Code:
OIL Mobil 1 5w30
MILES IN USE 6,037 5,606 5,467 4,645 3,286 5,996 5,862 6,186
MILES 44,085 38,048 32,442 26,976 22,330 19,044 13,048 7,186
SAMPLE TAKEN 02/20/12 10/01/11 6/19/11 4/2/11 12/11/10 10/24/10 5/22/10 2/17/10
Make up oil 1qt 1qt 1qt 1qt 0 0 0 0
ALUMINUM 6 4 4 6 4 5 4 4
CHROMIUM 2 1 1 2 1 2 2 2
IRON 32 19 28 30 18 28 24 44
COPPER 59 53 58 76 72 142 128 235
LEAD 10 9 12 9 9 26 10 7
TIN 0 0 0 0 0 1 0 1
MOLYBDENUM 87 81 125 114 130 105 113 127
NICKEL 3 1 2 2 1 2 2 3
MANGANESE 3 2 1 2 2 5 3 9
SILVER 0 0 0 0 0 0 0 0
TITANIUM 0 0 0 0 0 0 0 0
POTASSIUM 5 0 0 1 2 2 4 1
BORON 26 33 58 53 63 49 49 61
SILICON 9 10 11 8 13 18 18 29
SODIUM 33 11 11 16 8 7 7 8
CALCIUM 1124 1232 2501 2484 2463 2559 2516 2494
MAGNESIUM 784 625 14 13 13 13 11 12
PHOSPHORUS 694 654 715 688 691 684 671 716
ZINC 776 670 812 699 773 719 875 862
BARIUM 0 0 0 0 0 0 0 0
SUS VIS 210ºF 55.5 57.6 57.2 55.1 58.3 56.2 57.4 58.3
cSt @ 212ºF 8.92 9.54 9.41 8.80 9.72 9.11 9.46 9.74
FLASHPOINT ºF 385 380 420 350 360 385 400 415
WATER 0 0 0 0 0 0 0 0
INSOLUBLES 0.5 0.2 0.3 0.3 0.3 0.4 0.3 0.3
2/17
This is a brand-new engine, so the high wear and silicon are normal. The high wear metals are from break-in of new parts, while silicon is from sand-casted parts and sealers used when building your engine. Everything will improve with subsequent oil changes. No moisture, fuel, or coolant found. Insolubles, which are solids formed by oil oxidation, were low at 0.3%, showing good oil filtration. Universal averages are based on an oil run of 6K miles. We suggest using 6K miles next time. This is going to be a nice engine for you. This is indeed Mobil 1 oil.
5/28
Engine wear was better at 13,048 miles (351.7 hours). Iron, copper, tin and nickel decreased while aluminum and chrome stayed the same and lead went up a bit. All wear metals, except copper, read near universal averages, which are based on 6,000 miles (~150 hours) of oil use. Copper will gradually decrease but make take another 15,000 miles before it drops into the 30 ppm range. Silicon (lubes/sealers) is washing out of the system nicely and should drop in the next sample. Oil filtration looked normal. Try 7K-miles for your next oil sample.
11/3
The increase in copper and lead could show a bearing issue developing in this report from your 2009 Silverado. It is unusual for a bearing problem to develop at just 19,044 miles (564.1 hours) on an engine, so it's possible that the excess wear has another source. The lead could be from a particle streak through the bearings, and if so it would drop to normal next time. The lead could also be from a bit of leaded fuel or a fuel system additive. If your engine is running okay, keep an eye on your oil pressure and check back in 4,000-5,000 miles to monitor.
12/17
The wear rate of lead improved nicely this sample, though copper didn't improve as much as we were hoping for. This is only the fourth oil change for this engine, so it's possible this is some lingering wear in at 656 total engine hours, though at this point we can't eliminate unusual wear at brass/bronze parts as a possibility. We'll give this engine the benefit of the doubt for one more oil change, and hopefully copper will continue to decrease. A trace (TR) of fuel was present in this sample, though that level doesn't usually cause any excess wear. Check back.
4/8
Thanks for the note on the oil use. That doesn't seem like an excessive amount, but it is a change from your previous reports, so it's worth mentioning. Have you asked your dealer about it? We don't see any excessive ring wear, which would show up as chrome, but copper is still fairly high. We've been attributing it to residual wear-in stuff, but maybe we're wrong about that. No antifreeze or water was present, and fuel is okay at 0.8%. We think this is a good report. Let us know what you find about oil use.
6/28
Well it's sure taken a while but finally at 980 total hours it looks like the last vestiges of wear-in are finally washing out of this GM V-8. It's not unusual to see copper linger for a while, especially in these big V-8's. It's not a problem, but it sure is nice to finally be able to give this engine a clean bill of health. To be sure, copper will likely continue to improve over another oil change or to, but it's now low enough that we don't have to highlight it anymore. Also nicely improved this time is fuel. With all else holding steady, we think this engine is doing well.
10/11
This engine is looking good at 1,162 hours. Wear metals compare well with universal averages overall and a few of the metals actually improved a little. That's always nice to see. If there's anything worth noting, copper is still a little on the high side, though it doesn't seem to be hurting anything and it might just be the way this particular engine wears. No fuel or coolant was found and low insolubles and silicon show excellent oil and air filtration. Nice report and engine at 38,048 miles1,162 hours.
3/2
The additive levels will vary from sample to sample--they're never exactly the same, even coming from the same bottle. Calcium and magnesium both changed significantly in the last sample, which leads us to believe that you switched to a different type of Mobil 1 5W/30 oil (Extended Performance, High Mileage, etc.). Copper (brass/bronze parts) is still a little high, and potassium and sodium could show a little antifreeze. The two may be related. Monitor the coolant level and resample in 5K-6K miles to watch for coolant. This sample was taken at 1,374 hours.
Thoughts?
OIL Mobil 1 5w30
MILES IN USE 6,037 5,606 5,467 4,645 3,286 5,996 5,862 6,186
MILES 44,085 38,048 32,442 26,976 22,330 19,044 13,048 7,186
SAMPLE TAKEN 02/20/12 10/01/11 6/19/11 4/2/11 12/11/10 10/24/10 5/22/10 2/17/10
Make up oil 1qt 1qt 1qt 1qt 0 0 0 0
ALUMINUM 6 4 4 6 4 5 4 4
CHROMIUM 2 1 1 2 1 2 2 2
IRON 32 19 28 30 18 28 24 44
COPPER 59 53 58 76 72 142 128 235
LEAD 10 9 12 9 9 26 10 7
TIN 0 0 0 0 0 1 0 1
MOLYBDENUM 87 81 125 114 130 105 113 127
NICKEL 3 1 2 2 1 2 2 3
MANGANESE 3 2 1 2 2 5 3 9
SILVER 0 0 0 0 0 0 0 0
TITANIUM 0 0 0 0 0 0 0 0
POTASSIUM 5 0 0 1 2 2 4 1
BORON 26 33 58 53 63 49 49 61
SILICON 9 10 11 8 13 18 18 29
SODIUM 33 11 11 16 8 7 7 8
CALCIUM 1124 1232 2501 2484 2463 2559 2516 2494
MAGNESIUM 784 625 14 13 13 13 11 12
PHOSPHORUS 694 654 715 688 691 684 671 716
ZINC 776 670 812 699 773 719 875 862
BARIUM 0 0 0 0 0 0 0 0
SUS VIS 210ºF 55.5 57.6 57.2 55.1 58.3 56.2 57.4 58.3
cSt @ 212ºF 8.92 9.54 9.41 8.80 9.72 9.11 9.46 9.74
FLASHPOINT ºF 385 380 420 350 360 385 400 415
WATER 0 0 0 0 0 0 0 0
INSOLUBLES 0.5 0.2 0.3 0.3 0.3 0.4 0.3 0.3
2/17
This is a brand-new engine, so the high wear and silicon are normal. The high wear metals are from break-in of new parts, while silicon is from sand-casted parts and sealers used when building your engine. Everything will improve with subsequent oil changes. No moisture, fuel, or coolant found. Insolubles, which are solids formed by oil oxidation, were low at 0.3%, showing good oil filtration. Universal averages are based on an oil run of 6K miles. We suggest using 6K miles next time. This is going to be a nice engine for you. This is indeed Mobil 1 oil.
5/28
Engine wear was better at 13,048 miles (351.7 hours). Iron, copper, tin and nickel decreased while aluminum and chrome stayed the same and lead went up a bit. All wear metals, except copper, read near universal averages, which are based on 6,000 miles (~150 hours) of oil use. Copper will gradually decrease but make take another 15,000 miles before it drops into the 30 ppm range. Silicon (lubes/sealers) is washing out of the system nicely and should drop in the next sample. Oil filtration looked normal. Try 7K-miles for your next oil sample.
11/3
The increase in copper and lead could show a bearing issue developing in this report from your 2009 Silverado. It is unusual for a bearing problem to develop at just 19,044 miles (564.1 hours) on an engine, so it's possible that the excess wear has another source. The lead could be from a particle streak through the bearings, and if so it would drop to normal next time. The lead could also be from a bit of leaded fuel or a fuel system additive. If your engine is running okay, keep an eye on your oil pressure and check back in 4,000-5,000 miles to monitor.
12/17
The wear rate of lead improved nicely this sample, though copper didn't improve as much as we were hoping for. This is only the fourth oil change for this engine, so it's possible this is some lingering wear in at 656 total engine hours, though at this point we can't eliminate unusual wear at brass/bronze parts as a possibility. We'll give this engine the benefit of the doubt for one more oil change, and hopefully copper will continue to decrease. A trace (TR) of fuel was present in this sample, though that level doesn't usually cause any excess wear. Check back.
4/8
Thanks for the note on the oil use. That doesn't seem like an excessive amount, but it is a change from your previous reports, so it's worth mentioning. Have you asked your dealer about it? We don't see any excessive ring wear, which would show up as chrome, but copper is still fairly high. We've been attributing it to residual wear-in stuff, but maybe we're wrong about that. No antifreeze or water was present, and fuel is okay at 0.8%. We think this is a good report. Let us know what you find about oil use.
6/28
Well it's sure taken a while but finally at 980 total hours it looks like the last vestiges of wear-in are finally washing out of this GM V-8. It's not unusual to see copper linger for a while, especially in these big V-8's. It's not a problem, but it sure is nice to finally be able to give this engine a clean bill of health. To be sure, copper will likely continue to improve over another oil change or to, but it's now low enough that we don't have to highlight it anymore. Also nicely improved this time is fuel. With all else holding steady, we think this engine is doing well.
10/11
This engine is looking good at 1,162 hours. Wear metals compare well with universal averages overall and a few of the metals actually improved a little. That's always nice to see. If there's anything worth noting, copper is still a little on the high side, though it doesn't seem to be hurting anything and it might just be the way this particular engine wears. No fuel or coolant was found and low insolubles and silicon show excellent oil and air filtration. Nice report and engine at 38,048 miles1,162 hours.
3/2
The additive levels will vary from sample to sample--they're never exactly the same, even coming from the same bottle. Calcium and magnesium both changed significantly in the last sample, which leads us to believe that you switched to a different type of Mobil 1 5W/30 oil (Extended Performance, High Mileage, etc.). Copper (brass/bronze parts) is still a little high, and potassium and sodium could show a little antifreeze. The two may be related. Monitor the coolant level and resample in 5K-6K miles to watch for coolant. This sample was taken at 1,374 hours.
Thoughts?
