I disagree with oncedoen. A variable oil mixture means your engine runs cleaner and more efficiantly. When you have a constant oil misture in the fuel, it will smoke a lot at low revs and can possibly foul up. When you say it burning oil, how much. Because one oil tank should last 4 fuel tanks. The oil pump has a mechanical adjustment that cant move unless the lever was bent which doesnt happen. so what oil are you using, is it yamalube 2W?? if not and you are using something thicker it is likely to be clogging the power valves. It is important everone uses the recommended oil on newer model skis. It wasnt so important previously but is now.