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5w-40 oil analysis results

 
Old 12-21-2012, 11:21 AM
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Default 5w-40 oil analysis results - 3.8L UOA (0w-40 begins on page 15)

Aluminum (AL) 4 ppm
Iron (FE) 9 ppm
Copper (CU) 17 ppm
Lead (PB) 0 ppm
Tin (SN) 0 ppm
Chromium (CR) 0 ppm
Nickel 0 ppm
Cadmium 0 ppm
Silver 0 ppm
Vanadium 0 ppm
Silicon 9 ppm
Sodium 9 ppm
Water <0.1%
Soot <0.1%
Viscosity @ 100C 13.7 cSt [new oil reference, 13.7 cSt]
TBN 4.7 [new oil reference 8.0]

3300 mile UOA (used oil analysis) using 5w-40 (Amsoil AFL). The oil and filter are still in service, still plenty of life remaining. It's not a daily driver, the tested period included a wide range of driving -- From 4-Lo desert trails at 110 degrees, highway and city driving, and some snow this winter.

Comparing other 3.8 JK oil analysis I've found on the net, this is one of the best I've seen. It's noticeably quieter than 5w-20, and seems to run smoother -- both lugging at low RPM on a trail, and shifting quickly at 5000 RPM on a freeway on-ramp. No detectable reduction in MPG compared with 5W-20.

Bottom line is that this oil analysis with 5W-40 shows low wear, and that confirms a subjective opinion based on how it runs, sounds, as well as how clean the oil looks. Subjective opinions and arm-chair theories are not that reliable, but it's hard to argue with the numbers.

Edit: I've used Blackstone, but not for this particular analysis. One of the niceties of Blackstone is the "universal averages" for comparison in their reports. Below are some recent 3.8L averages for wear metals, similar can be found in this forum and others.
Al 4
Cr 1
Fe 17
Cu 21
Pb 1



EDIT: Over the years I've added subsequent analysis results to this thread, and the trend looks pretty good -- especially on a per mile basis since most of the oil change intervals are around 8000 miles. Here are links to some of the results.

5w-40 oil analysis results - Page 3
5w-40 oil analysis results - Page 4
5w-40 oil analysis results - Page 4
5w-40 oil analysis results - Page 6
5w-40 oil analysis results - Page 13

0w-40 oil analysis results - Page 15

Last edited by Mr.T; 11-23-2017 at 04:42 PM. Reason: Added viscosity & TBN, and changed title.
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Old 12-21-2012, 12:31 PM
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Keep posting subsequent oil analysis results. That's where the story is told.
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Old 12-21-2012, 12:50 PM
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Originally Posted by ronjenx View Post
Keep posting subsequent oil analysis results. That's where the story is told.
I know there have been some tests done on 10w-30 and like also. I've been using it and prefer it over the 5w-20 but i dont have any test analysis results to share.
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Old 12-21-2012, 01:44 PM
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Did they check TAN,TBN and viscosity? The first two will tell you your RUL (remaining useful life) the third will be checked at 40C or 100C and will tell you if contaminants (like soot) are affecting the oils ability to do its job. You can also do a business card dispersant test to see if your oil has reached its end of life. These all tell something different about the oils condition and whether it should be changed.
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Old 12-21-2012, 01:47 PM
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Originally Posted by zstairlessone View Post
Did they check TAN,TBN and viscosity? The first two will tell you your RUL (remaining useful life) the third will be checked at 40C or 100C and will tell you if contaminants (like soot) are affecting the oils ability to do its job. You can also do a business card dispersant test to see if your oil has reached its end of life. These all tell something different about the oils condition and whether it should be changed.
Edit: if the filter is doing its job don't extend the change interval for it (don't stretch it out) as it will bypass when differential pressure across the media becomes too great effectively removing the filter from the system - not a good thing, in case you are wondering
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Old 12-21-2012, 02:13 PM
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Originally Posted by Mr.T View Post
Aluminum (AL) 4 ppm
Iron (FE) 9 ppm
Copper (CU) 17 ppm
Lead (PB) 0 ppm
Tin (SN) 0 ppm
Chromium 0 ppm
Nickel 0 ppm
Cadmium 0 ppm
Silver 0 ppm
Vanadium 0 ppm
Water <0.1%
Soot <0.1%

3300 mile analysis using 5w-40 (Amsoil AFL). The oil and filter are still in service, still plenty of life remaining. It's not a daily driver, the tested period included a wide range of driving -- From 4-Lo desert trails at 110 degrees, highway and city driving, and some snow this winter.

Comparing other 3.8 JK oil analysis I've found on the net, this is one of (if not the best) I've seen. It's noticeably quieter than 5w-20, and seems to run smoother -- both lugging at low RPM on a trail, and shifting quickly at 5000 RPM on a freeway on-ramp. No detectable reduction in MPG compared with 5W-20.

Bottom line is that this oil analysis with 5W-40 shows extremely low wear, and that confirms a subjective opinion based on how it runs, sounds, as well as how clean the oil looks. Subjective opinions and arm-chair theories are not that reliable, but it's hard to argue with the numbers.
Ha!!! I can totally agree! I've been using the 0w-40 Mobil 1 in both of our Jk Rubicons 5,000 miles. Now at 17,000 miles on my JK and 15,000 on the wife's, they run quieter, smoother and no oil burning. I was laughed at on other Jeep forums and nobody believed me. IMO, these Mopar engines love the thicker oil at operating temp. Period.

To each his own.

Martin
Mine-2011 blk. Rubicon.
Hers-2011 slvr. Rubicon.
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Old 12-21-2012, 02:18 PM
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I'm in Oregon, but near Portland, so I don't get the weather extremes you may get if you are on the Eastern half of the state. I moved to 5w-30 synthetic: are you using 5w-40 because of the extreme temp differences where you live, or just to have a thicker oil...
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Old 12-22-2012, 10:39 AM
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Originally Posted by zstairlessone View Post
Did they check TAN,TBN and viscosity? The first two will tell you your RUL (remaining useful life) the third will be checked at 40C or 100C and will tell you if contaminants (like soot) are affecting the oils ability to do its job. You can also do a business card dispersant test to see if your oil has reached its end of life. These all tell something different about the oils condition and whether it should be changed.
TBN and viscosity @ 100 C added to first post, didn't pay the extra for TAN & viscosity @ 40 C.

The old Business card / white paper test -- I can tell you're old school too Oil analysis is expensive, but I've done it occasionally for many years. To me, it doesn't make economic sense to do it very often. I mostly justify it as insurance against a hidden failure that would really ruin the day (and night, or longer).

Speaking of insurance bets, that's mostly how I see 5w-20 vs synthetic 5W-40. 5w-20 is fine 99.x% of the time, but Murphy and his laws eventually show up. Something like a hot day, the electric fan quits or a coolant hose springs a leak, and the engine gets hot but you can't pull over in traffic going 75 MPH. It's these rare events that ruin most engines, not normal wear.
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Old 12-22-2012, 10:44 AM
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Originally Posted by BacasJK View Post
Ha!!! I can totally agree! I've been using the 0w-40 Mobil 1 in both of our Jk Rubicons 5,000 miles. Now at 17,000 miles on my JK and 15,000 on the wife's, they run quieter, smoother and no oil burning. I was laughed at on other Jeep forums and nobody believed me. IMO, these Mopar engines love the thicker oil at operating temp. Period.

To each his own.

Martin
Mine-2011 blk. Rubicon.
Hers-2011 slvr. Rubicon.
Yes, to each his own. Also, the wear metals were about 50% less with 5w-40 sample. Two samples don't prove anything, there's too many other variables, but I'd bet on less wear metals if I had too.
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Old 12-22-2012, 12:06 PM
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A single oil analysis is only good for a baseline and some even believe the first two are a baseline. In order to get the most amount of info, you need to keep testing at regular intervals to see the wear trends. Another very good thing to do is cut open your old oil filter and pour the contents into a paper coffee filter. Try to wash the filter element with a bit of solvent to get everything out and into the filter. If no metal in there it is OK, but any and I do mean any metal in that filter is bad news. The very first oil change will probably show a small amount of metal but that is normal. From there on out, no metal. What I have described it pretty must standard in the aircraft industry. That trend info can predict many things to include the expected lifetime of the engine or upcoming catastrophic failure..........
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