* Damaged fuel lines and seals: Ethanol is corrosive and can degrade rubber and plastic components in the fuel system.
* Engine performance issues: E85 has lower energy density than gasoline, meaning you'll get less mileage and potentially experience rough running or stalling.
* Sensor malfunctions: Ethanol can affect the operation of various engine sensors.
Before considering alternative fuels like E85, always check your owner's manual. If it doesn't explicitly state compatibility, assume it's not safe.