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Old 03-31-2012, 02:14 PM   #1
ManualOverAuto
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Changed the air filter today (stock intake with black box, rectangular filter, ect). It was really dirty (should have changed it a while ago) and I noticed 2 or 3 oil burn spots on the filter. About the size of a bottle cap. Again I was told I needed a new one about 9,000 miles ago.

[b]Do you think those oil spots could have been caused by my recent valve cover gasket/tube seal leak and misfire?[b]
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Last edited by ManualOverAuto; 03-31-2012 at 09:45 PM.
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Old 03-31-2012, 07:31 PM   #2
ManualOverAuto
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Also, I don't have the filter anymore and forgot to take a picture of it.
I tried to get a picture off google to show what it looked like but there's nothing.

So just imagine a dirty filter with some "bottle cap" sized oil spots.

Last edited by ManualOverAuto; 03-31-2012 at 09:23 PM.
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Old 03-31-2012, 11:12 PM   #3
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Sometimes oil gets spat out from valve cover vent
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Old 03-31-2012, 11:17 PM   #4
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Quote:
Originally Posted by lolol
Sometimes oil gets spat out from valve cover vent
So it could be regular venting over time or from the recent valve cover gasket failure. That's good to know because I really don't want a hg problem. Not ruling a bad hg out though, I know subi's are notorious for them -_-
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Old 03-31-2012, 11:37 PM   #5
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Quote:
Originally Posted by ManualOverAuto View Post
So it could be regular venting over time or from the recent valve cover gasket failure. That's good to know because I really don't want a hg problem. Not ruling a bad hg out though, I know subi's are notorious for them -_-
Cover gasket leaking won't spit oil into the intake.
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Old 04-01-2012, 12:25 AM   #6
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Quote:
Originally Posted by lolol
Cover gasket leaking won't spit oil into the intake.
So spark plug tube seals won't either?

Damn, you got my hopes up for nothing. So hopefully it is just from the filter being super old, and not a hg problem. I should know about a hg issue when I send out my oil to Blackstone here shortly.
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Old 04-01-2012, 05:46 PM   #7
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Quote:
Originally Posted by ManualOverAuto View Post
So spark plug tube seals won't either?
No, they won't.
Search the web for "oil in intake manifold"

Oil comes form crank case or valve cover and these connections are for emission control. Overfilled oil, normal oil splashing up the lines cause oil getting spit into intake.

Check to see that oil isn't overfilled. I read here that oil level is hard to read on some Subarus due to difficulty getting a stable reading on the dipstick.

Check that PCV hose and valve are in good order. Replace air filter and observe.
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Old 04-01-2012, 07:30 PM   #8
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Quote:
Originally Posted by lolol
No, they won't.
Search the web for "oil in intake manifold"

Oil comes form crank case or valve cover and these connections are for emission control. Overfilled oil, normal oil splashing up the lines cause oil getting spit into intake.

Check to see that oil isn't overfilled. I read here that oil level is hard to read on some Subarus due to difficulty getting a stable reading on the dipstick.

Check that PCV hose and valve are in good order. Replace air filter and observe.
That's where you confuse me lol. You said that oil can come from the crankcase or valve cover. If I had a valve cover gasket leak why wouldn't that explain the oil spots?

Anyway it's not from an overfill. When the old air filter was in, the oil level was fine.

Checking the pcv valve in the next few days. Whenever I get the chance really, cause it seems pretty easy from what I've seen/read.

Last edited by ManualOverAuto; 04-02-2012 at 12:30 AM.
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Old 04-02-2012, 05:15 PM   #9
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Replaced the pcv valve today. Super easy, and $7. The old one was pretty gunked up, although it still rattled just a little. Put in a fresh one anyway, so during the next oil change I'll check the air filter and see how it looks.

While trying to screw it in I did drop it down into the engine, ha. That was the hardest part of the whole thing, trying to squeeze my hand down there to retrieve it.

So thanks for the tip.

Last edited by ManualOverAuto; 04-02-2012 at 10:58 PM.
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Old 04-02-2012, 09:39 PM   #10
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Quote:
Originally Posted by ManualOverAuto View Post
. If I had a valve cover gasket leak why wouldn't that explain the oil spots?
Valve cover vent connects the space under the cover into intake. Cover gasket seals between the cover and the cylinder head. If the gasket leaks, oil would leak along the side of the engine and drip on the ground, not into the intake.

As camshaft and valves dance around, oil splashes around inside the case. Some mist gets carried into the vent hose connected to intake.

Make sense?
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Old 04-02-2012, 10:57 PM   #11
ManualOverAuto
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Quote:
Originally Posted by lolol

Valve cover vent connects the space under the cover into intake. Cover gasket seals between the cover and the cylinder head. If the gasket leaks, oil would leak along the side of the engine and drip on the ground, not into the intake.

As camshaft and valves dance around, oil splashes around inside the case. Some mist gets carried into the vent hose connected to intake.

Make sense?
Yea I see what you mean now.

So when the pcv valve gets sticky or clogged that mist is forced somewhere else causing potential problems?

Also, my valve cover gasket didn't leak to the outside. It was all inside, but there was also leaky plug seals.

Last edited by ManualOverAuto; 04-02-2012 at 11:21 PM.
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