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Old 04-06-2013, 07:52 PM   #1
wrxposer
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Default Oil Question

I realize this may spark huge debate, but my car is about to turn over 100,000kms and I've been reading a lot about oil recently. I want to know what locals are using.

I've realized the Mobil 1 I've been using is basically crap (HTHS of 3.1 for 5W30) I've read great things about Redline and would love to use it but it seems retarded expensive and hard to find. I also read that a lot of people are running Rotella T6 but because it only comes 5w40 it results in higher than ideal oil pressures.

Is anyone using an economical synthetic oil available locally or at least in US big box stores that has HTHS numbers closer to the 3.8 of Redline in 5W30?
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Old 04-06-2013, 08:43 PM   #2
brett192
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Rotella T6 here with good results always. I haven't heard many bad things, this is the first.
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Old 04-06-2013, 08:47 PM   #3
Drakar
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http://forums.nasioc.com/forums/show...&highlight=oil


a little searching goes a long way.

Lots of good info and locals talking about their oil and experience.
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Old 04-07-2013, 01:48 AM   #4
wrxposer
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Quote:
Originally Posted by Drakar View Post
http://forums.nasioc.com/forums/show...&highlight=oil


a little searching goes a long way.

Lots of good info and locals talking about their oil and experience.
I dunno how I missed this thread while I've been searching and reading but thanks.
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Old 04-06-2013, 09:48 PM   #5
danny_d19
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Always use Rotella T6, I get it at walmart
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Old 04-06-2013, 09:57 PM   #6
DIGGYGV8
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I use ALL motul fluids for my car (engine oil usuall 8100 x-clean/300V only for beating time). It's been in all my cars and I've never once had a huge issue.

The only time I cycle'd in crappy oil was to flush out metal shavings from a previous project.

For any basic car, I REALLY loved quaker bulk, but they don't have that anymore, so regular pennzoil yellow bottle is good for beaters.
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Old 04-06-2013, 10:27 PM   #7
timbits
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I'm past 200k and I just use cheap synthetic. Usually castrol edge from Costco. Ive sent in for oil analysis and have been cleared for 14k+ change intervals.

This makes me think that most users are changing way way way too often. And are unnecessarily concerned with brands/specs... But get an analysis done. You'll be surprised how much longer your oil can last.

Last edited by timbits; 04-08-2013 at 03:10 PM.
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Old 04-07-2013, 12:06 AM   #8
DIGGYGV8
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Quote:
Originally Posted by timbits View Post
I'm past 200k and I just use cheap synthetic. Usually castrol edge from Costco. Ive sent in for oil analysis and have been cleared for 14k+ change intervals.

This makes me thing that most uses are changing way way way too often. And are unnecessarily concerned with brands/specs... But get an analysis done. You'll be surprised how much longer your oil can last.
My only rebuttle to that is that although your oil would come out nicely, it doesn't mean it doesn't sludge up inside, which is where some of the "harm" comes into play.

Kinda like how clean water can flow through pipes, but pipes eventually get clogged or dirty (1st time home owner, and it's annoying me lol)
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Old 04-07-2013, 02:02 AM   #9
wrxposer
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Regarding the Rotella 5W40 ...from this thread http://forums.nasioc.com/forums/show....php?t=2083780

williaty has been around quite awhile and actually done a lot of testing on the N/A 2.5 engine.

Quote:
Originally Posted by williaty View Post
I agree that you shouldn't be running 10w40 for two reasons. First, you want the lowest possible cold viscosity you can get. No matter how warm your climate is, there's no such thing as an oil that's thin enough on startup. You always want to use a 5wXX or 0wXX when it's possible to do so without sacrificing HTHS. Second, 40 weight warm is almost certainly too thick for your engine. Subaru factory engines all seem to come off the line towards the tight end of the tolerance. I've yet to see a modern (GD chassis) NA Subaru without very high oil pressure. You need to build about 10psi per thousand RPM. Most of the ones I've investigated have been making 20-25psi per thousand RPM on 5w30 and even more on 5w40. That's just excessive and undesirably high for a number of reasons.
Quote:
Originally Posted by williaty View Post
The basic 2.5L engine comes with a 7mm pump capped at 72psi. The AVLS engines come with a 9mm pump, also capped at 72psi. The cars will see 100+psi on startup when the oil is cold but that's just to be expected. Once the oil is hot, they're obviously capped to 72psi by the relief valve. However, most of the cars will see that by 2800-2900RPM on 5w30 oil. This means that at highway speeds in the US, the oil pump is constantly in bypass, which is not a good thing. Ideally, if the pump were sized properly to deliver 10psi per 1,000RPM, the pump wouldn't go into bypass until redline, which is a much better situation for the oil.


There's no direct correlation between kinematic viscosity (weight) and HTHS viscosity. However, in general, heavier oils usually have higher HTHS. Kinematic viscosity has nothing to do with engine wear/protection. HTHS has a HUGE amount to do with engine wear/protection. So when people have tried increasing the oil weight and gotten better results, they'd accidentally stumbled onto an oil with higher HTHS. Modern chemistry, however, has given us oils with lower kinematic viscosities and simultaneously higher HTHS viscosities. These are the oils you want to use.
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Old 04-07-2013, 05:19 AM   #10
Kaolinite
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used Rotella T6 and then switched to Castrol Edge Syntec
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Old 04-07-2013, 11:31 AM   #11
ShiftGear
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Using rotella t6
Then motul
Then rotella t6
Now motul
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Old 04-07-2013, 07:07 PM   #12
FunkMasta
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eneos 0-20
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Old 04-07-2013, 08:47 PM   #13
Zefy
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you have a 2.5i. It really isn't going to matter all that much. Just stick with an OEM weight oil and pick one. Everyone here hates mobile 1 so don't get that just so you conform to your peers.

I use castrol synthetic 10w30. Prior to that, pennzoil synthetic and dyno. Doesn't make a difference. And for someone to use something like 40 weight oil is silly. I installed an oil pressure gauge and I was a little surprised at how much pressure these motors have. Full warm, anything above idle I see at least 80psi. And obviously cold it's well over 100psi (don't actually know because the gauge stops at 100psi). I will be switching to 5w-30 next change.
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Old 04-07-2013, 09:57 PM   #14
mattolla
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Amsoil 5-30
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Old 04-07-2013, 10:33 PM   #15
Drakar
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Grape seed for daily and lard for track days
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Old 04-07-2013, 11:55 PM   #16
newtothescene
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Redline 5W30. You can get it at Drivers Edge in BBY: http://www.driversedgeautosport.com/

Your NA motor does not need a high HTHS oil.
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Old 04-09-2013, 11:21 AM   #17
jaydow11
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Quote:
Originally Posted by wrxposer View Post
I realize this may spark huge debate, but my car is about to turn over 100,000kms and I've been reading a lot about oil recently. I want to know what locals are using.

I've realized the Mobil 1 I've been using is basically crap (HTHS of 3.1 for 5W30) I've read great things about Redline and would love to use it but it seems retarded expensive and hard to find. I also read that a lot of people are running Rotella T6 but because it only comes 5w40 it results in higher than ideal oil pressures.

Is anyone using an economical synthetic oil available locally or at least in US big box stores that has HTHS numbers closer to the 3.8 of Redline in 5W30?
Just go to Costco and pick up a cheap case of Castrol Edge and stop worring! You're putting WAY TO MUCH thought into this!

Now if you owned a highly moded turbo Subaru or even a Porsche/Ferrari/Lambo, then your question about proper oil would be more valid/important.

For what it's worth, I change my oil twice a year (6 months). Once in the fall and once in the spring on my 2011 STi.

Spring = Rotella T6
Fall = German Castrol 0w30
Both I get at Walmart.

Cheers,

Jay
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Old 04-10-2013, 12:14 AM   #18
timbits
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Quote:
Originally Posted by jaydow11 View Post
Just go to Costco and pick up a cheap case of Castrol Edge and stop worring! You're putting WAY TO MUCH thought into this!

Exactly!

Cheap synthetic, cheap oil filters, oil analysis every other year or so.
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Old 04-09-2013, 03:32 PM   #19
hi-revs
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Total Quartz 5w50
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