I own a 2003 700 sportsman. Bought it new and I have had a problem trying to add antifreeze. Being so new I kept adding antifreeze. I checked my oil and found that the antifreeze was going in the oil. I only use this machine for small periods (taking garbage out, plowing driveway etc.) I have changed the oil and antifreeze several times, but I still get the same results, antifreeze in oil. This machine has done this since it was new. It runs great no smoke, no loss of power, just have to change oil often and of course add antifreeze. One thing I have noticed that the radiator cap does not tighten up, feels loose. Would like to fix this problem. From the posts I've read it sounds like a headgasket. I am now retired I have time to look into the problem.