Chevron Supr, 5w-30 SN, 8k, Subaru EJ25 2.5L

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Jul 31, 2005
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From a 2007 Subaru Forester 2.5 naturally aspirated with 162K. I ran the oil to 8050 miles not by choice. I was a bit derelict in getting it changed. I had the external infamous head gasket leak and both HGs were replaced at 125k. This was my first UOA after that work a few years ago. This run was 75% open highway. I continue to be astounded how the plain Jane Chevron Supreme dino performs so well. With a TBN of 2.4 and viscosity holding up, I think 10k is doable. I don't see any use for syn other than cold startability. Filter was a PureOne. My air filter probably has 100k on it, I just keep cleaning it by hand. Si remains low.
 
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Awesome man.. Yeah Chevron Supreme is darn good oil. Too bad there is Zero to buy around where I am at. This one guy did his own tests on oils and Chevron Supreme was one of the best this guy tested.. Heck Havoline oils are very good too. I bet your Subaru will get 300k plus.. Awesome smile
 
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Sep 17, 2013
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Cascadia
Good lookin uoa! I just put 4qts of it in the Mazda in my sig, glad to see it treated your motor well for 8k. Good moly numbers too. Think I'll keep on using that stuff since it's always on sale!
 
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Fabulous UOA! Conventional oils get a bad wrap here by many members, while dnewton3 and Dave1251 continue to champion GrpII and how they are under utilized.
 
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Jan 2, 2015
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West MI
Great report! I am planning on getting a UOA in a couple of months when I change oil in my '02 Forester (also N/A 2.5L). Last couple detected potassium. (I had HG's done eventually.) Viscosity was under 9 at 100 degrees both times even though my OCI's were a little over 3k miles and I ran Kendall and Valvoline synthetic blends. But I'm normally at less than 50% highway. Plenty of short trips.
 

dsr70

Thread starter
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Jul 31, 2005
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One of my previous UOA posts, with 3 oils compared in the same engine: here Results below: QSUD = Quaker State Ultimate Durability, MS = Mobile Super 5000
Code:
OIL           Chev 5w30 SN        QSUD5w30 SN    MS 5w30 SN 
MILES IN USE  6500                7400           5700     
MILES         115k                102k           56k   
SAMPLE TAKEN  12/17/13            05/03/13       04/10/11  

ALUMINUM      3                   2              1        
CHROMIUM      0                   1              1        
IRON          6                   8              5       
COPPER        2                   3              2       
LEAD          0                   0              0         
TIN           1                   1              2        
MOLYBDENUM    148                 59             10       
NICKEL        0                   0              0        
MANGANESE     0                   1              0        
SILVER        0                   0              0        
TITANIUM      0                   0              24        
POTASSIUM     8                   4              0       
BORON         27                  11             5       
SILICON       12                  11             4        
SODIUM        5                   10             266       
CALCIUM       1852                2209           1686     
MAGNESIUM     42                  227            164      
PHOSPHORUS    658                 837            655      
ZINC          733                 1021           810     
BARIUM        0                   0              0
     
SUS VIS 210ºF   57.7              62.2         55.0        55-62 typ
cSt @ 100ºC     9.55              10.85        8.76        8.8-11.1 typ
FLASHPOINT ºF   425               425          385         >365
Fuel %          <0.5              <0.5         <0.5        <2.0
Antifreeze %    0.0               0.0          0.0         <0.1
Water %         0.0               0.0          0.0         <0.1
INSOLUBLES      0.2               0.3          0.2         <0.6
TBN             1.5               2.4          3.0  
 
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Al

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Jun 8, 2002
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Originally Posted By: Lubener
A great report with a great oil.
The EJ will get a good report on cat pee. It has nothing to do with the oil. IMHO I don't think I would push a dino oil above 8K miles. Thats just me. SuperTech would give you a great report even past 10K mile OCI.
 
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Conventionals are great and I'm unconvinced that syns lead to longer engine life. And 10000 miles on a conventional oil is great value per dollar spent. I don't think there's anything to gain by using a syn in this application unless planning to run a 20000 mile interval,which might even be doable. Thanks for posting.
 

CKN

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Oct 14, 2014
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Originally Posted By: Clevy
Conventionals are great and I'm unconvinced that syns lead to longer engine life. And 10000 miles on a conventional oil is great value per dollar spent. I don't think there's anything to gain by using a syn in this application unless planning to run a 20000 mile interval,which might even be doable. Thanks for posting.
There have been many posts from what I read that will agree with your statement that synthetics do not add to engine life, over just proper maintenance with a good conventional oil.
 
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Originally Posted By: CKN
Originally Posted By: Clevy
Conventionals are great and I'm unconvinced that syns lead to longer engine life. And 10000 miles on a conventional oil is great value per dollar spent. I don't think there's anything to gain by using a syn in this application unless planning to run a 20000 mile interval,which might even be doable. Thanks for posting.
There have been many posts from what I read that will agree with your statement that synthetics do not add to engine life, over just proper maintenance with a good conventional oil.
I completely agree. As long as a conventional oil isn't run too long there's nothing to be concerned about. Synthetic last longer in service and pump easier in extreme cold. They resist oxidation better too however that falls into the lasting longer in service category. I use syns because it costs me less per mile vs conventionals but I'd use conventionals if they cost me less. For me it boils down to dollars and cents. High output and engines operated in a high stress or severe duty may benefit from using a synthetic oil however most vehicles aren't operated as such and do just fine with less costly lubricant alternatives.
 
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Even many of today's family sedans and SUVs, which use turbo for the purpose of fuel economy and not the track, don't require a full synthetic and are doing just fine.
 
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Dec 26, 2007
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NC
dsr70, You can definitely go 10k miles with this engine and oil with your driving conditions. The 0.5-1qt makeup oil boosts TBN nicely. That Chevron is stout for sure.
 
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