Hello forum

I recently got a 2000 s40 and immediately ran into issues. I was leaking massive oil and eventually found our that it was the cam shaft seal. Replaced the seal. Problem solved......no. now I'm leaking oil on the rear of the engine, not sure from where exactly yet. Also throwing code for misfire in cylinder 4 (replaced the plug) and a vacuum leak.
I just tested the oil dipstick tube and it is poofing smoke, there is also oil on the valve cover. I just finished digging my way down to the oil trap, expecting it to be the culprit of my excessive crank case pressure, however the oil trap seems very clean, the block port are not clogged. Am I missing something? Maybe open valve? Vacuum leak causing all this?

Any help is mucho appreciated

Travis