Could be burning off gasket goo.

Replace both, the other one will go as soon as you don't.
https://www.chevyhhr.net/forums/how-...13-14-a-28779/

 

Just thought of the old engine block porosity issue , the 08’s had an issue.

 

Yep, engine oil and coolant both. Sounds like oil. Could be a few things, bad turbo, bad rings, bad valve guides, clogged PCV valve, bad check valve.

The easiest check is for the check valve. Remove the air box, and see if there is oil residue in the air inlet hose up high, near the check valve that is in the line going to the valve cover. The check valve is supposed to only let air into the crankcase. If it is bad it could allow oil to blow into the air stream. You may be able to just get the top part of the hose loose, and look in there without removing the air box.

Your compression numbers don't seem too bad, but depending on the tester, and procedure, it could potentially be bad rings. Try a wet test to see if the numbers improve.

I don't know how you would check for bad valve guides.

The PCV valve is internal, inside the intake manifold. No way to test it except to completely remove the intake manifold.

The turbo... yeah definitely could be. But just looking for oil in the charge piping is not conclusive, as it gets in there from the PCV system anyways, more so if you have worn rings.

Sisnce it's worse when decelerating from boosting, I suspect rings. This is a very strong vacuum condition. If rings are worn, lots of pressure builds in the crankcase, then when you let off the gas, the strong vacuum pulls all those vapors into the intake manifold. While boosting, some vapors are escaping through the secondary PCV line, dumping right into the mouth of the turbo. But that is very weak suction there.

But the turbo could be leaking oil into either the intake air stream, or directly into the exhaust air stream. I guess you could remove the turbo and hook up some oil lines and see if it leaks. Not sure how else to test it.

But yeah, try that wet compression test, let us know what you get.

 

If you were burning oil enough to see smoke while driving you should notice the oil level!

 

Not to get too side tracked but...
I was behind an old Saturn the other day in traffic and they had smoke coming from under their engine bay, and at every stop light they left a two foot wide puddle of oil......I wonder if they noticed LOL

 

Thanks guys now I have some things to check...Also note it smokes a lot on idle as well after it warms up around 180 degrees, but not when cold

 

I just got the car so its hard to check oil consumption at this time...

 

Well I pulled the lower charge pipe off of the passenger side intercooler and low and behold lots of motor oil with a side order of antifreeze! So there ya' have it...That is the best way to troubleshoot for a bad turbo! Hope this helps someone in the future!

 

Wish I had seen this sooner. I had all this happen to me. I think it started with the oil cooler leaking, and it gets sucked up and burned.

Mine had the same symptoms. We did a head gasket and a new turbo, but something (my oil cooler theory) was leaking still. Also at 140k miles, REPLACE the timing chains. There are two, and don't get talked into anything less.

My engine grenaded because of lost coolant and timing chain slippage at 75 mph. The worst sound you can hear. Nails on a chalkboard? Chicken**** compared to that at speed. Shot right to your heart.

I really miss my car.

 

Great thanks...It is the original turbo so it needs to be replaced anyways...Plus there is some antifreeze in the mix too...Head gasket, timing chain, tensioners, etc., were done 5K miles ago...I will research the oil cooler issue as well....