Where is your PVC located. and is there a baffle under it? If oil is spraying directly on the PVC valve it will be sucked into the intake and burned.

If the it's not oil from an unbaffeled PVC valve, it could be worn out rings. An easy way to tell is with the engine running pull off the oil fill capn and pull and plug the PVC valve. Rev it to a high idle, if you have a bunch of oil smoke coming out of the oil fill the rings are shot.