Vehicle is three years old. Never used the spare previously. Had a nail in the tire, so called Nissan Care to come and change it. Nissan Care arrived, used the spare that came with the vehicle and changed the tire. Immediately upon driving it, my wife heard weird noises, including grinding under her feet and grinding near the front right of the vehicle. Some knowledgeable car experts at her work told her she needs to get it checked out. She drove on it for less than 15 minutes before hearing a loud pop from the back, at which point the vehicle started smoking. She drove it to a nearby dealer. The dealer indicated the spare tire was not the same size as the others and because the vehicle has an intelligent all wheel drive system, this caused the rear differential to explode. Nissan RO # 6112906 is the reference number at Martin Nissan in Skokie, IL.