Originally Posted by alloro

No, the PVC valve is at the top of the engine and has a splash guard under it. While it's possible for oil vapors to get into the PVC valve and cause build-up over 10s of thousand of miles, it's not going to suck down a quart every 1,000 miles. For you to lose a quart that often it's more likely worn valve guides and seals or worn piston rings.

Originally Posted by 1979bronco

alloro, What would be the easiest way to find out which one you mentioned. It is.