Eclipset4

I bought a new t3 and a t4 and both leaked oil after 10 miles from exhuast so I bolted the down pipes and it stop try that I also left my t4 alon with no spooling for a weak and it didt stop they say to crank ur car a couple times to oil them up but idk same issue and both my cars smoke white for some reason mabe o2 kuz iv took the motor apart everything on it has 10 miles don't understand also boost gauge won't read hks won't blow off waistgate won't open either
HELP!!!!!!!!