This specification covers seven grades of diesel fuel oils suitable for various types of diesel engines. These grades are described as follows:

Grade No. 1-D S15 - A special purpose, light middle distillate fuel for use in diesel engine applications requiring a fuel with 15 ppm sulfur (maximum) and higher volatility than that provided by Grade No. 2-D S15 fuel.
Grade No. 1-D S500 - A special-purpose, light middle distillate fuel for use in diesel engine applications requiring a fuel with 500 ppm sulfur (maximum) and higher volatility than that provided by Grade No. 2-D S500 fuels.
Grade No. 1-D S5000 - A special-purpose, light middle distillate fuel for use in diesel engine applications requiring a fuel with 5000 ppm sulfur (maximum) and higher volatility than that provided by Grade No. 2-D S5000 fuels.
Grade No. 2-D S15 - A general purpose, middle distillate fuel fo ruse in diesel engine applications requiring a fuel with 15 ppm sulfur (maximum). It is especially suitable for use in applications with conditions of varying speed and load.
Grade No 2-D S500 - A general-purpose, middle distillate fuel for use in diesel engine applications requiring a fuel with 500 ppm sulfur (maximum). It is especially suitable for use in applications with conditions of varying speed and load.
Grade No 2-D S5000 - A general-purpose, middle distillate fuel for use in diesel engine applications requiring a fuel with 5000 ppm sulfur (maximum). It is especially suitable for use in applications with conditions of varying speed and load.
Grade No. 4-D - A heavy distillate fuel, or a blend of distillate and residual oil, for use in low- and medium-speed diesel engines in application involving predominatly constant speed and load