Assuming that your turbo is in good shape and your oil feed line is sufficient I would check to make sure the inside of your drain line is not partially blocked where the fitting fits into the line. The 90 degree bend should not be a problem. Sometimes when assembling these lines the end of the fitting folds over the line and causes a blockage.

Couple questions,

You said your PCV valve seems good, and you re plumbed the catch can?

Why do you have a PCV valve if you're running a catch can?

What size AN is your oil drain line?

Photos of the catch can. I've already seen someone install a catch can like this and think they're doing themselves a favor. Notice the lack of a vent, meaning the engine is breathing through the turbo:

Exactally why I'll have two LARGE breather filters for my huge holes i put in my catch can, and -10 to Vc

Well it's in the works. Until then dumped into a gatorade bottle

JusMX141 said:

Photos of the catch can. I've already seen someone install a catch can like this and think they're doing themselves a favor. Notice the lack of a vent, meaning the engine is breathing through the turbo:

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I notice all that rust on the strut tower.

If you're going to do something do it right. There is no point in using a PCV valve if you're running a catch can.

You can quote and tell me how someone on some website, or forum did his and said it works but look at all the guys going fast and making big power. If it works for their car it will work fine on your 300-500hp build.

Well I can remove the pcv fitting and just run the catch can I will post a pic of my set up when I get it all back together later tonight. I have a -10 an fitting for the drain and when I took it off a couple days ago I could not see any blockage but I will check for sure again.

JusMX141 said:

Photos of the catch can. I've already seen someone install a catch can like this and think they're doing themselves a favor. Notice the lack of a vent, meaning the engine is breathing through the turbo:

You must be logged in to view this image or video.

Click to expand...

In this pic is there a drain at the bottom of this catch can? Just curious

I found this on DSMTUNERS. I hope it explains the correct PCV system.
http://www.dsmtuners.com/forums/articles-engine-fuel/366890-4g63t-pcv-system.html

MQTalon92 said:

I found this on DSMTUNERS. I hope it explains the correct PCV system.
http://www.dsmtuners.com/forums/articles-engine-fuel/366890-4g63t-pcv-system.html

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I have read this post b4 and I was going to set up "setup #1 - the improved factory setup" without the check valve. I just cant see that this is causing the turbo to burp up so much oil. As a control I did disconnect both the VC lines to vent 100% to the atmosphere and it still was burping up oil.... so in my head that should eliminate pcv as causing too much pressure? I could be wrong I am in no way an expert on the matter and to be honest with the dozens of posts I have read on the matter I am confused as all hell!!! But we must keep truckin! I need this thing to prove everyone wrong! ( everyone is always dissin the DSM, They are skerd)

The PVC system is there to pull vacuum on your crankcase. The checkvalve keeps boost pressure from entering your crankcase from the intake. At idle the intake manifold pulls vacuum and under boost or full throttle the vacuum comes from the pipe between the MAF and the turbo. You need vacuum to keep crankcase pressure from pushing oil past your turbo seals. That picture you posted with both lines going to catch can from valve cover would cause excessive pressure in the crankcase. Remember that when the pistons are going up and down along with whatever pushes past the pistons causes pressure that has to go somewhere. That somewere is the turbo seal.

Thank you for your help, Just to clarify the picture Jus posted is not my set up. As of right now my setup has nothing connected just open pcv valve and open VC vent and I will be setting my catch can(s) back up tonight.

Post some pics of your set up so we can see how you have it.

delearious02 said:

As of right now my setup has nothing connected just open pcv valve and open VC vent

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Without vacuum to draw it open, the PCV valve is staying shut 100% of the time that the engine is idling and only blows open under boost when crankcase pressure is great enough to do so.

Either remove the PCV valve altogether and thread a nipple in it's place and run hose to the ground, or hook it back up to the manifold as it's intended from the factory.

Make sure you have the correct PCV valve for a turbo engine to hold back the boosted presure

Here is my take on this,

Okay if your turbo is leaking oil into your IC piping then you have a bad seal on your compressor housing or something isn't sealed correctly. This could have been cause by too much boost (pressure) on the motor and not enough vent. In my opinion running a stock turbo or any larger turbo with more than factory boost pressure will cause issues with this, like blowing out the dip stick.

Have you taken the compressor housing off your turbo? How old is it, did you buy it new or used? How much boost are you running?

You need a vented catch can setup and you don't need to run a PCV valve with a catch can.


Its going to be either the seals on your turbo are bad, or there is more pressure in the system than can be vented and its escaping from the weakest point to allow relief.

Ok so here is what i am doing tonight after work. I am going to hook up a catch can going from the pcv and back to the intake manifold ( adding a check valve when i get it in the mail ) then running the other vc vent into the intake ( how ? Im not sure because i dont want to drill a hole into my fp intake )

I feel like you guys are incredibly HELPFUL!!! cant believe the amount of replies this post is getting... I'm glad I gave dsms another chance ....


BTW the turbo is a year old but has never seen boost other than 6-8 psi has been sitting for a while now. I also wanted to say since this thread was started I have NOT been able to mess with the car so as soon as I can I will put everyones suggestions to the test and hopefully fix the issue, if it does not Justin will have a package at the door next week .

MQTalon92 said:

Make sure you have the correct PCV valve for a turbo engine to hold back the boosted presure

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They're the same part number, turbo or non (MD024719).

J_HEATH said:

You need a vented catch can setup and you don't need to run a PCV valve with a catch can.

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Ideally you should still run a PCV valve and/or check valve, even with a catch can, so the vapors can be evacuated. As stated in this link from above:

Important point #5: Catch cans should always be connected to a vacuum source to help pull air through them, rather than vented to atmospheric pressure..

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J_HEATH said:

Its going to be either the seals on your turbo are bad, or there is more pressure in the system than can be vented and its escaping from the weakest point to allow relief.

Click to expand...

Turbo sealing rings don't just "go bad" without an underlying cause like excessive shaft play or extreme age.

After so many heat cycles the spring steel can lose it's ability to do it's job...but if you have oil running out of both sides of a newer turbo that has no shaft play at all, you most-certainly have an issue with either too much pressure entering the turbo or an inability to drain.

So just an update I have plumbed up the catch can and the pcv system and I believe I have fixed the problem. I started the car and ran the car with no oil seeping past the seals. I have not had much time at all so after further testing I will let you guys know. thanks for all the help

btw just an update ... no more oil! thanks for everyones help. It was a combo of bad pcv routing and vacuum line. after all the reading and research I just did not get it! but after going over it again I could have had this fixed a while back. It was just SOOOO much oil it made me think it had to be alot more than just lack of vacuum.