If you get a puff of blue smoke at start up it could be valve seals. If you burn more oil on the highway or when accelerating it could be sticky piston rings. Below is why I say this.
Bought a 02 Camry cheap because it had a bad tick, burned a quart every 1500, and needed a new front cat to pass inspection. Puff of blue smoke at startup, burned more oil on the highway or when accelerating. Under the valve cover was a goopy sludgy mess. Using Mobil 1 High Mileage for a couple of OC's (recommended by BITOG members) dropped the oil consumption to 1/2 quart every 5k. Made a believer out of me. Now I run straight M1 5w-30. Would guess sticky rings were mainly responsible because the valve seals still puff at startup (not as bad). So you should try M1 High Mileage for 2 OC's, change the PCV valve, see what happens. As others have stated restore is an old school method of dealing with oil consumption - dont clean it, plug it up more.