I did a search and never did find just what I was looking for so I'll ask and see what I get. I have a 2004 WR450F and it's losing oil. No leaks, no noticeable smoke on fire up or that I can see riding but with a little over 100 miles on the street and about 15 off road it went from right on the full mark to barely touching the stick. When I got it it was really low on oil but since I didn't know really how often it got checked I let it slide. It's not huffing out the vent hose, not putting oil on the plug, least not enough to notice. Runs great, least I think it does. I'm checking the oil by the book and I've watched it creep down the stick since I changed the oil. Given no leaks it has to be burning it, just slowly enough to not be obvious smoke or plug fouling wise. I have no idea how long it's been since a rering and the guy I bought it from doesn't know either except that he never did one. How much oil loss is normal on one of these? If it's just normal I'll leave it alone but if it's rings time I'll just keep oil in it until this August when I take the dog days off from dirting. Then decide what atrocities I commit to the poor thing, muahahahahaha!!!! Thanks in advance!