Aniline point is a measure of the solvency of an aromatic hydrocarbon in a solvent. It is measured by adding aniline to the solvent and measuring the temperature at which it starts to dissolve. The aniline point is important for fuel treatment because it determines how well the fuel will be able to lubricate engine parts, how well it will release combustion and emission gases, and how resistant it is to oxidation. It also determines the fuel’s octane rating. The aniline point of gasoline is 183 °C or 364 °F.