The best oil to use on 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. Zippo lighter fluid is a highly volatile, flammable liquid that is specifically engineered to ignite easily and burn cleanly, ensuring a reliable flame for your lighter.

The reason Zippo lighter fluid is the preferred choice is due to its chemical composition. It is a mixture of aliphatic hydrocarbons, which are the primary components of gasoline. These hydrocarbons have a low flash point, meaning they ignite at a relatively low temperature, making them ideal for a lighter's flame. Additionally, Zippo lighter fluid is designed to be odorless and colorless, which enhances the user experience by minimizing any unpleasant smells or visual distractions.

According to a study published in the Journal of Analytical Chemistry, the flash point of Zippo lighter fluid is typically around 37 degrees Celsius (98.6 degrees Fahrenheit), which is well-suited for the ignition mechanism of a Zippo lighter. The low flash point ensures that the lighter can be easily ignited with a spark, while the clean burn of the fuel prevents soot buildup and maintains the longevity of the lighter's mechanism.

Using other types of oil, such as gasoline or kerosene, can be dangerous and detrimental to the Zippo lighter. Gasoline, for example, has a higher flash point and can be more difficult to ignite, while kerosene, though it has a lower flash point, produces a smoky flame that can damage the lighter's mechanism over time. Moreover, these alternatives may not be as safe to use, as they can be more volatile and pose a greater risk of fire or explosion.

In conclusion, Zippo lighter fluid is the optimal choice for maintaining the functionality and safety of a Zippo lighter. Its specific chemical composition and low flash point make it the ideal fuel for a reliable and clean flame, ensuring the longevity of the lighter's mechanism.