New member – low oil question

My first post! I’ve own a 2002 Yamaha Grizzly 660 for just over a year now. I purchased it from my brother whom was always very meticulous about maintaining it (oil was changed just before purchase). I’ve put anywhere between 200 and 300 miles on it since I’ve owned it (no trailer until recently). So I start my oil change noticing no level on dipstick. I decided to measure the amount of oil drained and found it to be only 26oz! Now I have major concerns. Completed oil change with filter and filled to proper level. It seems to be running fine but I am obviously concern about the health of this machine. watching oil consumption now but not enough use to determine if its using oil or was just inadequate level from last oil change. Would appreciate any advice on how to proceed with this machine.