I just changed the oil on my Raptor ran it for a while and shut it off. The next day I went to check it and it was barely on the hashes so I filled it up to full again and drove it around. About a week later I check it again and its barely on the dipstick. I do notice a little oil on the frame underneath the drain plug but the plug is tight. Why isnt the tank staying full??

 

Have you looked in the airbox?