Vicious, dark, and heavy Fuel Oil (HFO), known as Mazut M100, is a form of commercial fuel primarily used for generating power in factories. In the United States and Europe, it is also used in diesel production, while in Russia and other Eastern countries, it serves as a heating fuel for homes. Mazut M100 is highly attractive to consumers due to its economical price, availability, and ease of refining from crude oil. This fuel is manufactured to GOST specifications.