Burning Oil
 

I have a 03 Civic 1.7L. I have noticed that every month I have to add a quart of oil to the engine. Mainly if I do a lot of highway driving. I checked to see if the car was smoking but the exhaust was clear. I only use AMS oil, so the quality of the oil is not an issue. I changed the PVC valve thinking it was getting stuck. (This did not fix the problem)
I have nopower loss and no leaks.This is starting to confuse the heck out of me.