Dumped the oil at 9500 as suggested by Blackstone. I'm going to run a couple short OCI to see if I can get silicon lower and then try again to extend beyond 10K.
Make/Model: GM 5.3L V-8
Vehicle: 2004 Chevy Tahoe
Code:
OIL Ams SS Ams SS Ams SS 5w30 Ams SS 5w30 Ams SS 5w30 Ams SS 5W30 Ams SS 5w30
MILES IN USE 9,569 7,990 11,843 8,231 10,040 9,245 7,002
MILES ON UNIT 163,139 161,560 153,570 149,958 141,600 131,560 129,317
SAMPLE TAKEN 1/25/14 12/18/13 8/4/13 5/5/13 9/3/12 11/13/11 9/13/11
MAKE UP OIL 0 0 0 .25 0 0 0
ALUMINUM 5 5 5 3 4 3 3
CHROMIUM 1 0 1 0 1 1 0
IRON 18 15 25 15 18 16 11
COPPER 14 14 20 16 21 18 16
LEAD 14 12 59 13 48 16 10
TIN 0 0 1 0 5 0 1
MOLYBDENUM 132 132 143 134 140 149 130
NICKEL 1 1 1 0 1 1 0
MANGANESE 1 1 1 0 1 1 1
SILVER 0 0 0 0 0 0 0
TITANIUM 0 0 0 0 0 1 1
POTASSIUM 2 2 3 3 5 0 2
BORON 49 54 50 62 48 52 65
SILICON 25 25 40 26 38 46 38
SODIUM 10 10 18 14 26 67 61
CALCIUM 3195 3072 3404 3258 3252 3588 3270
MAGNESIUM 13 13 15 14 14 15 14
PHOSPHORUS 644 661 640 637 535 733 750
ZINC 690 692 726 715 616 840 932
BARIUM 0 0 0 0 0 0 0
CADMIUM 0
VANADIUM 0
ANTIMONY 0
LITHIUM 0
SUS @ 210F 62.9 62.2 65.3 62.1 62.3 59.1
Visc @ 100C 11.04 10.84 11.68 11.0 10.82 10.86 9.96
Flashpoint 445 420 440 435 435 435
Fuel %
Antifreeze % 0.0 0.0 0.0 ? ? 0.0
Water % 0.0 0.0 0.0
Insolubles % 0.6 0.3 0.3 0.2 0.3 0.3
TBN 2.4 2.8 1.1 3.36 1.9
Soot %
Oxidation 54
Nitration 15
Blackstone Inc Comments:
Another fine report for your Tahoe! You added about 1,500 miles to the previous fill, and yet your metals barely changed. Iron and lead came up slightly, but we've seen higher levels of both metals in the past, so these readings are nothing to be worried about. Silicon held steady, although we might have hoped that would drop some more. Insolubles went higher this time. Those are solids produced in the oil through heat and use, and they can be abrasive. The TBN is good at 2.4, but stick with ~10K miles on the oil for now. Check back for trends.
Make/Model: GM 5.3L V-8
Vehicle: 2004 Chevy Tahoe
Code:
OIL Ams SS Ams SS Ams SS 5w30 Ams SS 5w30 Ams SS 5w30 Ams SS 5W30 Ams SS 5w30
MILES IN USE 9,569 7,990 11,843 8,231 10,040 9,245 7,002
MILES ON UNIT 163,139 161,560 153,570 149,958 141,600 131,560 129,317
SAMPLE TAKEN 1/25/14 12/18/13 8/4/13 5/5/13 9/3/12 11/13/11 9/13/11
MAKE UP OIL 0 0 0 .25 0 0 0
ALUMINUM 5 5 5 3 4 3 3
CHROMIUM 1 0 1 0 1 1 0
IRON 18 15 25 15 18 16 11
COPPER 14 14 20 16 21 18 16
LEAD 14 12 59 13 48 16 10
TIN 0 0 1 0 5 0 1
MOLYBDENUM 132 132 143 134 140 149 130
NICKEL 1 1 1 0 1 1 0
MANGANESE 1 1 1 0 1 1 1
SILVER 0 0 0 0 0 0 0
TITANIUM 0 0 0 0 0 1 1
POTASSIUM 2 2 3 3 5 0 2
BORON 49 54 50 62 48 52 65
SILICON 25 25 40 26 38 46 38
SODIUM 10 10 18 14 26 67 61
CALCIUM 3195 3072 3404 3258 3252 3588 3270
MAGNESIUM 13 13 15 14 14 15 14
PHOSPHORUS 644 661 640 637 535 733 750
ZINC 690 692 726 715 616 840 932
BARIUM 0 0 0 0 0 0 0
CADMIUM 0
VANADIUM 0
ANTIMONY 0
LITHIUM 0
SUS @ 210F 62.9 62.2 65.3 62.1 62.3 59.1
Visc @ 100C 11.04 10.84 11.68 11.0 10.82 10.86 9.96
Flashpoint 445 420 440 435 435 435
Fuel %
Antifreeze % 0.0 0.0 0.0 ? ? 0.0
Water % 0.0 0.0 0.0
Insolubles % 0.6 0.3 0.3 0.2 0.3 0.3
TBN 2.4 2.8 1.1 3.36 1.9
Soot %
Oxidation 54
Nitration 15
Blackstone Inc Comments:
Another fine report for your Tahoe! You added about 1,500 miles to the previous fill, and yet your metals barely changed. Iron and lead came up slightly, but we've seen higher levels of both metals in the past, so these readings are nothing to be worried about. Silicon held steady, although we might have hoped that would drop some more. Insolubles went higher this time. Those are solids produced in the oil through heat and use, and they can be abrasive. The TBN is good at 2.4, but stick with ~10K miles on the oil for now. Check back for trends.
