Gasoil

A middle distillate and form of heating oil used primarily in heating and air-conditioning systems. One of the most actively traded oil products, gasoil is the underlying in a key International Petroleum Exchange (IPE) futures contract. In refining terms, gasoil comes between fuel oil and the lighter products such as naphtha and gasoline. In its broader definition, it covers the oil products used for diesel automotive fuel and jet fuel.

Diesel fuel contains sulfur which derives from the original crude oil source and can still be present after refining. After combustion in the engine, the sulfur in fuel forms particulates that are a primary contributor to air pollution and the cause of harmful corrosion in the engine. Regulations to reduce vehicle emissions over the past several decades have dramatically reduced the allowable sulfur content in diesel fuel.