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Old 03-05-2013, 03:16 PM   #1
some dude
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Default 2006 WRX 3 UOAs Mobil 1 and T6

I just got the results back from my latest UOA. I went 8,700 miles on Rotella T6 and ended up with a TBN of 2.6. Here is a link to the 3 analysisezesss.
149k on the original engine. The first analysis (2008-2009) I did was Mobil 1 5w-30. The last 2 have been T6.


https://docs.google.com/file/d/0B2ti...it?usp=sharing
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Last edited by some dude; 03-05-2013 at 03:22 PM.
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Old 03-05-2013, 04:41 PM   #2
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A bit of a copper spike in the M1 UOA, but otherwise it held up really well. 10 cSt is really thick for API SM M1 5w30. (I presume it was SM given the date)

How do you drive? Lots of highway miles?

I wouldn't run RT6 much longer than 9k mi, you could probably get away with 10k for a nice round OCI number. It "should" have sheared to ~13 cSt, so 14.5 cSt indicates it's actually getting thicker either due to insolubles in suspension, or oxidation or both. Otherwise, great numbers!
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Old 03-05-2013, 05:03 PM   #3
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T6 is a great oil, but the 5w-30 M1 isn't really well suited for our motors. If you're a brand fan and want to continue using M1, try their 0w-40 oil. It's built up from a completely different base stock and I believe is a G-IV synthetic instead of the "fake" G-III synthetic that the 5w-30 is based on. People have gotten very very good results with the 0w-40 - in fact, it's additive pack is so potent that a lot of people add +1 quart of the 0w-40 to other oils solely for it's additive pack.

If you live near an Autozone, you might want to consider getting Castrol 0w-30. It's a PAO/Ester based G-IV synthetic which you can get 5 quarts + filter for $32 when it's on sale, which is a killer deal. Usually it goes on sale for 3 months, then they rotate some other oil for 3 months, and then the Castrol goes back on sale again.

I have used a lot of oils before, including T5, T6, M1 5w-30, 0w-40, Castrol 0w-30, and a few more I can't remember. The Castrol 0w-30 has by far been the best oil to run in the STi.

I used 5000mi intervals and oil analysis claims the oil should be good for around 8k. My Volvo does 8k intervals with the same oil (4.4L V8) and it runs great - it's oil is also analyzed.
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Old 03-05-2013, 06:23 PM   #4
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Quote:
Originally Posted by gpshumway View Post
A bit of a copper spike in the M1 UOA, but otherwise it held up really well. 10 cSt is really thick for API SM M1 5w30. (I presume it was SM given the date)

How do you drive? Lots of highway miles?

I wouldn't run RT6 much longer than 9k mi, you could probably get away with 10k for a nice round OCI number. It "should" have sheared to ~13 cSt, so 14.5 cSt indicates it's actually getting thicker either due to insolubles in suspension, or oxidation or both. Otherwise, great numbers!
+1.

I can't access the uoa from my phone but this definitely sounds like shearing and thickening back up due to oxidation. This is where a BS uoa is limited.

-Dennis
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Old 03-05-2013, 06:31 PM   #5
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Quote:
Originally Posted by atomicfire View Post
T6 is a great oil, but the 5w-30 M1 isn't really well suited for our motors. If you're a brand fan and want to continue using M1, try their 0w-40 oil. It's built up from a completely different base stock and I believe is a G-IV synthetic instead of the "fake" G-III synthetic that the 5w-30 is based on. People have gotten very very good results with the 0w-40 - in fact, it's additive pack is so potent that a lot of people add +1 quart of the 0w-40 to other oils solely for it's additive pack.

If you live near an Autozone, you might want to consider getting Castrol 0w-30. It's a PAO/Ester based G-IV synthetic which you can get 5 quarts + filter for $32 when it's on sale, which is a killer deal. Usually it goes on sale for 3 months, then they rotate some other oil for 3 months, and then the Castrol goes back on sale again.

I have used a lot of oils before, including T5, T6, M1 5w-30, 0w-40, Castrol 0w-30, and a few more I can't remember. The Castrol 0w-30 has by far been the best oil to run in the STi.

I used 5000mi intervals and oil analysis claims the oil should be good for around 8k. My Volvo does 8k intervals with the same oil (4.4L V8) and it runs great - it's oil is also analyzed.
+1 on the M1 0W-40 additive pack info, -1 on the base stock info. XOM created the world's first oil derived from Group III base stocks capable of creating a 0W-x oil. Do a search on Visom.

XOM uses any combination of Group III, IV, and V base stocks. They just don't say which oils contain which base stocks. As the performance of Group III RT6 has shown in uoa's, the end result matters more than which base stocks are used.

/thread hijack.

-Dennis
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Old 03-05-2013, 06:40 PM   #6
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Quote:
Originally Posted by bluesubie View Post

+1.

I can't access the uoa from my phone but this definitely sounds like shearing and thickening back up due to oxidation. This is where a BS uoa is limited.

-Dennis
With regards to the thickness I was a little surprised as it looks to be on the thicker side, and thicker than my previous sample. Overall I was very happy with the results. Input is always appreciated.
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Old 03-05-2013, 08:04 PM   #7
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i usually use 8k miles as the cap for my oci's using t6 gallon with a quart kicker of the 10w40 racing 4t

and i dont worry about it
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Old 03-05-2013, 08:13 PM   #8
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^This is what I do as well... Its a good setup.
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Old 03-06-2013, 07:41 AM   #9
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What are your driving conditions? Any mods?

-Dennis
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Old 03-06-2013, 08:56 AM   #10
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Michigan. Sample was from sep-dec. lots of highway driving below the speed limit. Car always idles for a few minutes before takeoff. No oil added over that whole interval, I check the level periodically while getting gas. Stock 06 wrx with 148k on the engine. Wix oil filter. With a TBN of 2.6, do you think it is possible to go 10k on intervals? What about the thickness? Is it a symptom of bad or spent oil?
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Old 03-06-2013, 09:09 AM   #11
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There's some debate on the exact condemnation limits for different properties. RT6 starts out with a TBN of 10.6 and some UOA labs say 1/3 of the original TBN should be the limit. Blackstone for their part says 1.0 TBN regardless of starting TBN should be OK. The different methods used by different labs account for their varying advice. I'd put some safety margin on Blackstone's recommendation and say 2.0 should be the limit, so you should have at least another 1k miles in it TBN wise.

On oxidation, it's hard to say without an oxidation test. Polaris labs (aka Oil Analyzers Inc.) does oxidation as part of their basic package. You can buy test kits from Amsoil.

Personally, I'd guess you can go 10k without issues, but I'd make sure to run a UOA after the winter fill. TBN drops substantially faster in winter in cold climates like ours.
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Old 03-06-2013, 01:22 PM   #12
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^ What he said, but not sure I would do 10k using Blackstone. Going this far past the factory oci is Dyson territory.
http://dysonanalysis.com/Dyson_Analysis/Welcome.html

Polaris/OAI testing would be just a bit more useful than BS. You're also limited by the oil filter.

-Dennis
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Old 03-06-2013, 09:44 PM   #13
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Quote:
Originally Posted by bluesubie View Post

+1 on the M1 0W-40 additive pack info, -1 on the base stock info. XOM created the world's first oil derived from Group III base stocks capable of creating a 0W-x oil. Do a search on Visom.

XOM uses any combination of Group III, IV, and V base stocks. They just don't say which oils contain which base stocks. As the performance of Group III RT6 has shown in uoa's, the end result matters more than which base stocks are used.

/thread hijack.

-Dennis
This is very true - with today's oil technology, it matters less what base stock the oil is made from,and more how well it actually performs for your application. T6 is a GIII, a "fake" synthetic but it outperforms many other "true" synthetics. Don't let base stock determine what oil to use, base your opinion on how well it performs in your engine.
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Old 03-06-2013, 10:52 PM   #14
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Originally Posted by some dude View Post
Michigan. Sample was from sep-dec. lots of highway driving below the speed limit. Car always idles for a few minutes before takeoff. No oil added over that whole interval, I check the level periodically while getting gas. Stock 06 wrx with 148k on the engine. Wix oil filter. With a TBN of 2.6, do you think it is possible to go 10k on intervals? What about the thickness? Is it a symptom of bad or spent oil?
d0000000000000d....go 8k and forgetaboutit

it aint worth the extra 1k or 2k miles on the oci
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Old 03-06-2013, 10:57 PM   #15
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Originally Posted by atomicfire View Post
This is very true - with today's oil technology, it matters less what base stock the oil is made from,and more how well it actually performs for your application. T6 is a GIII, a "fake" synthetic but it outperforms many other "true" synthetics. Don't let base stock determine what oil to use, base your opinion on how well it performs in your engine.
yeah...shell uses a proprietary process to make their base stock with the t6.....guess it works
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Old 03-07-2013, 12:48 AM   #16
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^ What he said, but not sure I would do 10k using Blackstone. Going this far past the factory oci is Dyson territory.
http://dysonanalysis.com/Dyson_Analysis/Welcome.html

Polaris/OAI testing would be just a bit more useful than BS. You're also limited by the oil filter.

-Dennis
True about the filter. While the Wix is about the only aftermarket filter with a correct BPV pressure, it's also got about the smallest media of any available filter. If the OP wants to do 10k OCIs (which I think are possible), I'd go with filters in the following order:

1 - OEM H6 filter, it's tight, but it should fit, Uncle Scotty uses it on his '06.
2 - The new Purolator Synthetic, probably the 14610 version which is just slightly longer.
3 - Bosch Distance +
4 - Fram Ultra

I'm not sure Terry's advice is needed here, though it's not a bad idea. 7.5k mi is pretty well established as easily feasible on RT6 in a WRX, and extending by 2.5k mi should be pretty easy given lots of highway driving. Maybe it's the diesel owner in me talking, but a little thickening doesn't scare me. My old VW Tdi did 10k on RT6 and the stuff came out like molasses, the car was still going strong at 200k when it left the family. In Michigan though, I might use M1 0w40 instead of RT6.
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Old 03-08-2013, 07:43 PM   #17
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Thanks for the replies. I will update if/when I do additional UOAs.
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