The best oil to use in a Zippo lighter is Zippo lighter fluid. This specialized fuel is designed to ignite quickly and efficiently, ensuring reliable performance. Zippo lighter fluid is a highly volatile, flammable liquid that is specifically formulated for use in Zippo lighters. It contains a blend of hydrocarbons that provide the necessary energy for combustion.

The reason Zippo lighter fluid is the preferred choice is due to its high volatility, which allows it to vaporize quickly when exposed to the flame. This rapid vaporization ensures a consistent flame and easy ignition. Additionally, the fluid is designed to be safe for use in Zippo lighters, as it does not damage the internal components or cause rust. According to Zippo's official website, their lighter fluid is "100% safe for use in all Zippo lighters.

Data from Zippo's official website supports the use of their lighter fluid. The company states that their fluid is "the only fuel that Zippo recommends for use in Zippo lighters." This recommendation is based on extensive testing and the company's commitment to providing the best possible performance and safety for their customers. Using any other type of oil or fuel can lead to poor performance, damage to the lighter, and even safety hazards.