PP5/20, 6071 miles, PP5/20

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5 speed corolla, Purolator L14477. Didn't feel like buying oil, so used the PP from the stash. Used the last of the PP to replace this.

I changed jobs recently, and the last UOA was about half on the new commute. This is the first OCI completely with my new commute which is very short and stop and go. I think that is why the last two have had trace fuel and the drop in gas mileage. Blackstone comments were pretty generic and useless.


OIL---------------PP5/20---4qtsYB5/30---YB5/30---YB5/30---PP5/20---PP5/20---?5/30
---------------------------.5qtPP5/20
MI/HR on Oil------6071-----5458-----5001-----4814-----5531-----4910-----3920
MI/HR on Unit-----36753----30682----25223----20222----15398----9867-----4957
Sample Date-------6/27/09--3/14/09--11/16/08-7/28/08--3/20/08--11/3/07--7/5/07
Make up Oil-------0--------0--------0--------0--------0--------0--------0
ALUMINUM----------4--------3--------1--------2--------3--------3--------3
CHROMIUM----------1--------1--------0--------0--------1--------0--------0
IRON--------------7--------5--------3--------5--------9--------8--------9
COPPER------------1--------1--------1--------1--------3--------11-------31
LEAD--------------1--------1--------1--------0--------2--------2--------1
TIN---------------0--------0--------1--------0--------0--------1--------4
MOLY--------------42-------4--------1--------8--------61-------53-------115
NICKEL------------0--------0--------0--------0--------0--------0--------0
MANGANESE---------0--------1--------0--------1--------1--------1--------1
SILVER------------0--------0--------0--------0--------0--------0--------0
TITANIUM----------0--------0--------0--------0--------0--------0--------0
POTASSIUM---------3--------1--------0--------3--------0--------1--------4
BORON-------------31-------82-------60-------68-------34-------24-------40
SILICON-----------8--------5--------6--------11-------15-------18-------53
SODIUM------------5--------2--------2--------4--------8--------32-------248
CALCIUM-----------2643-----1751-----1629-----2172-----2983-----2556-----1436
MAGNESIUM---------14-------13-------6--------10-------21-------16-------8
PHOSPHORUS--------637------593------536------684------710------664------585
ZINC--------------798------671------662------844------876------777------736
BARIUM------------0--------0--------0--------0--------0--------0--------2

SUS VISC. @ 210F--52.3-----52.8-----54.5-----53.2-----52.2-----52.5-----52.7
cST VISC. @ 100C--7.98-----8.13-----8.62-----8.24-----7.93-----8.03-----8.10
FLASHPOINT F------355------360------375------Short----390------385------385
FUEL %------------TR-------TR------- ANTIFREEZE %------0.0------0.0------0.0------0.0------0.0------?-------0.0
WATER-------------0.0------0.0------0.0------0.0------0.0------0.0-----0.0
INSOLUBLES--------0.3------.1-------0.3------0.3------0.2------0.1-----0.2
TBN---------------2.8------2.8------2.9------1.7------3.2------4.3-----2.9
 
Looks like YB gave just slightly better numbers. Still great numbers. Hope the jug of QS dino I bought at WW today protects like that.
 
Is it my imagination or is 5w30 keeping the iron number lower than 5w20?

What year is your Corolla?
 
Yes, 5W30 gives 0.85 ppm Fe per 1000 miles vs 1.47 for 5W20.
Significant difference, especially since end viscosity was the same.

There is also a difference in Pb, AL and Cr numbers but not as convincing as Fe.

Where is Elkpolk when we need him?
 
It is a 2007.

I find it difficult to draw any conclusions for multiple reasons. Is 2ppm really significant (noise)? Does changing oil chemistry effect reading (previous fill was YB)? Is the new short commute not long enough for the oil to warm up or the fuel to be burned off completely? Is the fact that I spend as much time idling at stop lights contributing to the trace fuel? Would YB or other conventional oil have done better given the conditions resulting in trace fuel? Guess I'll just have to keep monitoring it and finish off the YB I have in my stash for the next couple of runs to compare.

All in all I am still happy with the report given the conditions.
 
Looks good. Could go 7-8,000 miles there I think.

I see the Copper really took a nose dive quickly from the first one.
 
Last edited:
Originally Posted By: Artemedes

I find it difficult to draw any conclusions for multiple reasons. Is 2ppm really significant (noise)?


Well, there is a whole science devoted to answer that particular question.

It's called statistics. I plugged the Fe numbers in Excel and ran t-test (paired, one tailed) and the p value is 0.002933. So, the difference is VERY HIGHLY statistically significant. The results is so good you can publish it in peer review scientific journal.

This doesn't answer if the difference was due to viscosity, additives, base oil group, or service type. It could be all of the above.
 
I doubt that. The repeatability of the test itself isnt being factored in. If he asks them to re-run this sample, how much will it change? Now if iron jumped from 7 to 37 kind of like on my last UOA, I would call that significant.
 
Last edited by a moderator:
Originally Posted By: Onmo'Eegusee
I doubt that. The repeatability of the test itself isnt being factored in. If he asks them to re-run this sample, how much will it change? Now if iron jumped from 7 to 37 kind of like on my last UOA, I would call that significant.


Blackstone was found to have high testing precision. You can see it here: http://neptune.spacebears.com/cars/stories/margins.html

Sounds like your definition of significant is different from mine. I talked about statistical significance. You are talking about pragmatic significance. Semantics.
 
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