High Sulphur Marine Gasoil (HSMG) is a type of fuel commonly used in marine vessels and ships. It is characterized by its relatively high sulphur content, typically exceeding the limits set by international regulations. HSMG is derived from crude oil and undergoes refining processes to meet the specific requirements of marine engines. Despite its higher sulphur levels, HSMG remains a viable fuel option for certain maritime operations where compliance with lower sulphur fuel standards is not mandatory. Its usage is primarily found in regions or industries that have not fully transitioned to low-sulphur alternatives, such as older ships and certain non-Emission Control Areas (ECAs).