Is diesel and light oil the same thing?

Diesel and light oil are not the same, although they are related. Diesel fuel is a specific type of light oil derived from crude oil, designed for use in diesel engines. Light oil, on the other hand, refers to a broader category of petroleum products that includes various fractions of crude oil, such as gasoline and kerosene, in addition to diesel. Therefore, while all diesel is a type of light oil, not all light oil is diesel.