call a problem. Hopefully this engine is running well with no unusual knocking noises or low oil pressure readings. The TBN is fine and the slightly thick viscosity is not a problem. Check back in 10-11K miles on the oil.
