Why did my oil get low

What is your question?

I bought a 2011 nissan sentra srv manual 6 speed only had 100,000 miles. Seemed real nice and well maintained. Plus i was sold this warranty package which i could use any time or any where if i have a problem. Well ive kept up on oil change. Did it at 5000 miles. Recently it seemed to be running a bit rough and i checked the oil it was very low.!! I didnt smell any burning or have spots in area i park . whats wrong?

What makes this problem better or worse?

I dont know

How long has your 2011 Nissan Sentra had this problem?

Not sure