Oil Seperator, Burnt Oil Smell

[csoup50]

The other day I was driving home and it was very cold out, -14 degrees. I saw excess smoke coming out of the exhaust when I got home. I turned the car off and checked under the hood and their was oil surrounding the oil cap. I checked the oil for water because I was concerned it was a blown head gasket, and the oil had no water in it. I then read about the oil separator valve and the valve cover gaskets. I could smell the oil in the exhaust when it was running. So I spent about 5-6 Hours and I replaced the oil separator and both valve cover gaskets. When I was taking the valve covers off I noticed that the drivers side cover seemed to be the one that was leaking. As a side note It didn't seem as though very much oil was sitting on the spark plugs or in the bay area with the spark plugs. When I went to fire the X5 (4.4) back up it was still burning quite a bit of oil. Now this slowly went away (30 mins or so) and I have only put 150 miles on it since the repair. Before it was bellowing of burnt oil and now I can only catch a small hint of bunt oil via smell. My question is how long does it take for the oil smell to go away? Is their something else I could be missing? Also I had to replace the spark plugs because they seemed to be fouled from burning so much oil. Now it seems to be running pretty well. When the plugs were fouling I received a p1345 error code so that's what made me decide to replace the plugs.