PU 10w30 2008 Silverado 6.0L L76 9,083 miles on oil

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OLM was at 19%. Filter was NAPA Gold 7060.

Blackstone Comments:
Copper improved this time, but lead is going the other way. Lead might be a sign of bearing wear, so it's an important one to watch, but there's still a chance that the lead in your system is just coming from the new radiator you installed prior to the last sample, rather than any sort of bearing issue. Hard to say for sure at this point, but keep an eye on the oil pressure, and stick with 9,000-mile oil runs for now. If lead continues to increase, and especially if copper or other metals increase, it may be an issue. Hopefully, though, it will go away on its own soon.

Code:
MI on Oil 9,083 9,074

MI on Unit 135,057 125,974

Sample Date 10/11/14 06/15/14

Make Up Oil Added 0 qt .5 qt

Oil Type PU 10w30 PU 5w30



Universal Avgs

ALUMINUM 3 3 4

CHROMIUM 1 1 1

IRON 11 11 23

COPPER 30 53 48

LEAD 28 18 8

TIN 0 0 1

MOLYBDENUM 57 56 73

NICKEL 1 1 1

MANGANESE 1 1 1

SILVER 0 0 0

TITANIUM 2 2 2

POTASSIUM 1 2 2

BORON 27 33 51

SILICON 10 5 10

SODIUM 4 4 37

CALCIUM 2372 2113 2009

MAGNESIUM 33 29 335

PHOSPHORUS 727 659 738

ZINC 870 808 865

BARIUM 0 0 0



SUS Viscosity @ 210°F 60.8 58.8

cSt Viscosity @ 100°C 10.44 9.88

Flashpoint in °F 410 410

Fuel %
Antifreeze % 0.0 0.0

Water % 0.0 0.0

Insolubles 0.2 0.1

TBN N/A 3.2


The lead creeping up is a concern. The next UOA will show if it is trending upward.

Previous UOA is here .
 
Originally Posted By: brandini
Does your radiator pass engine oil? If not, they're smoking crack.


The radiator has a built-in engine oil cooler.
 
Yep, pretty hard to find many 6.0's that don't cool the oil that way.

We have raised and killed dozens of these in our fleet in a murderous duty cycle. They are extremely durable engines, just sold one with half a million miles on it that did not knock, smoke, or use oil.

No doubt the radiator is at fault here, solder will do that to ya...
 
If there was any kind of wear issue, I'd expect to see Fe a lot higher than 11ppm after 9k miles. Those engines are as bulletproof as it gets IMO. Thanks for posting.
 
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