Diesel or Diesel fuel in general is any fuel used in diesel engines. The most common is a specific fractional distillate of petroleum fuel oil, but alternatives that are not derived from petroleum, such as biodiesel, biomass to liquid (BTL) or gas to liquid (GTL) diesel, are increasingly being developed and adopted.
D2 diesel, also called Gasoil, is a fuel oil that is the second distillate derived from crude oil. D2 diesel products contain different levels of Sulphur and require no reformers or additives to produce.D2 diesel fuel is the broad category for the second distillate of crude oil. Ultra-low Sulphur grades of D2, Sulphur content of 0.02 percent (maximum value) helps to Sulphur pollution emissions and is popular worldwide.