Hey guys... I'm no stranger to Subarus and bad PCV valves, but this one really takes the cake. I replaced my PCV valve with an OEM one a few months ago. Today I had the intake hose off and the inside of it is COATED with fresh oil; the bottom of the hose is covered in oily sludge. The bottom of the airbox has a puddle of oil in it. I had thought I was burning oil from an internal engine problem, now it definitely seems otherwise.

 

What else do I need to replace to keep the oil out of the intake system? This obviously isn't leftovers from before I did my PCV; it's fresh. Also, this car has the modified Loyale PCV system that doesn't allow the familiar clouds of smoke on hard turns. Any ideas?

how many miles are on the subaru it sounds like blow by

150k. I thought if you had blowby exhaust would get out through the oil cap? Haven't had any of that happen, also haven't had any noticeable power loss or rough running. Just have had friends driving behind me tell me they see a puff of blue when I take off and shift gears.

Somehow a large quantity of blow-by gas is escaping past your rings. I would do a compression check to find out the condition of the rings. Then, if they are a little low, sealing the rings with a little oil and seeing if the pressure comes up. If that happens, I would suspect leaky rings allowing lots of blow-by, which contains lots of oil, and will trapped in the air filter, or airbox.

 

Or more simply, perhaps your PCV inlet hose (the one that connects to the PCV valve itself) is clogged or otherwise restricted? This would cause gases and pressure to build and back up the system, eventually causing oil to come out the entrance to the system - the airbox.

i would check under your oil cap if you have blow by there will be white foam looking stuff this happen to me before and it was blow by and my rings was shot good luck;)

What does the oil on the dipstick look like?

White frothy looking?

A buddy of mine had freeze plug start to leak on the head,

and let water into the oil.

try checking the hoses themselves

 

the sedan would ingest oil, and it was due to the hoses being clogged up like a bad coronary artery.

we replaced them with standard 5/8" hose, and all was good

my dad had this problem on a 90 loyal, it keept getting worse till it got to the point that it was using 2 quarts in 50 miles and leaving a huge smoke screen, it would clear up some time but then come back. anyway it turned out to be a broken ring.

 

good luck.

Doesn't surprise me if this indicates bad rings. I've known I was burning oil for a few months now and have been preparing to swap the engine. I guess this is just more evidence towards the fact that this engine is on it's decline. Thanks guys.