I bought a 2015 570 sportsman last spring. I put less then 325 miles on last year. Changed the oil early this spring with the recommended oil and filter from Polaris. Put 80 miles on and my buddy riding behind me said he smelled oil. So we checked it and it was low. Added oil and checked it again after 40 miles once again it was low. Thinking it might be a ring issue?any thoughts?