Boat package values are established by organizations like NADA (National Automobile Dealers Association) based upon the model year of the boat. This is standard practice for automobiles, stern drive boat packages and many other applications since the engine is viewed as a component of the entire boat package. With boat values being based completely on the boat's model year, the elimination of model year on Evinrude outboard engines will not affect resale value. When an engine is traded in, the hours of use will determine the trade in value, as hours of use is the marine equivalent to mileage on an automobile.