Automotive Gas Oil (AGO) is also known as diesel because it is� a by-product of crude oil. It is gotten in the mid-boiling range of the crude oil refining process. AGO is a less flammable fuel compared to other petroleum products such as premium motor spirit. AGO is used in two main types of vehicles namely heavy-duty vehicles, such as trucks and buses and light-duty vehicles, such as vans and passenger cars. Both oil and natural gas are made up primarily of hydrocarbon (H), which is a chemical compound consisting entirely of carbon (C) and hydrogen (H). They can be classified further into a variety of types depending on the structure of molecules and how they are bound.