The most commonly recommended oil for use in a Zippo lighter is Zippo lighter fluid. This specialized fuel is designed to provide a consistent flame and is formulated to be safe and effective for use in Zippo lighters. The use of Zippo fuel is preferred over other types of oil due to its high volatility, which allows it to ignite quickly and burn cleanly. According to Zippo's official guidelines, their fuel is the only type that should be used in their lighters to ensure optimal performance and longevity.

The reason for this recommendation is rooted in the specific chemical composition of Zippo lighter fluid. It is a highly volatile, flammable liquid that is designed to vaporize quickly when exposed to air, which is essential for the ignition process in a Zippo lighter. The fuel contains a mixture of hydrocarbons that are optimized for the small flame needed to ignite the wick in the lighter. Using other oils, such as cooking oil or motor oil, can lead to a variety of issues, including a weaker flame, increased risk of fire due to lower volatility, and potential damage to the lighter's internal components.

Data from Zippo's official website and user forums support the use of Zippo fuel. For instance, a study by the Consumer Product Safety Commission (CPSC) found that using the correct fuel in a Zippo lighter can reduce the risk of fire-related incidents. Additionally, numerous user reviews and experiences confirm that using Zippo fuel results in a more reliable and longer-lasting flame. It is important to note that while Zippo fuel is the preferred choice, it should still be used with caution and stored properly to avoid accidents.