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Discussion Starter · #1 · (Edited)
According to my UOA, it says, “Flagged data does not indicate an immediate need for maintenance action. Continue to observe the trend and monitor equipment and fluid conditions. Viscosity is SLIGHTLY HIGH. Lubricant and filter change acknowledged.”

The entire UOA looked excellent accept the 12.5 Viscosity 100 *C. I had 76,442 miles on the engine and 10,268 miles on the oil interval at the time that it was sampled. I’m running the Amsoil HDD 5W30 and 14 quart capacity and 2 micron by-pass filter. What does “Viscosity is SLIGHTLY HIGH” mean?
 

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Take it over to BITOG and the inexpert "experts" can have a crack at it. More of them there than here.
 

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The layman answer is too viscous is bad.
The oils viscosity requirements are to ensure it stays where it needs to be before running off. Or to not be too thick and blow things like seals or resistance to flow.

I would take that as warm engine starts would have less lubrication than recommended. Ask them what they mean they are expert's. I always ask for interpretation.
 

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you're only at the top end of the 30 weight viscosity specs
nothing to worry about. the Amsoil 5w30 you're using starts high in the range to begin with. Cummins on extended engine oil runs thicken the oil from combustion products. your filtration is helping remove the carbon/soot. what's your soot count?

http://www.amsoil.com/storefront/hdd.aspx
AMSOIL Series 3000 Synthetic 5W-30 Heavy-Duty Diesel Oil (HDD)
Kinematic Viscosity @ 100°C, cSt (ASTM D-445) 11.7

http://www.tribology-abc.com/abc/viscosity.htm

Automotive Lubricant Viscosity Grades1Engine Oils – SAE J 300
30 oil—9.3<12.5

I'd be interested why you're running such an expensive oil in a Cummins?
oil change intervals OCIs mileage/hours?
ROI, free shipping, tax deduction or price cut for your business?

what's the max cold there in NM winters for 5w startup?
any heavy towing on the 5w30? percentage?

the first seconds on cold and hot starts is all about levels of E.xtreme P. and AntiWear additives that surface deposit on all the oiled moving metal to metal contact points in an engine. Know as boundary lubrication. Once oil reaches bearing surface in sufficient quantity, hydrodynamic lubrication takes over with oil film strength
http://www.bobistheoilguy.com/states-of-lubrication/
 
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