4g63 engine 6 bolt

I’m running into an issue with my car. I did a pressure test on the coolant system with the valve cover off (I took it off cause I was going to clean it sand it and basically repaint) so first I noticed my oil was milky when I checked my dip stick. I took off the oil cap and it’s milky there...

So I bought my galant 1 year ago and of course the car was broken and had a broken timing belt, after I fix the timing and new headgasket, valve job done, and resurface the head the car drove fine for a couple weeks and then it would randomly would over boost to more than 20 psi, the wasgate was...