A 1.6. What special care is required in using ethanol-gasoline mixtures in older vehicles in countries where this practice is not common?
There is no obstacle to the use of ethanol-gasoline mixtures in older vehicles. However, in these vehicles it is common for there to be deposits left by gasoline in the fuel supply system. Therefore, when using ethanol-gasoline mixtures for the first time in older vehicles, it is recommended that the fuel filter be changed, at least twice, more frequently that normal. As ethanol has a cleaning property on gasoline deposits, this prevents premature blocking of the filter and its unwanted effects on the engines performance. Although most materials used in vehicles have for years been compatible with anhydrous ethanol used in the gasoline mixture, it is recommended that the state of rubber, plastic and metallic materials in direct contact with the fuel be checked regularly. It is important that ethanol mixed in gasoline be anhydrous and be of the quality appropriate for this use. When ethanol-gasoline mixtures are used it is common for product quality specifications to be adopted both for
