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Used Oil Analysis - Post Them Here

Old 01-07-2010, 03:27 PM
  #101  
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Originally Posted by PhillipM View Post
That depends how far you drive each day, I used to do 4 hours of commuting per day, 5-6 if the traffic was bad...
Well derr!!!...

Yeah and a 4 hour commute can be 20 or 400 KMS
Forget it mate..you don't want to see what I am saying...typical POM
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Old 01-07-2010, 03:32 PM
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Originally Posted by SpIcEz View Post
Isnt most of the difference usually because of taxes?
I most countires that is found not to be the case..
Here about a third is Tax..
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Old 01-07-2010, 04:59 PM
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Originally Posted by ASH8 View Post
Well derr!!!...

Yeah and a 4 hour commute can be 20 or 400 KMS
Forget it mate..you don't want to see what I am saying...typical POM

The car's probably using just as much fuel if you're doing 5mph in rushhour traffic for 30 miles as it is on a long 60mph cruise for 100 miles....


Just because the country is bigger doesn't mean people travel for longer
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Old 01-07-2010, 05:10 PM
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TX

And to think I used to complain spending $400.00 a month on gas when I was doing an 80 mile a day commute. In your country it would have been $1200.00 a month
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Old 01-07-2010, 06:54 PM
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REDRX3RX8 was kind enough to share his UOA, take a look.
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Old 01-07-2010, 07:59 PM
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Interesting. Did anyone post results of dino diesel 15w40 oil with 3k+ miles? I saw that OD posted his results which held the viscosities in range, but that was only with 1k miles.

Also, is anyone running Mobil's synthetic diesel? What is the viscosity range, and is it a full "real" syn?
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Old 01-07-2010, 08:10 PM
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No but all UOA's are welcome and appreciated. Mine has been sent, I should get it soon.
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Old 01-07-2010, 08:39 PM
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Wink Oil viscosity in range

Oh, really?

What range viscosity do you want? Do you want the 7 to [email protected] 100C of 5w20 or the 15 to 16cst @ 100c of 20w50? Yeah, Mobil 1 0w40 spec sheet says approx [email protected], but thats just candy and nuts, and the specs show way over a 10w30. My report still had a some 5w20 and the usual fuel dump even though I was real careful to heat up car before sampling.

People that bring up (didn't stay in range) are have 40 year old info from Andy Granatelli selling STP viscosity improver. These new 0w oils get the weight from good chemistry buildup not just throwing in extra vi improver which can cause hard carbon.

Your knee seems a little jerky.
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Old 01-07-2010, 09:28 PM
  #109  
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Originally Posted by REDRX3RX8 View Post
Oh, really?

What range viscosity do you want? Do you want the 7 to [email protected] 100C of 5w20 or the 15 to 16cst @ 100c of 20w50? Yeah, Mobil 1 0w40 spec sheet says approx [email protected], but thats just candy and nuts, and the specs show way over a 10w30. My report still had a some 5w20 and the usual fuel dump even though I was real careful to heat up car before sampling.

People that bring up (didn't stay in range) are have 40 year old info from Andy Granatelli selling STP viscosity improver. These new 0w oils get the weight from good chemistry buildup not just throwing in extra vi improver which can cause hard carbon.

Your knee seems a little jerky.
This isn't the first UOA that I've seen showing the Mobile1 0w-40 thins out to a high 30w oil from the 40w range. Sure the fuel dilution didn't help but overall this oil does seem to lose a bit of it's viscosity over time.

Still, when we're talking about 1 to 2 cSt of viscosity loss that's really not a huge deal. Even less when you're looking at that loss occurring over 4,000 miles of use.

As for Diesel oil...just remember that oil choice comes down to application. You can run just about anything off the shelf in your motor and you'll be ok but some stuff is simply a better fit for how you use the car.
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Old 01-07-2010, 09:42 PM
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sorta like asking what car is best---well it depends. Use the uoa to develop your trend--dont take just a single reading.
uoa can be tricky.
OD
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Old 01-07-2010, 10:14 PM
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Originally Posted by Spirograph View Post
Interesting. Did anyone post results of dino diesel 15w40 oil with 3k+ miles? I saw that OD posted his results which held the viscosities in range, but that was only with 1k miles.

Also, is anyone running Mobil's synthetic diesel? What is the viscosity range, and is it a full "real" syn?
Take a look at my analysis I had done on 15W40 with 3k on it. It still was within range. There is a link to my post on the first page of this thread.
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Old 01-07-2010, 11:03 PM
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Take a look at my analysis I had done on 15W40 with 3k on it. It still was within range. There is a link to my post on the first page of this thread.
Dang dude, I missed that post. Thanks!!

Care to share your driving habits? Viscosity is low.


Last edited by 9krpmrx8; 01-07-2010 at 11:10 PM.
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Old 01-08-2010, 05:13 AM
  #113  
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TX rx8convert22 15w40

This uoa is from your 5w30 @ 14k, and with the usual excess fuel looks like 0w20. I saw your uoa on your Shell Rotella 15w40 diesel oil with 12.5 [email protected], and you have found your oil.

I know a guy in West Texas with the usual Chevy pu with 350 v8 that is still running at around 1/2 million miles without any internal work using Rotella 15w40.

You and olddragger are onto something because its over kill additives @ good price.

I run 0w40 Mobil 1 because it tests about 12cst @ 100c to maybe stop that front stationary bearing wear, and it tested the most hp and torque of many heavy weight in a dyno test.

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Old 01-08-2010, 06:00 AM
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Well, I'm still split between sticking with Rotella 15-40, and switching to Mobil1 0-40. But the good news is that they both sound solid for the Renesis. Maybe I'll run a 50/50 blend of the two.
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Old 01-08-2010, 11:21 AM
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Hey RX8Convert22, you mind if the mods merge our two threads? I didn't realize you had started one and there is some great info there as well.
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Old 01-08-2010, 11:32 AM
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Question: Shouldn't we be looking at wear metals in addition to viscosity, in order to get a better grip on the bearing wear issue?
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Old 01-08-2010, 01:53 PM
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yes.
and that SHOULD be viscosity related.
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Old 01-08-2010, 01:56 PM
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^and additive.
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Old 01-08-2010, 02:44 PM
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Originally Posted by olddragger View Post
yes.
and that SHOULD be viscosity related.
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Old 01-08-2010, 02:54 PM
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Wear metals were high in my GC 0W-30 and the were slightly higher in the 15W-40 vs. the Mobil1 0W-40 results posted by REDRX3RX8. I wish we could create some type of comparison chart for the renny. There are a lot of variables here.
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Old 01-08-2010, 04:16 PM
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It will take a tremendous amount of data to prove meaningful correlations between viscosity & bearing wear via UOA. Case in point, if I'm not mistaken, one of the reports on this thread with the lowest Iron content is somebody running Castrol 5w20.

I still think UOAs are good idea, and I'll post my results here soon. But, an enterprising person could start a spreadsheet and collect the data as it is entered, and over time we could, perhaps, begin to see trends.
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Old 01-08-2010, 05:38 PM
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yep--- its more trend related for that particular engine that on a unified grand scale of things.
With enough data maybe some specific cooralation could be done--but yes i agree it would take a lot.

One thing I believe that has already become apparent ---the viscosity showings are mostly so far not standing up as some may think?
The flash points are lower than some may think also?
When it comes to wear metals---a LOT has to taken into consideration--including air filtration
driving enviroment, temps, adverage load on engine etc. I know you can make a case on the same affecting viscosity and it does but you can have wear metals without viscosity probs but not the otherway around?
OD
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Old 01-08-2010, 06:27 PM
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Originally Posted by GeorgeH View Post
It will take a tremendous amount of data to prove meaningful correlations between viscosity & bearing wear via UOA. Case in point, if I'm not mistaken, one of the reports on this thread with the lowest Iron content is somebody running Castrol 5w20.

I still think UOAs are good idea, and I'll post my results here soon. But, an enterprising person could start a spreadsheet and collect the data as it is entered, and over time we could, perhaps, begin to see trends.
Once again George thank you for being a voice of reason.
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Old 01-08-2010, 07:02 PM
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Ok Fellas!! Got a present today.

Last edited by 9krpmrx8; 01-08-2010 at 11:43 PM.
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Old 01-08-2010, 10:44 PM
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nice Z&P levels.
and this is a synthetic --right?
i dont have the ability to scan mine in but i will type it out

Brand new engine
oil use interval 2K (after the 1st 500 miles with break in OIL)
diesel oil 15w/40
al--1
chr-5
iron-19
copper-2
lead-15
tin-1
moly-12
nickel 1
magenese 0
silver--0
Titanium and potasium --o
boron--44
silicon--10
sodium 6
calcium 1098
manesium-620
phos-912
zinc--1050
barium-0

sub viscosity at 210F = 61.0 should be 70-81
cST vis at 100C =10.50 --should be 12.9-16
flashpoint 355 should be greater than 390
fuel % 1.8%

not too bad for a new engine.
next will be maybe in 2 weeks and i am waiting to see if my higher oil temps have improved the fuel percentage.
OD
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