The Zippo lighter uses a specific type of fuel oil to ignite its flame. This oil is a blend of naphtha and isoparaffin, which is a mixture of paraffin hydrocarbons. This blend is chosen for its volatility, meaning it evaporates quickly at room temperature, making it ideal for a lighter's fuel. The use of this particular blend ensures a consistent and reliable flame for the user. According to Zippo's official specifications, the fuel oil is designed to be safe and easy to ignite, providing a long-lasting flame that can withstand wind and other environmental factors. The choice of this fuel oil is based on extensive testing and development to ensure optimal performance and safety for the user.