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Old 01-19-2004, 10:42 PM   #1
nickster
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Subaru Stars synthetic oil, what kind?

I have a 03 wrx with 11,000 miles on the clock and I really want to change to synthetic. Any suggestions? Mobil1? Redline? I have heard a lot of good things about Mobil1. Sorry if this is a dumb question.
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Old 01-19-2004, 10:54 PM   #2
Silver04WRX
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use the search button, you'll find TONS of info.

I personally use Mobil 1 - works very well. Car seems to run very smoothly.
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Old 01-19-2004, 11:09 PM   #3
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thanks.
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Old 01-20-2004, 07:19 AM   #4
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I also use Mobil-1 - it's good oil, and it's readily available. Redline should work very well, too, as well as things like Royal Purple or Motul or... it's just that you can't get those pretty much anywhere you buy oil - Mobil 1, on the other hand, can even be found at K-mart!
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Old 01-20-2004, 09:38 AM   #5
Kamen
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I also use Mobil 1 10W30. Since I change it now every ~10K miles it comes out cheaper than petroleum oil. I buy it at Sam's club for under $4 a quart.
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Old 01-20-2004, 09:48 AM   #6
bigpaulo
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Default Mobil 1 is a terrific choice

As is any Group IV/V synthetic based oil (don't get me started... if you don't know what I'm talking about, you may be better off!)

I peruse www.bobistheoilguy.com, and multiple used oil analyses and personal experiences mentioned there suggest that Subaru has engineered their engines to be quite easy on oil, especially the non-turbo Subies.

I personally use Mobil 1 because

1. It's widely available (try finding Redline on a road trip)
2. It's got a good history, and should be around in 10+ years
3. Compared to Redline, Motul, etc. it's priced well
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Old 01-20-2004, 02:50 PM   #7
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i use redline oil
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Old 01-20-2004, 04:08 PM   #8
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I use CanadianTire (synthetic) brand oil, cheapest I can find next to Walmart - but Walmart is far away.

oil questions? bob is the oil guy is the place to be.

Last edited by rilles; 01-22-2004 at 10:46 AM.
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Old 01-20-2004, 09:29 PM   #9
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Haha... i just did the same research for the last week, I've been familiar with different oils on other vehicles, now that i'm in the turbo world, it's a differnt ballgame... rule #1 .. any synthetic will be miles ahead of dino oil... thermal, shear, breakdown, longevity, etc etc... so even your cheapest synthetic is going to be way better than the best petrolium. And if you want to pull your hairs to find the best synthetic, it's not going to happen... one will always have a better pour point than the other, flash point, etc etc... some will say they have tests that outperform the other brand, if you goto the "other" brands website they will have tests to say that they are better, and so on... some poeple laugh but i use syntec. yes some will say it's not a real synthetic but it's good enough.

I've used many oils in many engines ranging from 650hp 468 big blocks to 1.3l rotaries. Redline is good, but not cheap. royal purple i didnt have any problems with but i never used it for a long enough period of time. Royal purple has another additive in it to make it purple so who knows what that will do in the long run, probablly nothing, but who knows. Amsoil, i use in the differential and gearbox. friend had engine problems with amsoil in the past. that and if it's gods gift to oil then why isnt this stuff sold at 7-11? it's also hard to get. I will say I used mobil-1 and had leaks on several vehicles.... they have a new formula now and claim this wont happen... havent tried it yet. valvoline synpower is a good bang for the buck... havent used quaker or penzoil.

There's just something about that old castrol syntec commercial with the engines running on the stands. sure it's advertisement, but there's truth to the matter.
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Old 01-22-2004, 10:51 AM   #10
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Mobile 1 or Amsoil.

K
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Old 01-22-2004, 01:54 PM   #11
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Quote:
Mobile 1
It's Mobil.
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Old 01-22-2004, 05:24 PM   #12
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Mobil 1. It's approved for Porsche which also uses horizontal boxer engines. Plus I can get the exact weight 5W30 recommended in the owner's menu at Costco for cheap. Good enough reasons for me.
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Old 01-26-2004, 10:34 AM   #13
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Castrol (smells Clean open one and smell ) , Mobil1, Amsoil. I go between Mobil and Castrol. With 800miles on the castrol it still smell and looks new. ( i know im strange for the smelln aspect)
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Old 01-26-2004, 04:13 PM   #14
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Quote:
Originally posted by 4npower
Castrol (smells Clean open one and smell ) , Mobil1, Amsoil. I go between Mobil and Castrol. With 800miles on the castrol it still smell and looks new. ( i know im strange for the smelln aspect)
I've never used the smell test for oil before. I can see the ads now for oil that smells nice...


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Old 01-26-2004, 04:16 PM   #15
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I use Royal Purple or Amsoil
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Old 01-26-2004, 04:32 PM   #16
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I've been using Mobil 1 5w-30.
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Old 01-29-2004, 09:20 AM   #17
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Hey is it cool if I run 5w-30mobil 1in my 01 RS?
Someone told me to run that in the winter and then run 10w-30 in the summer. Will this be ok for my 2.5rs engine?
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Old 01-29-2004, 11:53 AM   #18
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I use AMSOil because they are the only ones I've seen who post ASTM test results on their main pages. Tests can be biased, so I trust ASTM test more than the oil manufacturer's homemade tests.
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Old 01-30-2004, 02:25 AM   #19
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Mobil 1 5w-30 in winter
Mobil 1 10w-30 in summer
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Old 01-30-2004, 02:09 PM   #20
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Quote:
Originally posted by Corn-Picker
I use AMSOil because they are the only ones I've seen who post ASTM test results on their main pages. Tests can be biased, so I trust ASTM test more than the oil manufacturer's homemade tests.
If the oil has the API starburst symbol, then you can be assured that it meets standard requirements (as opposed to "the oil manufacturer's homemade tests".) While that may include certain ASTM test methods, there's nothing magical about an ASTM test.
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Old 01-31-2004, 06:18 PM   #21
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Redline is the synth that will protect your hot turbo bearings best. Actually, 5W30 Redline is an ideal oil for the WRX. Protects well in summer and also gives you slightly better oil pressure than the Mobil 1, although I'd definitely use Mobil 1 over any brand of conventional. Make no mistake, dino is the worst thing you can use in a high revving hot running turbo engine! It breaks down faster under high heat and forms harmful deposits far more easily than any synthetic.

With Redline, you need to continue using it so your internal engine parts receive full benefit of the moly protective coating.
Don't just try it once and switch to something else--no point in using it at all if you are going to do that.

American Castrol is not nearly as good as the Castrol imported from Germany. The German Castrol is better because it is designed for high-speed autobahn use but you can only buy it here in the 0W30. Hard to find but excellent stuff if you have some in your area. Pours green in color from the bottle
and will say Made in Germany on the back label.

Last edited by rexaroo; 01-31-2004 at 07:32 PM.
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Old 01-31-2004, 09:22 PM   #22
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I live somewhere in tropical South East Asia and use Castrol RS 10w-50!!! The reason is the ambient temp. here can get as high 36 Degrees on normal days! We never see snow though...

My pal uses 5w-30 and his engine blew up after two years of use. After opening up the engine, we found grooves where the pistons actually rubbed against the walls of the engine. Scary stuff! I know 10w-50 requires more fuel consumption because of its thick viscosity, but I'm not ready for engine failure since my car isn't a year old! Maybe Mobil 1 next time
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Old 02-01-2004, 05:04 PM   #23
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Quote:
Originally posted by SteveS
While that may include certain ASTM test methods, there's nothing magical about an ASTM test.
There is something magical about an ASTM test, they are well documented and have an exact procedure you must follow. Look at some of Redline's tests where they compare their oil to AMSoil. Redline compares the wear rate in a redline oil running engine with 100,000 miles to the wear rate of an AMSoil oil running engine with 1500 miles; there's no consistency. Most of the oil manufacturer's homemade test are poorly (or purposely) designed to favor one outcome over another.

I can go to the library and look up the ASTM test AMSoil used, and I can see the exact procedure they had to follow and decide for myself if that ASTM test is a good indicator of how oil will act in an engine. The homemade tests used by many manufacturers are not well documented, or at least they don't post the exact test procedure for the general public to view, probably because their procedure is weak or not exacting.
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Old 02-02-2004, 09:09 AM   #24
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Corn-Picker - My point is that any reputable oil manufacturer is going to use standard test methods (ASTM, API, MIL), period. Again, any quart of oil with the API starburst symbol is stating that it meets the API requirements for that weight and grade.

Quote:
Redline is the synth that will protect your hot turbo bearings best... With Redline, you need to continue using it so your internal engine parts receive full benefit of the moly protective coating. Don't just try it once and switch to something else--no point in using it at all if you are going to do that.
Is this your opinion, or are you posting an ad?
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Old 02-02-2004, 11:52 AM   #25
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Quote:
Originally posted by SteveS
Corn-Picker - My point is that any reputable oil manufacturer is going to use standard test methods (ASTM, API, MIL), period. Again, any quart of oil with the API starburst symbol is stating that it meets the API requirements for that weight and grade.
I certainly agree that when they have the API starburst symbol they meet standardized tests. My gripe is when oil manufacturers compare their oil to another oil using homemade tests that are poorly designed experiments. Here's an example of what I would call shady experimentation from Redline:

http://kozmik.guelph.on.ca/gtdprojec...soil_S2000.pdf

They don't tell you exactly what they did and the numbers like mileage seem to be randomly chosen.
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