No. 2 fuel oil is a type of petroleum product commonly used for heating and powering engines. It is a middle distillate, meaning it is derived from the refining process of crude oil. This fuel is often used in residential heating systems, commercial buildings, and industrial applications due to its efficiency and relatively low cost. In addition to heating, No. 2 fuel oil is also utilized in some types of diesel engines. It has a higher viscosity compared to lighter fuels, which makes it suitable for applications requiring a more robust energy source. Proper storage and handling are essential to prevent contamination and ensure optimal performance.