D2 is a refinery abbreviation for Gasoil. It is the second distillate from the crude, and can be used without reformers and additives.This is gas oil that is the second distillate that is obtained through the processing of crude oil. Reformers and additives are not required to make use of this fuel. The version of D2 that has lower sulr content is GOST 305-82 and it is the presentation of this to the market that has helped in a major reduction in pollution in many cities.