Is fuel oil #2 diesel?

Yes, fuel oil #2 usually refers to diesel oil. No. 2 diesel oil is a distillate oil, with a viscosity range of 32.6 to 40.1 SUS at 37.7 degrees Celsius and an interfacial tension of 14.7 dynes/cm. In terms of chemical composition, it contains components such as paraffin (41.3%), monocycloalkanes (22.1%), dicycloalkanes (9.6%), tricycloalkanes (2.3%), and alkylbenzenes (5.9%). The total saturated hydrocarbons account for approximately 75.3%, and the total aromatic hydrocarbons account for about 24.7%. Diesel fuel is generally composed of a mixture of hydrocarbons from C10 to C19, with a composition similar to that of fuel oil #2. The main difference between the two usually stems from the additives used. In addition, No. 2 diesel oil needs to meet specific performance requirements in practical applications to ensure proper atomization and combustion efficiency in engines, adapting to the operational needs of diesel engines, and is one of the commonly used fuel types for diesel engines.