A 1.6. What precautions are needed for using ethanol-gasoline blends in older vehicles in countries where that practice is not usual?
There is no impediment to the use of ethanol-gasoline blends in older vehicles. However, deposits of gasoline in the fuel supply system are usually found in those cases. Therefore, when ethanol-gasoline blends are used for the first time in older vehicles, it is advisable to make at least the first two fuel filter replacements at shorter intervals than usually recommended. Since it is a property of ethanol to clean gasoline deposits, that practice prevents premature filter clogging and the resulting undesirable effects on engine operation. Although most of the materials that have been used in vehicles for many years are compatible with the anhydrous ethanol that is added to gasoline, it is advisable to periodically check the condition of gaskets, plastic materials and metallic components that are directly in contact with the fuel in order to ensure their integrity. It is important for the ethanol that is added to gasoline to be the anhydrous grade and to have the quality characteristic
