I won't even lie, I have never checked my oil levels on anything. I do 15k intervals on my Scion tC and mustang, and I check it when I do the next oil change. motorcycles I do like 5k or 4-5 year intervals. but I use amsoil, the oil for cars is rated 25k, but filter is only rated 15k so thats why I even change it then. I use amsoil signature series, pretty good stuff. Unless I have smoke, or its dripping under engine idk. never felt the need to check. I know how much I put in and runs great. lol I am lucky though, to have never experienced any failures but I trust my cars/bikes so until its time for servicing I expect them to have that much oil.