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Old 12-12-2011, 08:26 PM   #1
kingme
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Default UOA: 2011 WRX Subaru Syn 5W-30

Engine mods
At 10K mi.: Catted turboback and protuned by BrenTuning for 316wtq/299whp.

At 31.5K mi.: FMS tmic, Walbro, Brentuned for 360wtq/323whp.

Driving conditions
Approx. 75% highway, 6 miles to work each day and long trips on the weekends (>400 miles).

I normally do 3,500 mile OCIs, it looks like that was unnecessary. Next UOA will be of Rotella T6 5W-40. I expect good results based on what I've read here. I'd like to know how the first owner broke the car in (owned since 11K mi.) because it burns absolutely no oil and this UOA looks pretty good.

The car has seen nothing but Subaru Synthetic 5W-30. I wanted to get a baseline with this UOA to compare with the switch to RT6.

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Last edited by kingme; 04-10-2012 at 09:44 AM. Reason: Updates
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Old 12-13-2011, 11:54 AM   #2
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This is good to read. I haven't performed a UOA in a while, but I've been using Subaru synthetic for the last 3-4 OCIs and am glad to see that it's a decent oil. The other thing I like about the Subaru oil is that it's the only 5-30 I've found that basically eliminates the annoying cold-start piston slap.
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Old 12-13-2011, 01:33 PM   #3
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If someone compared this to an early Subaru synthetic that I saw on an n/a Outback a year or so ago, they would probably accuse you of fraud and sneaking some unused oil into your sample. In that case the viscosity was a 20 grade and the TBN was shot. Actually, the TBN and viscosity is low in most uoa's on this oil.

I'm guessing that this is the API SM version since SoA didn't know as of this past September when it would be reformulated for SN/GF5. I wouldn't be surprised if Idemitsu has been quietly tinkering with this oil since it went on sale and made improvements to the base oil.

Good uoa, especially considering the weak-ish additive pack. Can't say that I would use this in your application though and I see that you've already switched. I would like to see some trending on this oil, but most people doing uoa's don't use it consistently.

-Dennis
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Old 12-13-2011, 02:08 PM   #4
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Looks good!
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Old 12-13-2011, 04:20 PM   #5
kingme
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Quote:
Originally Posted by Snomobile View Post
This is good to read. I haven't performed a UOA in a while, but I've been using Subaru synthetic for the last 3-4 OCIs and am glad to see that it's a decent oil. The other thing I like about the Subaru oil is that it's the only 5-30 I've found that basically eliminates the annoying cold-start piston slap.
I was a little hesitant about switching to a 40 weight oil right before winter, but I've heard no piston slap with the RT6 over the past few cold mornings. I guess the overall added protection I hope to get from this oil outweighs any concern I have about increased wear during cold starts.
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Old 12-13-2011, 04:32 PM   #6
kingme
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Quote:
Originally Posted by bluesubie View Post
If someone compared this to an early Subaru synthetic that I saw on an n/a Outback a year or so ago, they would probably accuse you of fraud and sneaking some unused oil into your sample. In that case the viscosity was a 20 grade and the TBN was shot. Actually, the TBN and viscosity is low in most uoa's on this oil.

I'm guessing that this is the API SM version since SoA didn't know as of this past September when it would be reformulated for SN/GF5. I wouldn't be surprised if Idemitsu has been quietly tinkering with this oil since it went on sale and made improvements to the base oil.

Good uoa, especially considering the weak-ish additive pack. Can't say that I would use this in your application though and I see that you've already switched. I would like to see some trending on this oil, but most people doing uoa's don't use it consistently.

-Dennis
Yep, those UOAs convinced me switch to RT6. I was really nervous about seeing this UOA after what I've read here so I was surprised with the results, especially TBN and viscosity. I like to think it's my driving habits and great tune that got me here . Will report back here with the RT6 UOA in another month or so.

Dennis, I've got a few qts of the Subaru stuff around, would there be any identifying marks on the bottle to indicate that it has been reformulated?
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Old 12-13-2011, 05:48 PM   #7
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SoA only recently started having the API spec added to the label. If it's SN, then it's brand new (not likely) and the recent oil is API SM. If it doesn't show the API spec then it's the earliest batch.

Oil companies do make formula adjustments, even while remaining in the same API spec, but there's no way to really know if that happens. Some companies state on the bottle that color may change if the formula changes. Sometimes you can tell if there are additive changes showing up in the uoa,

Sometimes Blackstone will run a free Virgin Oil Analysis for you so it will be interesting to know if there's a change between your oil and the next version. Send them an email and ask.

-Dennis
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Old 12-14-2011, 09:17 PM   #8
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Props to BrenTuning for doing a good job on the tune.
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Old 12-15-2011, 09:59 AM   #9
kingme
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Bren has a god-like reputation on New England Subaru Forums. I'll be going back to him in Jan. to get re-tuned for a Walbro, tmic and ebcs even though I live in NY and he's in Woostah MA .
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Old 01-31-2012, 09:52 PM   #10
kingme
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Default UOA: 2011 WRX - Rotella T6 5W-40 - 3K mi

For your entertainment .



Nothing to write home about. Pretty much what I expected for a 3K mi OCI on RT6. I wanted to get a baseline for this oil in my engine at 3K mi and see how far I can stretch it. I'll go for 5K on this one and report back. I'm very happy with this oil.

Oil geeks: Anything stand out to you?
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Old 01-31-2012, 10:17 PM   #11
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kingme,thanks for the post. im also running rotella t6. i was gonna change mine at 4k miles. im gonna wait until around 5 k by looking at your analysis. what does it cost for the blackstone oil test? id like to get mine done in the future. thanks.
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Old 01-31-2012, 10:32 PM   #12
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$25 for the standard test plus $10 for the optional TBN.

http://www.blackstone-labs.com/standard-analysis.php
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Old 02-01-2012, 05:43 PM   #13
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Boring. And that's a good thing. Although the viscosity did barely dip down to a 30 grade. And anyone doing a uoa should always get a TBN. Even though they're useful in deciding if you can extend your interval, sometimes a TBN will drop to 1 or 2 at 3,000 miles showing that the oil's ability to neutralize acids is pretty much done.

-Dennis
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Old 04-03-2012, 05:46 PM   #14
kingme
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Thumbs up

More of the same.

This sample was taken the day after I got dyno tuned for my FMS tmic. Engine saw 18 wot pulls to redline and a bunch on the road as Bren cleaned up the file. Honestly, I am shocked with the results. I thought for sure something would be different, especially the metals.

I think this one's a keeper



I have a bunch of Subaru syn 5W-30 lying around so the next UOA will be of 4 qts RT6 + 1 qt of Subaru's finest syn. Return soon for more exciting results lol
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Old 04-04-2012, 08:04 AM   #15
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Nice TBN so I would go to at least 5k on the next interval. Have you seen the RT6 extended drain uoa's popping up? What air filter are you running? It's doing a great job!

-Dennis
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Old 04-04-2012, 11:06 AM   #16
kingme
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Dennis - Yep, some nice results on those high mileage RT6 UOAs. I cut this one a bit short because of the dyno pulls. Next one will be 5K.

Stock air filter, changed at 30K service.
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Old 04-07-2012, 12:12 AM   #17
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Where can you buy the Subaru syn 5W-30 besides the dealer?
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Old 04-07-2012, 12:45 AM   #18
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Quote:
Originally Posted by natedogtown View Post
Where can you buy the Subaru syn 5W-30 besides the dealer?
you mean that you would actually WANT that garbage???
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Old 04-07-2012, 01:20 AM   #19
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Uh, yeah. It's what the dealers use.
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Old 04-07-2012, 08:43 AM   #20
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Quote:
Originally Posted by natedogtown
Uh, yeah. It's what the dealers use.
The point of the tread is that Subaru Synthetic Oil is junk..Read the sheets. I'm jumping on the Rotella wagon as soon as my motor build is done.
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Old 04-07-2012, 11:29 AM   #21
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All my friends use Mobil 1 in their WRX's. I guess Rotella is the way to go.
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Old 04-07-2012, 11:13 PM   #22
kingme
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Quote:
Originally Posted by SUBARIFFIC View Post
The point of the tread is that Subaru Synthetic Oil is junk..Read the sheets.
It's not JUNK so much as there are just cheaper, better, more readily available alternatives out there.

Quote:
Originally Posted by SUBARIFFIC View Post
I'm jumping on the Rotella wagon as soon as my motor build is done.
Smart, welcome .
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Old 04-07-2012, 11:20 PM   #23
kingme
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Quote:
Originally Posted by natedogtown View Post
Where can you buy the Subaru syn 5W-30 besides the dealer?
Nowhere. There are some random sites online that claim to sell it but I wouldn't send them my money.

The inconvenience of having to buy Subaru oil at the dealership was the catalyst for my switch to RT6.
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Old 10-26-2012, 12:20 AM   #24
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Hot off the presses.

Fuel dilution is up a bit, so flashpoint dropped. Silicon is also up, might be time to change the air filter (it was changed at 30K).

I'll continue doing UOA analysis every second or third oil change to get a trend over the life of the vehicle.


Last edited by kingme; 10-26-2012 at 12:29 PM.
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Old 10-26-2012, 01:02 PM   #25
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Silicon is fine IMO. Look around and you'll see a lot of uoa's with si in the double digits. What air filter are you using? And what oil filter? The insolubles are amazing!

FYI, Blackstone doesn't actually test for fuel but extrapolates the number based on the flashpoint. This means that the fuel dilution reading will always be a bit higher than BS shows.

-Dennis
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