The most common oil that can substitute for kerosene is fuel oil, also known as No. 2 diesel. Fuel oil has similar properties to kerosene, including a high flash point and low pour point, making it suitable for use in lamps, heaters, and other applications where kerosene is typically employed. According to the U.S. Energy Information Administration, fuel oil has a flash point ranging from 140°F to 200°F and a pour point of -40°F to -10°F, which aligns well with kerosene's specifications.

Fuel oil is widely available and can be found at most gas stations and home improvement stores, offering convenience for consumers. Additionally, it is cost-effective and has a longer shelf life compared to kerosene, which can degrade over time. The American Petroleum Institute (API) reports that fuel oil is a versatile fuel that can be used in a variety of heating systems, including furnaces, boilers, and stoves, making it a practical alternative for kerosene users.