Intake query

[SpeedySub]

Hi All

New to the site and to Subarus in general. This is my first Subaru, a 1998 250T. The question I have is I was having a little look around the engine bay and removed the airbox/Manifold? at the TB and there was quite a bit of oil in it (sorry didn't think to take pics). I know that the breather pipes connect to the airbox/manifold but I am a bit concerned that there was a reasonable amount (at least to me). It appeared to be a few mils in there. Is this common?

Also I have read that this airbox/manifold is there for low rpm torque, so I am assuming that if I remove this and put a pipe connection directly to this it will change the torque characteristics. I would rather have more torque than more horsepower at the moment, so it would be best to leave on?

And yes sorry for the long post - I have been told that I ramble on sometimes!

Edited August 26, 2014 by SpeedySub

[Rosssub]

Very common, especially with a higher km engine. It's just oil residue build up from engine blowby. Pull the pipes off and clean them out with carby cleaner/petrol. A can of Subaru upper cylinder cleaner with every oil change will help too.

[SpeedySub]

 Rosssub said:

Very common, especially with a higher km engine. It's just oil residue build up from engine blowby. Pull the pipes off and clean them out with carby cleaner/petrol. A can of Subaru upper cylinder cleaner with every oil change will help too.

Thanks, thats set my mind at ease a little. My car has done about 168,000k's so not sure if that is high milage for a Sub? I ended up giving it a clean out anyway just in case. I have read a few threads of people adding a catch can, so maybe might do that at some stage money permitting. I'm not so keen on having extra oil in the intake.

[Rosssub]

168 is pretty low considering it's age, my 2000 is about to tick over 220km. I wouldn't be too worried about a catch can, it might take another 50,000km for it to get that bad again.

The Subaru Upper Cylinder Cleaner is great stuff, it will clean all the residue/carbon build up from inside the intake manifold/cylinders etc and help it run a bit cleaner/smoother.

[SpeedySub]

 Rosssub said:

168 is pretty low considering it's age, my 2000 is about to tick over 220km. I wouldn't be too worried about a catch can, it might take another 50,000km for it to get that bad again.

The Subaru Upper Cylinder Cleaner is great stuff, it will clean all the residue/carbon build up from inside the intake manifold/cylinders etc and help it run a bit cleaner/smoother.

I did buy some Threebond cleaner over the weekend. Thats why I noticed the oil. Smoothed out the idling on the car and does seem to run a bit smoother.