Low oil level

My truck seems to be losing oil. I am unable to detect a leak of any sort so I assume I’m burning it somehow. I replaced the pcv valve about a month ago and that didn’t seem to work. The truck runs fine and there’s no dash warning light, despite losing about a quart of oil every month or 2. Anybody have any opinions on what my next step should be? Thanks guys

 

I would think a leak down test to confirm blow by would be in order. Before that I'd pull the spark plugs and inspect them. Look for oil in the plug wells and how fouled are the plugs.