Quote:
Originally Posted by sol
i did not know that gas effected older cars
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Ethanol is highly corrosive, which means it can degrade rubber and steel fuel lines that are not resistent to this effect, on top of having less energy per unit volume than pure gasoline. Most cars from the last decade or so are at least capable of handling E10, but at least the pre obdII cars seem to suffer worse from the lower energy content than newer cars which can compensate more by injecting even more fuel to compensate for the change in the stoiciometric air fuel ratio.
E15 would add an additional 5% ethanol by volume, which would further increase the risk of corrosion for older fuel systems, as well as knocking loose more crud which may plug the fuel filters.
It is not recommended to run E85 through a flex fuel vehicle if it has not been run regularly or the sudden change may cause fuel system damage, and at a minimum clogs the fuel filter.