A synthetic 5W-30 should flow adequately. Find one that meets the specifications in the manual with a decent price and readily available locally.

 

Avoid Mobil1, I read a lot about how it "shears". Some reports are that it turns watery in short time, comes out like coffee after only 1 or 2 k miles. Have not personally tried it, even though I've used it in my other cars and bikes quite a lot. Currently I'm running (don't laugh!) O'Reily's synth. . .

 

after reading many arguments i finally switched to rotella t6 5w-40 in my 2011 wrx. Seems to warm up a lot faster and its a heavier oil so it wont break down as quick as 5w-30.

 

you'll never get a straight answer asking this, this is like going on yahoo and posting a question that says "should i get a ford or a chevy, an evo or an sti". best bet is to go with what you usually ran before just make sure its synth, you'll get different answers for every response and 100 different reasons why 1 is better

 

If you are really concerned, pick a good oil that meets the specs per Subaru, and then run it for a while and get a used oil analysis. Questions like this won't yield too much decent information in my opinion.

I run rotella T6 5w-40 because it is cheap, and readily available in my area at multiple locations. However, it doesn't technically meet recommended Subaru guidelines IIRC, but my car doesn't drink it like it did with the Subaru brand of oil, so I've been sticking with it.

 

Rotella T6 or German Castrol have consistently posted the most promising UOAs.

 

^ are these synth?

 

In the end, would it matter? A UOA is a UOA.

If a dino oil could provide better sheer resistance and breakdown resistance compared to a synthetic oil operating in the same conditions, I would gladly choose the dino oil.

 

Rotella? Yeah full syn.

 

Rotella T6

 

Just did an oil change with t-6

 

Rotella T6

 

What about Royal Purple? Ive heard good things about it from some tuners around here.

 

Which tuners?

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Most people can not tell you what makes one oil better than the other. Go to Bob is the oil guy. They have technical reviews that tell you why certain oils are better

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The standard Royal Purple is one of the worst performing synthetics on the market.. arguably worse than Mobil 1 5w-30.

 

I am a die hard Amsoil fan, I used it in my 2015 GSXR600, 2009 Honda Civic Si, and now my 2012 WRX. Love it

 

Not the most cost effective oil, and hard to come by in the stores (depending on location) But yes^^ I have had some damn good UOA's on Amsoil.

 

I use whatever synthetic oil the dealership has. I have been too lazy to do it myself lol. I think they Valvoline. I will say that the most consistent oil I see recommended for our cars is the rotella T6 5w-40. I have recently began noticing that my car is burning a little bit of oil. Not a lot, but a little. Been thinking about switching to rotella.

The only oil IMO that is better is Motul. Back in the day when I used to go to Agile Automotive, that is all they used. It is expensive, but my 06 wrx ran great on it.

 

MOTUL 8100 hand's down!

 

I'm a big fan of Pennzoil Ultra Platinum 5w-30. A bit on the pricey side but could be found at Walmart at times on sale for a good price.

 

Oh yippee! Let's revive a thread that is nothing but biased opinions and infinitely argumentative! Woohoo!

 

I joined the Rotella T6 crowd and so far even in subzero wisconsin winter its great. When i drained the Mobil one i had in there even with only 500 miles on it, it was just black and crappy. Rotella is holding up way better.

 

I have been using Amsoil synthetic oil in all my vehicle and 2 stroke off-roaders since 1983 and have never had a engine issue. Once you find the ONE stay with it.

 

If your oil isn't getting dark it's not collecting deposits correctly. That's not a proper way to determine if your oil is working.

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