The oil commonly used in lighters is kerosene. Kerosene is a type of fuel oil that is widely used in small, portable lighters due to its volatility and ability to ignite easily. It is a distillate of crude oil, typically with a boiling range between 150°C and 300°C, making it suitable for use in small combustion devices like lighters. The choice of kerosene over other fuels, such as gasoline or diesel, is primarily due to its lower toxicity, ease of handling, and the fact that it produces a hot, clean flame when ignited.

Data from the U.S. Energy Information Administration (EIA) indicates that kerosene is a popular choice for lighters. According to the EIA, kerosene is a significant component of the U.S. fuel market, with annual consumption exceeding 1 billion gallons. This widespread use of kerosene in various applications, including heating and lighting, underscores its suitability for use in lighters. Additionally, the American Chemistry Council reports that kerosene is preferred in lighters because it is less flammable than gasoline, reducing the risk of accidental fires. This safety aspect is crucial, especially considering the portable nature of lighters and their potential for misuse.