Oil Usage
Well there was so much build up it partially blocked up the cats so I took it to a guy that has a professional cleaning system made by Envirotech. He hooked it up and it took about 20 mins, also added a oil booster product to the oil, its a 2 oz bottle very thin that is supposed to get into everything. I also added about 3ozs of DEX6 to the oil.
At 1st it still idled a little rough cold but after 100 miles it idles completely smooth cold like it should and it hasn't used a drop of oil.
Sometimes in this cold weather I was adding a qt a week!.
I'm sure piston rings were pasted with carbon, these products cleaned all the carbon off and freed them. The car also gained some power it didn't have before.
So if you have stock LS1 with more than 40k on it that uses a lot of oil your rings my be that pasted up causing the problem.
I've run into this before but it was always a vacuum leak. I had a reliable mechanic replace the intake gaskets and I went over everything with him. There are no obvious vacuum leaks and the fuel trims are 0. Lifters are quiet and its runs great.
I'm thinking valve seals leaking oil cold fouling the plugs a little till it warms up. I think when I take it to get the oring changed i'm going to have the valve seals dome too.

