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Old 12-13-2011, 08:31 PM   #1
cosseywrx
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OBP

Default Possible AOS problems

anyone that has a AOS (air oil separator) have a problem with oil disappearing? im pretty sure this started shortly after it was installed a few months back. no leaks on top or bottom of the boxer....oil possibly being hidden somewhere? next step is to check inside the intercooler this weekend.

those that have a AOS can i see a pic of your setup? most positively sure mine is correct, but seeing as my engine was replaced b4 i bought it i have noticed bolts or lines that are out of place or in wrong place....i fear for this engines life....

no engine mods on the car....stock! 05 wrx
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Old 12-13-2011, 09:39 PM   #2
coldfiremx
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Every engine consumes some oil. Do some research you might be surprised at how much oil consumption is acceptable in some cars.
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Old 12-13-2011, 09:53 PM   #3
Alaskan EJ20
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only mod is the AOS. how much oil is vanishing.
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Old 12-13-2011, 10:05 PM   #4
ridestreet84
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i have one, havent noticed anything to major
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Old 12-14-2011, 12:35 AM   #5
Rakaz
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I thought that the AOS was supposed to reduce or eliminate oil consumption
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Old 12-14-2011, 01:11 AM   #6
Wes_FSTGDB
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Quote:
Originally Posted by Rakaz View Post
I thought that the AOS was supposed to reduce or eliminate oil consumption
^This.

It helped reduce my oil consumption quite a bit and kept a ton of the blow by out of my intake. I never noticed oil disappearing or the white frothy stuff that people always mentioned.

Here is a pic of my setup before I sold my car.

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Old 12-14-2011, 01:28 AM   #7
AK_Ford
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Quote:
Originally Posted by Rakaz View Post
I thought that the AOS was supposed to reduce or eliminate oil consumption
They are, but only consumption that is caused by blow-by. If oil is getting past the rings it's a whole new ball game.
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Old 12-14-2011, 03:14 AM   #8
cosseywrx
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my setup is the same as the pic...i opened one of the lines and oil is making its way in them...about 2500 to 3k in since my last oil change an lost lil over 3/4 of a 1quart. my oil is still a gold color so no need to change it yet.
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Old 12-14-2011, 03:36 AM   #9
coldfiremx
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The chemical structure of oil breaks down over time and from conraminatio, ie. crankcase gasses, condensation, fuel. Color is only one factor in checking oil condition. I recommend changing at 3k miles, but that is my own preference from personal and professional experience.
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Old 12-14-2011, 04:26 AM   #10
tribalwrx
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Quote:
Originally Posted by cosseywrx
my setup is the same as the pic...i opened one of the lines and oil is making its way in them...about 2500 to 3k in since my last oil change an lost lil over 3/4 of a 1quart. my oil is still a gold color so no need to change it yet.
3/4 to a quart every 2500-3000 miles isn't as bad as you think, I think Subaru used to say that a quart every 1000 was acceptable any more then that and they'd do a consumption test/tracking

What kind of oil are you using?
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Old 12-14-2011, 10:40 AM   #11
cosseywrx
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Valvoline synthetic
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Old 12-14-2011, 02:04 PM   #12
tribalwrx
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Quote:
Originally Posted by cosseywrx
Valvoline synthetic
5w30 or 5w40?
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Old 12-14-2011, 03:51 PM   #13
Wes_FSTGDB
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Quote:
Originally Posted by cosseywrx View Post
my setup is the same as the pic...i opened one of the lines and oil is making its way in them...about 2500 to 3k in since my last oil change an lost lil over 3/4 of a 1quart. my oil is still a gold color so no need to change it yet.
That's standard in my opinoin. My STi was gobbling up close to a quart every 1500 miles. They eat oil, but of course mine was highly modified. If your car is a 2005 then I would think it's in great shape.

I too agree on the 3,000 mile service. It was rare I ever let my STi reach 5,000 before an oil service. Believe it or not BMW says 15,000 miles before an oil change lol. That'll be the day I let that happen
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Old 12-14-2011, 03:57 PM   #14
coldfiremx
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My mom just traded her 09 Benz in for an 11' they told her it only needs to have the oil changed once a year
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Old 12-14-2011, 07:25 PM   #15
P3Auto
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AOS will only capture oil vapor and oil coming out of the vents on the motor (valve covers, top of crank). If you are actually buring oil due to leaking valve seals, rings, etc then the AOS does nothing for you.

Have someone drive behind you and accelerate hard to redline then just let off the gas and let the motor engine brake the car. If you see a nice puff of white/blue smoke when you lift or during acceleration then you know your burning it. Don't mistake black smoke for oil smoke this would be unburned fuel causing the black smoke.

Do a compression check to see if you have any major issues, then perhaps a leak down test if you have the tool and ability to do so.

As stated here Subaru has stated 1000 miles and 1 quart burned is not out of the range of acceptable.
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Old 12-14-2011, 08:44 PM   #16
cosseywrx
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I use 5w30. I try the oil burn test. How much is a compression test or the tool to do it? gueses
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Old 12-14-2011, 10:23 PM   #17
ridestreet84
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The 5w30 could be a little bit of the problem, try shell rotella T 5w40 and report back
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Old 12-15-2011, 12:01 AM   #18
JordyB
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When I bought the fozzy, dunno what oil it had in it, but it used a quart in 1500 miles, I switched to RotellaT 5w-40, saw a tiny bit of lose as the oil set in, but after 1 oil change, all oil usage as disappeared and has been solid the last couple oil changes as well. I had 70k on the ticker when I bought it. I use it in both Subarus and its been working great! Highly recommend!!!
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Old 12-15-2011, 12:57 AM   #19
cosseywrx
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Wheres ut sold at. Dont remember seeing at oriellys. Bout only place u go.
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Old 12-15-2011, 01:22 AM   #20
Carter
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Walmart should carry it.
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Old 12-15-2011, 02:19 AM   #21
tribalwrx
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Actually you can use either the rotella t6 5w40 which I also recommend or the valvoline synpower 5w40 either one has had very good reviews on nasioc and some of the oil blogs as well. I normally do 5000 mile changes with my car and send out samples for UOA and the rotella has always come back in spec
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Old 12-15-2011, 02:20 AM   #22
tribalwrx
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You can find it at walmart as long as the diesel guys aren't hoarding it up in Fairbanks..lol
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Old 12-15-2011, 05:49 PM   #23
cosseywrx
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Wallmart was 10 bucks cheaper than a auto store. Do yall put a jug in and a lil extra? i dont think one is enough or is it? our cars take like 4 and 1/2.
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Old 12-15-2011, 06:18 PM   #24
ridestreet84
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I will buy a jug and I will also buy a quart of it if they have it if now I just buy two jugs
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Old 12-15-2011, 06:37 PM   #25
cosseywrx
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Thats what i did. They dont sell it in qts anywhere here. Kinda sucka. New question!!

what filters do you guys like to use. Im a fram kinda guy. Just always used them.
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