I just helped a friend who bought an old Heritage that had been sitting in a guys living room for many years. It only had 4200 miles on it, but we changed the fuel and air filters, plugs, all fluids (using Amsoil 20-50 and their Primary and Tranny specific oils, as that was what I had on hand), fresh tires and new battery. The damn thing started right up and has been running fine for him since the Fall! We were both pretty surprised, but hey - don’t argue with success! LOL