In 2010 the EPA approved the use of E-15 claiming it was suitable for cars and light trucks built after 2001. Although approved in 2010, only one third of the states have adopted its use. Other states are introducing bills to pursue the “right to reject” the mandate and freeze Ethanol content at 10% – E-10.
If E-15 is used in marine engines, 2-stroke or 4-stroke, it burns too hot damaging valves and pistons – misfires and blows out gaskets. It has also been found to dissolve fuel lines. Periodic use of stabilizers will not change the reactions of E-15.
Many manufacturers of marine engines have warned damage caused by E-15 can and will void warranties. This caution may very