Chemical stability of commercial gasoline is characterized by breakdown time — the time from the beginning of test until the beginning of oxidation process. The longer the breakdown time, the higher gasoline stability to the oxidation is on long storage. The gasoline characterized by breakdown time of not less than 900 min. can keep the properties during the guaranteed storage life (5 years).
Motor gasoline should be chemically neutral and non-corroding. Corrosivity of gasoline and residues of its combustion depends on the content of the total and mercaptan sulphur, acidity, content of water-soluble acids and alkalis, and water.