Iyi mashini ikoreshwa mu gufunga igice cy'imbere cy'imashini ikora ku buryo butambitse n'imashini ikora ku buryo buhagaze. Ubwiza bw'ingenzi bw'iyi mashini ni uguhuza neza, imiterere yayo isobanutse neza, kandi ifite ubuziranenge bwinshi.