Does anyone know about Marriott fuel oil? Is it true?

It's true to some extent, but you can't believe what is said in TV advertisements.

The properties of fuel oil mainly depend on the properties and processing methods of crude oil. The main specifications that determine the quality of fuel oil include viscosity, sulfur content, pour point and other fuel oils for power plants, and the contents of vanadium and sodium are also stipulated.

Most petroleum products can be used as fuel, but fuel oil has different interpretations in different regions. The concept of European fuel oil generally refers to the black sticky residue left after crude oil distillation, or its mixture with lighter components, which is mainly used as fuel for steam boilers and various heating furnaces or as large slow diesel fuel and various industrial fuels. But in the United States, it refers to any flammable liquid or liquefied petroleum product with a flash point of not less than 37.8℃, which can be residual oil or heating oil. Fractional fuel oil can be obtained not only directly from crude oil distillation (that is, straight-run fraction), but also from other processing processes such as cracking and distillation.