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I'm at a bit of a loss with my issue here after posting with some G8 specific groups, so I wanted to run this by you all.
Engine is a 6.0L in a G8 with about 70k miles. I just did a DOD delete and cam swap on this motor including replacing all the fun stuff that goes along with that. I haven't been able to put too many miles on it so far, but took her out last weekend and romped on it a bit. On my way home I noticed it seemed to stumble a bit when I got on it and then tons of blue smoke comes out the back. No codes, runs fine otherwise. I thought for sure I blew the motor but first thing I did was check my Elite Engineering E2 catch can and it was FULL of oil (not what you'd see from vapor, but looked like it came straight from the bottle). I just checked it maybe 100 miles prior and it was empty. So I was obviously pulling oil into the intake which was evident when I pulled off the TB and saw all the oil in there.
Here are a few variables that occurred when I did the DOD delete that affected the oiling system or PCV:
Went from a UPR catch can to Elite Engineering E2
Swapped to the revised drivers side valve cover with improved baffling. Confirmed there is a restriction orifice in the hose barb
Added a Melling 10296 oil pump with factory installed relief spring
Plugged the DOD pressure relief in the pan
Elite Engineering is at a bit of a loss as to the issue, and I honestly don't think it's the catch can.
My thought was that the 10296 pump is pumping more oil up to the rockers and is causing it to get sucked into the catch can. I logged oil pressure with my TorquePro app and no excessive pressure was noted.
Prior to the cam swap, with the UPR can, I'd get maybe a 1/4 of oil in it after 4k miles.
Cylinder walls were smooth and no excessive wear noted. I'm having a hard time believing this issue is related to rings or other internal engine issues since it was much more oil that I think you can attribute to blow by.
I am contemplating swapping to an LS3 valley cover, moving the catch can inlet to the PCV orifice on the LS3 valley cover and plugging the barb on the valve cover.
This is going to sound dumb/rudimentary but did you possibly add too much oil? Like an extra quart? I assume you checked your oil level after this happened.
This is going to sound dumb/rudimentary but did you possibly add too much oil? Like an extra quart? I assume you checked your oil level after this happened.
Valid question! I did check the oil level after and it was spot on.
That looks like clean oil in the can, not the slush that use to end up there. Might very well be the combination of the placement in the valvecover and the Melling high volume pump. I have the Mighty Mouse can but I draw from the valley cover, have ran it for about 800 miles with almost nothing in the can.
I also have the 10296.
That looks like clean oil in the can, not the slush that use to end up there. Might very well be the combination of the placement in the valvecover and the Melling high volume pump. I have the Mighty Mouse can but I draw from the valley cover, have ran it for about 800 miles with almost nothing in the can.
I also have the 10296.
Yeah it was definitely clean oil when I poured it out, looked like it was straight from the bottle.
I think that's the route I'm going to go then, with the LS3 valley cover and plug the valve cover port I've been using.
You don't think your other clean side valve cover has a restrictor thing in it too? So when you build pressure it is trying to squeeze out the 1/8 inch hole and it can't thus pushing oil from other valve cover. I run dual 3/8 hoses in to 1/2 inch hose to my air bridge up front.
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Excessive oil in catch can after DOD delete 
