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

Joined
Jan 19, 2008
Messages
136
Location
Virginia, USA
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 %			<0.5		<0.5
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 .
 

Bookmaker

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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.
 
Joined
Oct 10, 2008
Messages
19,699
Location
Sunny Florida
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...
 
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Feb 12, 2013
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3,117
Location
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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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