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Old 01-10-2011, 02:20 PM   #1
MSMStannyl
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Default Air/Oil Seperator

So I'll admit, I'm brand new to the Subaru cars. Just bought my first one, a 2011 WRX. I've heard/read about this issue previously but, for some reason, was under the impression that this wasn't really a problem with the newer vehicles and am hoping someone can explain this a little better.

What I'm wondering about is whether an Air/Oil seperator is required on a what is a stock WRX at the moment. I will, however, have a Cobb AP running by the end of the week (not sure if this changes anything but figured I would point it out). Also, in the next few months, I may have an AEM Intake installed but am not positive yet. In any case, I'm wondering at what point, if any, do I need to start worrying about oil getting into the intake as explained in the article (link below). Yes, the article is based on a 2011 STI but I would imagine similar issues would come to a WRX as well, right?

http://www.importtuner.com/powerpage...sti/index.html

Anyway, why does this happen? Is it bad for the car? Is it a known issue with Subaru's and if so, why don't they do something about it? Lastly, does this only become an issue when you upgrade something specific?

Thanks for help and sorry for being a newbie!
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Old 01-10-2011, 03:38 PM   #2
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Quote:
Originally Posted by MSMStannyl View Post
So I'll admit, I'm brand new to the Subaru cars. Just bought my first one, a 2011 WRX. I've heard/read about this issue previously but, for some reason, was under the impression that this wasn't really a problem with the newer vehicles and am hoping someone can explain this a little better.

What I'm wondering about is whether an Air/Oil seperator is required on a what is a stock WRX at the moment. I will, however, have a Cobb AP running by the end of the week (not sure if this changes anything but figured I would point it out). Also, in the next few months, I may have an AEM Intake installed but am not positive yet. In any case, I'm wondering at what point, if any, do I need to start worrying about oil getting into the intake as explained in the article (link below). Yes, the article is based on a 2011 STI but I would imagine similar issues would come to a WRX as well, right?

http://www.importtuner.com/powerpage...sti/index.html

Anyway, why does this happen? Is it bad for the car? Is it a known issue with Subaru's and if so, why don't they do something about it? Lastly, does this only become an issue when you upgrade something specific?

Thanks for help and sorry for being a newbie!
Do not worry. No AOS is necessary until waaay down the mod road, and by then you will be posting answers instead of questions.
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Old 01-10-2011, 03:54 PM   #3
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Originally Posted by SeeeeeYa View Post
Do not worry. No AOS is necessary until waaay down the mod road, and by then you will be posting answers instead of questions.
Hahaha, well said. That's the answer I was hoping for!

Thanks!
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Old 01-10-2011, 04:12 PM   #4
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to answer your question....

Is the Air/Oil Separator suitable for a stock/daily driver?-

Yes... You can pull the intercooler off your new car with only 500 miles on it and find oil inside of it. The purpose of the AOS is to remove this oil from the intake system to lessen the possibility of detonation which is the main cause of broken ring lands on the stock pistons. As you increase your HP, the amount of blow by passing through your breather system increases as well. This scenario also increases the need for our AOS.

^this is from Crawford performance.
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Old 01-10-2011, 04:36 PM   #5
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well im in the same boat im waiting for my 11 wrx to arrive, wouldnt the perrin catch can do the same thing but instead of putting it back into the motor just to fill up the can? plus cheaper
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Old 01-10-2011, 04:41 PM   #6
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Originally Posted by Jarzar06 View Post
well im in the same boat im waiting for my 11 wrx to arrive, wouldnt the perrin catch can do the same thing but instead of putting it back into the motor just to fill up the can? plus cheaper
Yes, but then you have to maintain it and always empty it. The cool part of an AOS is that the oil stays in your system and you dont have to worry about any low oil issues.
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Old 01-10-2011, 04:50 PM   #7
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Yes, but then you have to maintain it and always empty it. The cool part of an AOS is that the oil stays in your system and you dont have to worry about any low oil issues.
alright ill prob. just go with the crawford AOS and be done with it thanks

jw whats the thought on the grimmspeed ones?
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Old 01-10-2011, 05:29 PM   #8
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just installed a grimmspeed in mine works great so far easy to install
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Old 01-10-2011, 10:33 PM   #9
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I just bought a 2010 Impreza Outback Sport Saturday. Air/Oil Separator is the first thing on my list to do to the car. It only has 7900 Miles on it, but my 02 WRX has 92,000 with a LOT of oil in the intake system. I have had a Cusco oil catch can on the WRX since around 50,000, but it has never really caught anything. My friend with another WRX with the Perrin catch can hasn't caught anything either. I like products from both of these brands, but the catch cans don't work unless you are at WOT (Wide Open Throttle).
I plan to get the Grimmspeed and use clear hoses to see if it is actually working. On my WRX the hoses coming in and out are clear, and both are coated in burnt oil. Cusco says that their race car's can has to be emptied all of the time, but daily driving I'm getting nothing. And I DO run the car hard fairly often.
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Old 01-11-2011, 10:32 AM   #10
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Does anyone have any opinoin on which AOS is better the crawford or the Grimmspeed. It seems like the Grimmspeed has a much easier install and uses differnt hoses to tie into. Are they any benifits to either, besids the price.
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Old 01-11-2011, 10:33 AM   #11
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these are the videos i used to install referance

Crawford AOS Install
http://www.vipstand.net/en/online-vi...-Subie-TV.html

Grimmspeed AOS install
http://www.grimmspeed.com/catalog/pr...roducts_id=191
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Old 01-11-2011, 10:56 AM   #12
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while grimmspeed and crawford are reputable companies, there are other aos systems that works the same and less expensive. Check out sg motorsports over at import image racing. This is what I have. I removed my intercooler yesterday and their was not one drop off oil where as before it had alot. And before the aos my car was not even modified.
And when I remove the oil cap you will see all the condensation left in the filler neck. My aos works great and in the gb I got it for half the cost off GS or Crawford. You cant go wrong with any of those brand, but shop smart do yor research.
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Old 01-11-2011, 03:46 PM   #13
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After doing some searches it seems that the crawford AOS uses coolant to heat it the oil and reduce any water build up. That is not an option for the Grimmspeed so will they have the same issue that crawford has with there V1 AOS
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Old 01-11-2011, 08:03 PM   #14
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Quote:
Originally Posted by Dave_zok View Post
After doing some searches it seems that the crawford AOS uses coolant to heat it the oil and reduce any water build up. That is not an option for the Grimmspeed so will they have the same issue that crawford has with there V1 AOS

That is an after thought or actually a response to a problem all Crawford AOS had where the oil would coagulate and clog the lines rendering itself useless.

They now use coolant to heat the canister to keep the oils from coagulating and supposedly they actually work now.

The SG motorsports unit is a very nicely made piece and I also got in on the group buy.

Another very good option that works really very good is the Ixiz Concepts AOS.

I also have an Ixiz on my STi and it is flawless.
The Ixiz are not as nice looking, but they certainly work well (speaking from 400+ HP meth/pump experience).

I have yet to install the SGM unit on my Forester, but will before the week is out.

I would be cautious about paying $375.00 for a Crawford AOS. WAYYYYYYYYY too expensive for what you get in my "opinion".

Last edited by Team Scream; 01-11-2011 at 08:21 PM.
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Old 01-11-2011, 09:18 PM   #15
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I have an ixiz unit and the other day I cut one of the lines because it was in my way, and quite a bit of water poured out of the line. Should I be concerned? I've been meaning to call ixiz about it.
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Old 01-11-2011, 09:34 PM   #16
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Interestingly, I've NEVER had any of these problems.

But then, I've never had an AOS either. In fact, regardless of use and level of mod, in two turboed Subarus over the last six years, I've never had a problem related even remotely to the stock PCV system.

I may not get one for the new WRX... but I'll think about it. I still have a little box of parts I've gathered. I just haven't thought I needed one yet.

Seems like a nasty thing to deal with to me. Nothing to deal with with the stock stuff. Probably why I'm still thinking about it.
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Old 01-12-2011, 02:07 PM   #17
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Wow, I'm surprised. I really thought this wouldn't of been an issue until way down the mod road. I'm surprised Subaru puts out stock engines that have these kinds of issues. Other than low oil levels due to oil all over the intercooler,intake, etc., could there be any other problems? I mean in terms of where this oil is going?

So if I understand these posts correctly, most of you are recommending getting an AOS even on a brand new 2011 stock WRX? I wonder if this would have any warranty impacts with the dealership even tho you're technically fixing a problem for them.

Lastly, is there any quick an easy way to check to see if I'm getting oil outside of where it needs to be? I read, above, about the intercooler but is that something more involved (I have no idea since this is my first Subie)? Is there an easy and quick "at a glance" kinda thing I can do to see if this is happening?
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Old 01-12-2011, 02:21 PM   #18
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I have a Subaru with 140,000 miles on the ticker. I have never used any form of catch can or AOS. I don't look into my intercooler or intake plumbing for oil or mice as there's no need. I start my car and whip the crap out of it whilst performing maintenance IAW the maintenance schedules. I only have 140,000 miles on my car and burn zero oil and use whatever oil is on sale or is closest to my hand at whatever store I am in at the time. Can you guess what my opinion is of these products that I don't use and am standing at 140,000 miles?
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Old 01-12-2011, 05:12 PM   #19
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Originally Posted by Unabomber View Post
I have a Subaru with 140,000 miles on the ticker. I have never used any form of catch can or AOS. I don't look into my intercooler or intake plumbing for oil or mice as there's no need. I start my car and whip the crap out of it whilst performing maintenance IAW the maintenance schedules. I only have 140,000 miles on my car and burn zero oil and use whatever oil is on sale or is closest to my hand at whatever store I am in at the time. Can you guess what my opinion is of these products that I don't use and am standing at 140,000 miles?
So if I understand what you're trying to say, you're saying that getting an AOS is an absolute MUST and that you wouldn't drive a single mile without one, right?

Haha. Just kidding. Yes, I got what you're saying. That's pretty much in line with what I was assuming, I just don't have the experience with Subaru that others do.

That's good to know tho, thanks!
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Old 01-12-2011, 10:55 PM   #20
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Look, I don't know about anyone else's car except mine. All i know is with stock and then stage 2 I always had oil in the hose and intercooler after the turbo. When I replaced the turbo inlet their was oil sludge in the old one. Now I have full mods, atp3071 and everything to go with it, and when I took my intercooler off to do some maintenece, what do you know no oil anywhere. I don't know how it affects the performance but all I know is their is no oil in my intercooler anymore. So does my AOS works, hell yeah. Do you need one? Thats up to you.
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Old 01-13-2011, 02:03 AM   #21
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Quote:
Originally Posted by Unabomber View Post
I have a Subaru with 140,000 miles on the ticker. I have never used any form of catch can or AOS. I don't look into my intercooler or intake plumbing for oil or mice as there's no need. I start my car and whip the crap out of it whilst performing maintenance IAW the maintenance schedules. I only have 140,000 miles on my car and burn zero oil and use whatever oil is on sale or is closest to my hand at whatever store I am in at the time. Can you guess what my opinion is of these products that I don't use and am standing at 140,000 miles?
How much power does that motor make? (on the dyno of your choice)
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Old 01-13-2011, 07:54 AM   #22
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Has anyone had warranty issues with a dealership after installing an AOS? I know that technically you're fixing a legitimate issue that Subaru seems to not have addressed but you know how some dealerships can be...

By the way, is there any reason to think the oil in the piping issue may have been fixed by Subaru in the later years (like 2011)? Why is there no recall? I would imagine this could hurt the lifespan of the engine as well as cause other parts to fail if enough sludge gets in...
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Old 01-13-2011, 11:34 AM   #23
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Last dyno run for me was 292WHP....stock was 165WHP, been going up and up slowly over 7-8 years.

This is and never will be a recall. Read my post above. Having oil in the piping is an aesthetics issue. If you believe otherwise, my engine longevity would like to have a talk with you.
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Old 01-13-2011, 02:31 PM   #24
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Quote:
Last dyno run for me was 292WHP....stock was 165WHP, been going up and up slowly over 7-8 years.
What about the ppl with 400whp?

FYI, had a lot of oil blow by and after installing the crawford A/O there was non after.
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Old 01-13-2011, 03:33 PM   #25
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Don't think it's an issue even at 1000HP. While they are popular and inexpensive and I have no hate for the various solutions per se, it's just not warranted. I have seen zero posts here that said, "My engine assploded and I am to blame because I don't have a catch can or other oil reclaimation device." I think it's mucho ado about nothing, but that's my crappy opinion and ya'll are free to do as you like.
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