 During development of rocket engines in Germany during World War II J-2 Diesel fuel was used as the fuel component in several engines including the BMW 109-718.J-2 diesel fuel was also used as a fuel for gas turbine engines.Petroleum-derived diesel is composed of about 75% saturated hydrocarbons (primarily paraffins including "n", "iso", and cycloparaffins), and 25% aromatic hydrocarbons (including naphthalenes and alkylbenzenes).