ISO 8217:2017 specifies the necessities for fuels to be used in marine diesel engines and boilers, prior to conventional onboard therapy (settling, centrifuging, filtration) earlier than use. The specs for fuels in this document may also be applied to fuels used in stationary diesel engines of the same or related kind as these used for marine functions. ISO 8217:2017 specifies seven categories of distillate fuels, one of which is for diesel engines used for emergency purposes. It additionally specifies six classes of residual fuels. For the purposes of this document, the term “fuels” is currently used to incorporate the following: – hydrocarbons from petroleum crude oil, oil sands and shale; – hydrocarbons from artificial or renewable sources, comparable in composition to petroleum distillate fuels; – blends of the above with a fatty acid methyl ester(s) (FAME) element where permitted. Word 1 Acceptable steering about fuel remedy methods for diesel engines is revealed by the International Council on Combustion Engines (CIMAC)[5]. Observe 2 Necessities for gasoline turbine fuels utilized in marine applications are specified in ISO 4261[6]. Notice three For the purposes of this document, the terms “mass %” and “volume %” are used to characterize the mass and volume fractions respectively.