Well, my 03 Concorde Limited has just over 100,000 miles, and if I recall correctly, 105,000 miles is the suggested mileage to replace the timing belt. Unless I trade for a van or suv shortly (going to need the space eventually), I figure I'd better get it replaced because I'd rather do that than have it break and competely toast the motor. The one place I've asked about it said it could cost close to $800 just to replace the belt. Is this accurate? And how hard is it to change yourself?