replacing valve seals need some insight

[gearhead]

It may be piston rings. Most of your oil would be coming from intake side not exhaust side because of boost and positive pressure. i would take off intake manifold and look. If it is intake valve seals you will know. They will leak alot and you will get smoke if real bad. If its's piston rings the cylinder that has problem will have signs of oil all the way down where valves seal at head.