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  #1  
Old 12-31-2008, 04:40 AM
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oil analysis and 17 mpg.

Amsoil 15-40 synthetic, 5k on oil, about 21k on engine, '07 6.0 E450 motorhome.

pentane insolubles 0.1%
water 0.1
dilution trace
glycol neg


iron 24ppm
silver 0.0
aluminum 3.0
chromium 2.6
copper 2.8
magnesium 3.7
sodium 45
nickle 6.5
lead 1.0
silicon 1.5
tin 15.0
titanium 0.0
boron 4.3
barium 0.9
molybdenum 4.6
vanadium 0.0
zinc 1216
manganese 1.4
calcium 3689
phosphorus 1107


I will admit to not really knowing what these numbers mean, the lab states that the results are similar to one year ago and that the wear is -low-

Is there a sub section here for the posting and discussion of results?

Oh, averaged 17 mpg while we were down in South Carolina last week; I love listening to the Sprinter crowd talk about how they get 'about 18 mpg......

too bad its on about 1/2 the horsepower of the 6.0 !!!!!!!!!!!!!!

Last edited by robert smith; 12-31-2008 at 04:55 AM.
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  #2  
Old 12-31-2008, 08:36 AM
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What was the viscosity?

I'm using the same oil, got a 10k mile sample to send in. Some say these engines shear oil, even amsoil, so am curious.
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Old 12-31-2008, 09:46 AM
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The first information you will need is the wear metals sheet from International. That will tell you what metals are important to watch for in the analysis. You can also call the company that did your analysis for a break down. thx
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Old 12-31-2008, 10:10 AM
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f350, I will look for the sheet by International-tnks.

snowman,

vis sus @ 210F 66.4 sec
vis kin @ 210F 11.98 cst


If anyone can tell me about these numbers I would appreciate it.

Just for giggles here are the numbers from the last time, same mileage but on Delvac 1 5-40; operating temps with the Del 1 sample would have been very similar as it was tested in June, so no hot weather driving.

vis sus @ 210F 68.1 sec
vis kin @ 210F 12.47

Petane insolubles 0.05%
water .3
dilution trace
glycol neg


iron 32ppm
silver 0.0
aluminum 2.4
chromium 2.1
copper 6.0
magnesium 470
sodium 5.4
nickel 0.8
lead 3.7
silicon 29
tin 0.1
titanium 0.0
boron 44
barium 0.9
molybdenum 4.7
vanadium 0.1
zinc 1390
manganese 0.6
calcium 2683
phosphrous 1280
silver 0.0
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Old 12-31-2008, 02:28 PM
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yeah im curious what the oil sheared to
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Old 01-01-2009, 04:27 AM
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The lab stated that in both samples the viscosity was 40wt and the only other values that I think refer to viscosity were the ones listed as sus/kin.
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Old 01-01-2009, 06:32 AM
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Quote:
Originally Posted by robert smith View Post
f350, I will look for the sheet by International-tnks.

snowman,

vis sus @ 210F 66.4 sec
vis kin @ 210F 11.98 cst


If anyone can tell me about these numbers I would appreciate it.
They are measuring the actual oil viscosity with two different tests. The first one measures in Saybolt Universal Seconds. The second measures kinematic viscosity and the units are centiStokes. You'll mostly see things in cSt. Based on this chart:
Viscosity Charts, 12cSt and 66sec are about at the line between 40w and 30w straight engine oil. Now assuming that I found the exact product you were using, the original viscosity should have been over 15 (AMSOIL - Synthetic 5W-40 Premium Diesel Oil (DEO), toward the bottom). So it would seem you've got some viscosity breakdown taking place. This might be exactly that shearing the others mentioned.

For the best insight into UOA, you get a virgin oil sample taken and tested and compare it to the used oil. Then test the used oil again at the end of your expected oil life and see what the progression is. Just google for VoA (Virgin Oil Analysis) and the type of oil you have to find if someone else did this for you already.

Basically, with UoA you're watching for some numbers that will increase (iron count, FDRS, FDRL, silicon, copper, tin, fuel dilution) and you don't want to see those numbers increasing rapidly or get too high. Since many of these elements are already in the oil, the VoA numbers are very important. Other numbers like TBN and viscosity will decrease, and the oil is considered "spent" when those numbers drop unacceptably low. To compare two oils, you pretty much have to repeat that whole process and keep operating conditions as similar as possible to compare the trends. Yeah, it's a lot of UoAs to be truly conclusive with this stuff.

Dave
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Old 01-02-2009, 03:09 AM
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Hi Dave, thank you for the info.

The oil was 15-40, AME which has a 14.2 value on the Amsoil site, how significant is the change to 11.98?

What I am really interested in now is the Delvac 1 change, does anyone have the numbers when the stuff is new?-perhaps now I can determine just how Del 1 compares to Amsoil AME.
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Old 01-02-2009, 03:17 AM
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Got it, Del 1 is 14.1 cst and the sample I had tested showed a 12.47 cst value.

So, which oil 'sheared' less and between the number sets which oil prevented wear the best??
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Old 01-02-2009, 03:41 AM
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They both held their viscosity very well in your 6.0L engine. Also - the oil reports really look pretty similar. Most folks say you have to run for 3 oil change intervals (OCIs) after switching oils before you get an analysis that really represents the oil you are currently on.

Is the Mobil Delvac the "ESP" oil or just plain Mobil Delvac 1?
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